[toc]
一、input 输入控件，怎样提示其内容为空
1、文件上传控件
A、一种实现方法，案例
html 代码：
<input type="file" id="reportXML" name="reportXML" title="输入内容" multiple="multiple">
<button type="button" onclick="submitXML()">提交</button>
js 代码：
function submitXML(){
var fileInput = $('#reportXML').get(0).files[0];
console.info(fileInput);
if(fileInput) {
$("#reportXMLform").submit();
} else {
alert("请选择上传文件！");
}
}
B、案例2，在别的 btn-click 里面提交
html 代码如下
<form id="xx" method="post" action="proc.html">
<input type="file" id="reportXML" name="reportXML" title="输入内容" multiple="multiple">
</form>
js 如下
function submitXML(){
var fileInput = $('#reportXML').get(0).files[0];
console.info(fileInput);
if(fileInput) {
$("#xx").submit(); //这里利用的是<form>控件的submit功能
} else {
alert("请选择上传文件！");
}
}
2、普通文件框控件
js 代码：
function btnck() {
var a=document.getElementById("text");
var b=document.getElementById("btn");
if(a.value==""){
alert("文本框内容不能为空！");
} else {
alert("提交成功！");
}
}
html 代码
<input id="text" type="text" />
<input id="btn" type="button" onclick="btnck();" value="提交" />
二、按钮点击之后，3秒内不能再次点击
html 代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script type="text/javascript">
var date1 = new Date();
var date2 = new Date();
var data3 = new Date();
var count = 1;
function test() {
date1 = date2;
date2 = new Date();
if(count==1) {
count ++;
} else {
data3 = (date2.getTime()-date1.getTime())/1000;
}
if (data3 <3) {
alert("请不要太快添加");
} else {
alert("OK");
}
}
</script>
</head>
<body>
<input type="button" οnclick="test();" value="点我" >
</body>
</html>
三、js实现全国31省市级联下拉选择框核心代码
1、例一，讲述思路
<html>
<head>
<script>
//底层数据源
var pro=['黑龙江','吉林','辽宁'];
//次级数据源要使用二维数组
var city=[['哈尔滨','佳木斯','齐齐哈尔','大庆','鹤岗'],['长春','四平','松原','吉林'], ['铁岭','大连','沈阳']];
function init() {
loadpro();
loadCity();
}
//加载省级的选择函数
/*思路：在省级的select中加入option选项
*实现：找到provice选择框->创建option并加入select中
* ->加入数量内容（.innerHTML）由数据源决定(循环)
* ->先写入内容再添加到父级标签select中
*/
function loadpro() {
var provice = document.getElementById('provice');
for (var i = 0; i < pro.length; i++ ) {
var option=document.createElement('option')
option.innerHTML=pro[i]
provice.appendChild(option);
}
}
//加载城市的选择函数
/*思路：在所选省级下的select中加入option城市 *实现：确认当前选择省级（确认索引）：
1.找到省级的select中的值（value）
2.将当前值与第i个省级对比（确认索引)
加入城市数据源中的第i组数据option：
1.找到城市select
2.循环第i组数据加入（数量：二维长度） *注意：没选择一次要清空城市选择框中的内容 */
function loadCity() {
//找到select provi懈ce
var provice=document.getElementById('provice');
var c=document.getElementById('city');
c.innerHTML='';
for(var i=0;i<pro.length; i++) {
if(pro[i]==provice.value) {
var cs=city[i];
for(var j=0;j<cs.length;j++) {
var option = document.createElement('option');
option.innerHTML=cs[j];
c.appendChild(option);
}
}
}
}
//选择框
</script>
</head>
<body onload="init()">
<select id="provice" onchange="loadCity()">
</select>==<select id = "city"></select>
</body>
</html>
2、例二，一个完全可用的例子
A、源码如下
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>全国省份城市级联下拉菜单</title>
<script language="javascript">
cityareaname=new Array(35);
cityareacode=new Array(35);
function first(preP,preC,formname,selectP,selectC)
{
a=0;
if (selectP=='01') {
a=1;
tempoption = new Option('北京','01',false,true);
} else {
tempoption = new Option('北京','01');
}
eval('document.'+formname+'.'+preP+'.options[1]=tempoption;');
cityareacode[0]=new Array('0101','0102','0103','0104','0105','0106','0107','0108');
cityareaname[0]=new Array('东城区','西城区','崇文区','宣武区','朝阳区','海淀区','丰台区','石景山');
if (selectP=='02') {
a = 2;
tempoption = new Option('深圳','02',false,true);
} else {
tempoption = new Option('深圳','02');
}
eval('document.'+formname+'.'+preP+'.options[2]=tempoption;');
cityareacode[1]=new Array('0201','0202','0203','0204','0205','0206');
cityareaname[1]=new Array('罗湖','福田','南山','盐田','宝安','龙岗');
if (selectP=='03') {
a = 3;
tempoption = new Option('上海','03',false,true);
} else {
tempoption = new Option('上海','03');
}
eval('document.'+formname+'.'+preP+'.options[3]=tempoption;');
cityareacode[2] = new Array('0301','0302','0303','0304','0305','0306','0307','0308','0309','0310','0311','0312','0313','0314','0315','0316','0317','0318','0319','0320');
cityareaname[2]=new Array('宝山','金山','南市','长宁','静安','青浦','崇明','卢湾','松江','奉贤','浦东','杨浦','虹口','普陀','闸北','黄浦','闵行','徐汇','嘉定','南汇');
if (selectP=='04') {
a=4;tempoption=new Option('重庆','04',false,true);
} else {
tempoption = new Option('重庆','04');
}
eval('document.'+formname+'.'+preP+'.options[4]=tempoption;');
cityareacode[3]=new Array('0401','0402','0403','0404','0405','0406');
cityareaname[3]=new Array('渝中','江北','沙坪坝','南岸','九龙坡','大渡口');
if (selectP=='05') {
a = 5;
tempoption = new Option('天津','05',false,true);
} else {
tempoption = new Option('天津','05');
}
eval('document.'+formname+'.'+preP+'.options[5]=tempoption;');
cityareacode[4]=new Array('0501','0502','0503','0504','0505','0506','0507','0508','0509','0510','0511','0512','0513','0514','0515');
cityareaname[4]=new Array('和平','河北','河西','河东','南开','红桥','塘沽','汉沽','大港','东丽','西青','津南','北辰','武清','滨海');
if (selectP=='06') {
a = 6;tempoption=new Option('广东','06',false,true);
} else {
tempoption = new Option('广东','06');
}
eval('document.'+formname+'.'+preP+'.options[6]=tempoption;');
cityareacode[5]=new Array('0601','0602','0603','0604','0605','0606','0607','0608','0609','0610','0611','0612','0613','0614','0615');
cityareaname[5]=new Array('广州','珠海','中山','佛山','东莞','清远','肇庆','阳江','湛江','韶关','惠州','河源','汕尾','汕头','梅州');
if (selectP=='07') {
a = 7;
tempoption = new Option('河北','07',false,true);
} else {
tempoption = new Option('河北','07');
}
eval('document.'+formname+'.'+preP+'.options[7]=tempoption;');
cityareacode[6]=new Array('0701','0702','0703','0704','0705','0706','0707','0708','0709','0710','0711');
cityareaname[6]=new Array('石家庄','唐山','秦皇岛','邯郸','邢台','张家口','承德','廊坊','沧州','保定','衡水');
if (selectP=='08') {
a = 8;
tempoption=new Option('山西','08',false,true);
} else {
tempoption=new Option('山西','08');
}
eval('document.'+formname+'.'+preP+'.options[8]=tempoption;');
cityareacode[7]=new Array('0801','0802','0803','0804','0805','0806','0807');
cityareaname[7]=new Array('太原','大同','阳泉','朔州','长治','临汾','晋城');
if (selectP=='09') {
a = 9;
tempoption = new Option('内蒙古','09',false,true);
} else {
tempoption=new Option('内蒙古','09');
}
eval('document.'+formname+'.'+preP+'.options[9]=tempoption;');
cityareacode[8]=new Array('0901','0902','0903','0904','0905','0906','0907','0908','0909','0910','0911');
cityareaname[8]=new Array('呼和浩特','包头','乌海','临河','东胜','集宁','锡林浩特','通辽','赤峰','海拉尔','乌兰浩特');
if (selectP=='10') {
a=10;tempoption=new Option('辽宁','10',false,true);
} else {
tempoption=new Option('辽宁','10');
}
eval('document.'+formname+'.'+preP+'.options[10]=tempoption;');
cityareacode[9]=new Array('1001','1002','1003','1004','1005','1006','1007','1008','1009','1010','1011','1012','1013','1014');
cityareaname[9]=new Array('沈阳','大连','鞍山','锦州','丹东','盘锦','铁岭','抚顺','营口','辽阳','阜新','本溪','朝阳','葫芦岛');
if (selectP=='11') {
a=11;tempoption=new Option('吉林','11',false,true);
} else {
tempoption=new Option('吉林','11');
}
eval('document.'+formname+'.'+preP+'.options[11]=tempoption;');
cityareacode[10]=new Array('1101','1102','1103','1104','1105','1106','1107','1108','1109');
cityareaname[10]=new Array('长春','吉林','四平','辽源','通化','白山','松原','白城','延边');
if (selectP=='12') {
a=12;tempoption=new Option('黑龙江','12',false,true);
} else {
tempoption=new Option('黑龙江','12');
}
eval('document.'+formname+'.'+preP+'.options[12]=tempoption;');
cityareacode[11]=new Array('1201','1202','1203','1204','1205','1206','1207','1208','1209','1210','1211','1212','1213');
cityareaname[11]=new Array('哈尔滨','齐齐哈尔','牡丹江','佳木斯','大庆','伊春','黑河','鸡西','鹤岗','双鸭山','七台河','绥化','大兴安岭');
if (selectP=='13') {
a=13;tempoption=new Option('江苏','13',false,true);
} else {
tempoption=new Option('江苏','13');
}
eval('document.'+formname+'.'+preP+'.options[13]=tempoption;');
cityareacode[12]=new Array('1301','1302','1303','1304','1305','1306','1307','1308','1309','1310','1311','1312','1313');
cityareaname[12]=new Array('南京','苏州','无锡','常州','镇江','连云港 ','扬州','徐州 ','南通','盐城','淮阴','泰州','宿迁');
if (selectP=='14') {
a=14;tempoption=new Option('浙江','14',false,true);
} else {
tempoption=new Option('浙江','14');
}
eval('document.'+formname+'.'+preP+'.options[14]=tempoption;');
cityareacode[13]=new Array('1401','1402','1403','1404','1405','1406','1407','1408','1409','1410','1411');
cityareaname[13]=new Array('杭州','湖州','丽水','温州','绍兴','舟山','嘉兴','金华','台州','衢州','宁波');
if (selectP=='15') {
a=15;tempoption=new Option('安徽','15',false,true);
} else {
tempoption=new Option('安徽','15');
}
eval('document.'+formname+'.'+preP+'.options[15]=tempoption;');
cityareacode[14]=new Array('1501','1502','1503','1504','1505','1506','1507','1508','1509','1510','1511','1512','1513','1514','1515','1516','1517');
cityareaname[14]=new Array('合肥 ','芜湖 ','蚌埠 ','滁州 ','安庆 ','六安 ','黄山 ','宣城 ','淮南 ','宿州 ','马鞍山 ','铜陵','淮北 ','阜阳 ','池州 ','巢湖 ','亳州');
if (selectP=='16') {
a=16;tempoption=new Option('福建','16',false,true);
} else {
tempoption=new Option('福建','16');
}
eval('document.'+formname+'.'+preP+'.options[16]=tempoption;');
cityareacode[15]=new Array('1601','1602','1603','1604','1605','1606','1607','1608','1609');
cityareaname[15]=new Array('福州 ','厦门 ','泉州 ','漳州 ','龙岩 ','南平 ','宁德 ','莆田 ','三明');
if (selectP=='17') {
a = 17;tempoption=new Option('江西','17',false,true);
} else {
tempoption=new Option('江西','17');
}
eval('document.'+formname+'.'+preP+'.options[17]=tempoption;');
cityareacode[16]=new Array('1701','1702','1703','1704','1705','1706','1707','1708','1709','1710','1711');
cityareaname[16]=new Array('南昌','景德镇','九江','萍乡','新余','鹰潭','赣州','宜春','吉安','上饶','抚州');
if (selectP=='18') {
a=18;tempoption=new Option('山东','18',false,true);
} else {
tempoption=new Option('山东','18');
}
eval('document.'+formname+'.'+preP+'.options[18]=tempoption;');
cityareacode[17]=new Array('1801','1802','1803','1804','1805','1806','1807','1808','1809','1810','1811','1812','1813','1814','1815','1816','1817');
cityareaname[17]=new Array('济南','青岛','淄博','德州','烟台','潍坊','济宁','泰安','临沂','菏泽','威海','枣庄','日照','莱芜','聊城','滨州','东营');
if (selectP=='19') {
a=19;tempoption=new Option('河南','19',false,true);
} else {
tempoption=new Option('河南','19');
}
eval('document.'+formname+'.'+preP+'.options[19]=tempoption;');
cityareacode[18]=new Array('1901','1902','1903','1904','1905','1906','1907','1908','1909','1910','1911','1912','1913','1914','1915','1916','1917','1918');
cityareaname[18]=new Array('郑州','开封','洛阳','平顶山','安阳','鹤壁','新乡','焦作','濮阳','许昌','漯河','三门峡','南阳','商丘','周口','驻马店','信阳','济源');
if (selectP=='20') {
a=20;tempoption=new Option('湖北','20',false,true);
} else {
tempoption=new Option('湖北','20');
}
eval('document.'+formname+'.'+preP+'.options[20]=tempoption;');
cityareacode[19]=new Array('2001','2002','2003','2004','2005','2006','2007','2008','2009','2010','2011','2012','2013','2014','2015','2016','2017');
cityareaname[19]=new Array('武汉','黄石','十堰','荆州','宜昌','襄樊','鄂州','荆门','孝感','黄冈','咸宁','恩施','随州','仙桃','天门','潜江','神农架');
if (selectP=='21') {
a = 21;
tempoption = new Option('湖南','21',false,true);
} else {
tempoption=new Option('湖南','21');
}
eval('document.'+formname+'.'+preP+'.options[21]=tempoption;');
cityareacode[20]=new Array('2101','2102','2103','2104','2105','2106','2107','2108','2109','2110','2111','2112','2113');
cityareaname[20]=new Array('长沙','株州','湘潭','衡阳','邵阳','岳阳','常德','郴州','益阳','永州','怀化','娄底','湘西 ');
if (selectP=='22') {
a = 22;
tempoption=new Option('广西','22',false,true);
} else {
tempoption = new Option('广西','22');
}
eval('document.'+formname+'.'+preP+'.options[22]=tempoption;');
cityareacode[21]=new Array('2201','2202','2203','2204','2205','2206','2207','2208','2209','2210','2211','2212');
cityareaname[21]=new Array('南宁','柳州','桂林','梧州','北海','防城港','钦州','贵港','玉林','贺州','百色','河池');
if (selectP=='23') {
a = 23;
tempoption=new Option('海南','23',false,true);
} else {
tempoption=new Option('海南','23');
}
eval('document.'+formname+'.'+preP+'.options[23]=tempoption;');
cityareacode[22]=new Array('2301','2302','2303','2304','2305','2306','2307','2308','2309');
cityareaname[22]=new Array('海口 ','三亚','通什','琼海','琼山','文昌','万宁','东方','儋州');
if (selectP=='24') {
a = 24;
tempoption=new Option('四川','24',false,true);
} else {
tempoption=new Option('四川','24');
}
eval('document.'+formname+'.'+preP+'.options[24]=tempoption;');
cityareacode[23]=new Array('2401','2402','2403','2404','2405','2406','2407','2408','2409','2410','2411','2412','2413','2414','2415','2416','2417','2418','2419','2420');
cityareaname[23]=new Array('成都','自贡','攀枝花','泸州','德阳','绵阳','广元','遂宁','内江','乐山','南充 ','宜宾','广安','达川','巴中','雅安','眉山 ','阿坝 ','甘孜 ','凉山 ');
if (selectP=='25') {
a = 25;
tempoption=new Option('贵州','25',false,true);
} else {
tempoption=new Option('贵州','25');
}
eval('document.'+formname+'.'+preP+'.options[25]=tempoption;');
cityareacode[24]=new Array('2501','2502','2503','2504','2505','2506','2507','2508','2509');
cityareaname[24]=new Array('贵阳 ','六盘水','遵义','铜仁','毕节','安顺','黔西南 ','黔东南','黔南');
if (selectP=='26') {
a = 26;
tempoption = new Option('云南','26',false,true);
} else {
tempoption=new Option('云南','26');
}
eval('document.'+formname+'.'+preP+'.options[26]=tempoption;');
cityareacode[25]=new Array('2601','2602','2603','2604','2605','2606','2607','2608','2609','2610','2611','2612','2613','2614','2615','2616','2617');
cityareaname[25]=new Array('昆明','东川','曲靖','玉溪','昭通','思茅','临沧','保山','丽江','文山 ','红河 ','西双版纳 ','楚雄 ','大理 ','德宏 ','怒江','迪庆');
if (selectP=='27') {
a = 27;
tempoption = new Option('西藏','27',false,true);
} else {
tempoption = new Option('西藏','27');
}
eval('document.'+formname+'.'+preP+'.options[27]=tempoption;');
cityareacode[26]=new Array('2701','2702','2703','2704','2705','2706','2707');
cityareaname[26]=new Array('拉萨','那曲','昌都','山南','日喀则','阿里','林芝');
if (selectP=='28') {
a = 28;
tempoption=new Option('陕西','28',false,true);
} else {
tempoption=new Option('陕西','28');
}
eval('document.'+formname+'.'+preP+'.options[28]=tempoption;');
cityareacode[27]=new Array('2801','2802','2803','2804','2805','2806','2807','2808','2809','2810');
cityareaname[27]=new Array('西安','铜川','宝鸡','咸阳','渭南','延安','汉中','榆林','商洛','安康');
if (selectP=='29') {
a = 29;
tempoption=new Option('甘肃','29',false,true);
} else {
tempoption=new Option('甘肃','29');
}
eval('document.'+formname+'.'+preP+'.options[29]=tempoption;');
cityareacode[28]=new Array('2901','2902','2903','2904','2905','2906','2907','2908','2909','2910','2911','2912','2913','2914');
cityareaname[28]=new Array('兰州','金昌','白银','天水','嘉峪关','定西','平凉','庆阳','陇南','武威','张掖','酒泉','甘南 ','临夏');
if (selectP=='30') {
a = 30;
tempoption=new Option('青海','30',false,true);
} else {
tempoption=new Option('青海','30');
}
eval('document.'+formname+'.'+preP+'.options[30]=tempoption;');
cityareacode[29]=new Array('3001','3002','3003','3004','3005','3006','3007','3008');
cityareaname[29]=new Array('西宁','海东',' 海北 ','黄南','海南','果洛','玉树','海西');
if (selectP=='31') {
a = 31;
tempoption = new Option('宁夏','31',false,true);
} else {
tempoption=new Option('宁夏','31');
}
eval('document.'+formname+'.'+preP+'.options[31]=tempoption;');
cityareacode[30]=new Array('3101','3102','3103','3104');
cityareaname[30]=new Array('银川','石嘴山','银南','固原');
if (selectP=='32') {
a = 32;
tempoption=new Option('新疆','32',false,true);
} else {
tempoption=new Option('新疆','32');
}
eval('document.'+formname+'.'+preP+'.options[32]=tempoption;');
cityareacode[31]=new Array('3201','3202','3203','3204','3205','3206','3207','3208','3209','3210','3211','3212','3213');
cityareaname[31]=new Array('乌鲁木齐','克拉玛依','石河子','吐鲁番','哈密','和田','阿克苏','喀什','克孜勒苏','巴音郭楞','昌吉','博尔塔拉','伊犁');
if (selectP=='33') {
a = 33;
tempoption=new Option('香港','33',false,true);
} else {
tempoption=new Option('香港','33');
}
eval('document.'+formname+'.'+preP+'.options[33]=tempoption;');
cityareacode[32]=new Array();
cityareaname[32]=new Array();
if (selectP == '34') {
a = 34;
tempoption = new Option('澳门','34',false,true);
} else {
tempoption=new Option('澳门','34');
}
eval('document.'+formname+'.'+preP+'.options[34]=tempoption;');
cityareacode[33]=new Array();
cityareaname[33]=new Array();
if (selectP=='35') {
a = 35;
tempoption = new Option('台湾','35',false,true);
} else {
tempoption=new Option('台湾','35');
}
eval('document.'+formname+'.'+preP+'.options[35]=tempoption;');
cityareacode[34]=new Array();
cityareaname[34]=new Array();
eval('document.'+formname+'.'+preP+'.options[a].selected=true;');
cityid=selectP;
if (cityid!='0') {
b = 0 ;
for (i = 0; i < cityareaname[cityid-1].length; i++) {
if (selectC==cityareacode[cityid-1][i]) {
b = i+1;
tempoption=new Option(cityareaname[cityid-1][i],cityareacode[cityid-1][i],false,true);
} else {
tempoption=new Option(cityareaname[cityid-1][i],cityareacode[cityid-1][i]);
}
eval('document.'+formname+'.'+preC+'.options[i+1]=tempoption;');
}
eval('document.'+formname+'.'+preC+'.options[b].selected=true;');
}
}
function selectcityarea(preP,preC,formname) {
cityid=eval('document.'+formname+'.'+preP+'.selectedIndex;');
j = eval('document.'+formname+'.'+preC+'.length;');
for (i=1;i<j;i++) {
eval('document.'+formname+'.'+preC+'.options[j-i]=null;')
}
if (cityid!="0") {
for (i=0;i<cityareaname[cityid-1].length;i++) {
tempoption=new Option(cityareaname[cityid-1][i],cityareacode[cityid-1][i]);
eval('document.'+formname+'.'+preC+'.options[i+1]=tempoption;');
}
}
}
</script>
<form action="/procProvince" method="post or get" name="form1">
<label>省份：</label>
<select name="selectp" onchange="selectcityarea('selectp','selectc','form1');">
<option value="0" selected="">不限
</option>
</select>
<label>县/市：</label>
<select name="selectc">
<option value="0" selected="">不限
</option>
</select>
<input type="submit" value="确定" style=“width: 100px” />
</form>
<script language="javascript">
first("selectp","selectc","form1",0,0);
</script>
B、说明、解释，使用技巧
i、如果不加改造，用法是这样的
此代码虽然可以正常工作。
比如将它放在shttpd服务器的web目录下，访问127.0.0.1:port/xx.html 时，可以成功看到全国省市级联下拉框，能够完美工作。
点击确定按钮，能够向服务器发送两个值，把 method 设置为 get，这样可以在浏览器中看到发送的具体内容：selectp=03&selectc=0307
ii、默认用法的缺陷
1、采用独立文件，无法与其它功能集成在同一个界面显示
如果硬要采用 <iframe> 将它们嵌套在一起，那么当向后台发送请示后，后台回复的数据，只会显示在原来<iframe>所在区域，千万显示混乱
2、此段代码，量虽然大，绝大部分是js代码。
所以可以将其分割为 provinceSelect.js 和 provinceSelect.html 两个文件。
html部分因为内容不多，采用 shttpd_printf 打印出来也是可以的。
这样一来，在 shttpd C 源码中，就轻松包含了一个功能👍强大，而且完整的 html 代码。而 C 代码本身，还很小巧漂亮。
3、采用默认方法，向后台传送的是数字给编码 03为省，0307为市，具体表示什么需要在 C 中建立相应的数组，进行对比查询。
这实际是最具风险的事情，因为数组可能位置错位，造成很大的麻烦。而且建立全国省市数组，也是不小的工作量。
希望希望能够直接传输省市字符串到后台，后台收到后直接使用。如江苏连云港，后台的C代码不用对数字进行处理
iiii、解决办法
1、对于文件过大，不够灵活的问题，采用分割原文件为 proinceSelect.js 和 html 的方式解决
2、对于无法与其它控件在同一个页面显示问题，采用 shttpd_printf() 输出的方式来解决
3、对于后台不想接收数字，想接收字符串的问题
可以在原来的<form>中，再增加一个<input type="hidden" /> 控件，一旦用户点击了确定按钮，首先从两个下拉框中取出当前的省市值，赋值给隐藏控件的value，然后再调用<form>的submit函数，将它内部的所有控件值传给后台。
后台收到数据，直接跳过前面的两个数字，只提取隐藏控件中的值，即省市字符串。
综上所述，在shttpd中，需要添加的代码为
shttpd_printf(arg,"%s",
"<form id=\"allData\" action=\"\" method=\"get\" name=\"form1\"> "
"<fieldset><legend>省市</legend>"
"<label>省</label>"
"<select id=\"provinceSlect\" name=\"selectp\" onChange=\"selectcityarea('selectp','selectc','form1');\“ style=\"width:80px\" >"
" <option value=\"0\" selected>全国</option>"
"</select>"
"<label>市</label>"
"<select id=\"citySelect\" name=\"selectc\" style=\"width:80px;\" >"
" <option value=\"0\" selected>全省</option>
"</selected>"
"<label>运营商</label>"
"<select id=\"isp\" style=\"xxx\">"
" <option value=\"0\" selected>全部</option>"
"....三大运营商...."
"</selected>"
//这行是辅助传数据的控件，是关键技术
"<input type=\"hidden\" id=\"auxData\" value=\"\" />"
//这行增加一个手工输入框，为防止下拉框中内容不全
"<input type=\"text\" id=\"mannualInput\" name=\"manualInput\" placeholder=\"输入框提示请，请注意\" style=\"width:800px\" >"
"<input type=\"submit\" onclick=\"confirmSelect()\" value=\"确定查询\" style=\"width:100px\" />"
"</fieldset>"
"</form>"
)
4、为了将下拉框的值赋值给 <input>控件，需要如下代码
function confirmSelect() {
var province=$("#provinceSelect option:selected");
var cityText=$("#citySelect option:selected")
var ISP=$("#ISP option:selected")
//得到三个下拉框的值，将它们合并成一个字符串
var auxData=province.text()+','+cityText.text()+','+ISP.text();
//将合并后的值赋值给隐藏控件
$('#auxData').val(auxData);
//最后调用<form>的submit函数
$("#allData").submit();
}
四、js 怎样根据控件ID，定位它的位置
1、方法一：js原生方法
var oDiv = document.getElementById('divID');
alert(oDiv.getBoundingClientRect().left)
alert(oDiv.getBoundingClientRect().top)
2、方法二，为什么要这么费事
function getElementPos(elementId) {
var ua = navigator.userAgent.toLowerCase();
var isOpera = (ua.indexOf('opera') != -1);
var isIE = (ua.indexOf('msie') != -1 && !isOpera); // not opera spoof
var el = document.getElementById(elementId);
if (el.parentNode === null ||
el.style.display == 'none') {
return false;
}
var parent = null;
var pos = [];
var box;
if (el.getBoundingClientRect) //IE
{
box = el.getBoundingClientRect();
var scrollTop = Math.max(document.documentElement.scrollTop, document.body.scrollTop);
var scrollLeft = Math.max(document.documentElement.scrollLeft, document.body.scrollLeft);
return {
x: box.left + scrollLeft,
y: box.top + scrollTop
};
}
else if (document.getBoxObjectFor) //gecko
{
box = document.getBoxObjectFor(el);
var borderLeft = (el.style.borderLeftWidth) ? parseInt(el.style.borderLeftWidth) : 0;
var borderTop = (el.style.borderTopWidth) ? parseInt(el.style.borderTopWidth) : 0;
pos = [box.x - borderLeft, box.y - borderTop];
}
else // safari & opera
{
pos = [el.offsetLeft, el.offsetTop];
parent = el.offsetParent;
if (parent != el) {
while (parent) {
pos[0] += parent.offsetLeft;
pos[1] += parent.offsetTop;
parent = parent.offsetParent;
}
}
if (ua.indexOf('opera') != -1 ||
(ua.indexOf('safari') != -1 &&
el.style.position == 'absolute')) {
pos[0] -= document.body.offsetLeft;
pos[1] -= document.body.offsetTop;
}
}
if (el.parentNode) {
parent = el.parentNode;
} else {
parent = null;
}
while (parent &&
parent.tagName != 'BODY' && parent.tagName != 'HTML') { // account for any scrolled ancestors
pos[0] -= parent.scrollLeft;
pos[1] -= parent.scrollTop;
if (parent.parentNode) {
parent = parent.parentNode;
} else {
parent = null;
}
}
return {
x: pos[0],
y: pos[1]
};
}
3、一个应用，将鼠标放到表格某项时，弹出相关数据，要求内容跟随鼠标
根据上述函数，以控件ID获取其左上角坐标,然后在新位置弹出表格即可
实验代码如下，建立一个table，为某些单元格分配ID
再建立两个默认隐藏的table，当鼠标移到相关位置时，将其显示，但是需要更改其位置信息
<html>
<body>
<p>鼠标移动到该段落</p>
<table>
<tr><th>name</th><th>detail</th></tr>
<tr><td>zhou</td><td id="zhouMore">more</td></tr>
<tr><td>wang</td><td id="wangMore">more</td></tr>
</table>
<table id="zhouDescript" width="400px" border="3px"
cellspacing="0px" style="visibility:hidden">
<tr><th>province</th><th>city</th><th>country</th></tr>
<tr><td>jiangsu</td><td>lianyungang</td><td>china</td></tr>
</table>
<table id="wangDescript" width="400px" border="3px"
cellspacing="0px" style="visibility:hidden">
<tr><th>province</th><th>city</th><th>country</th></tr>
<tr><td>sichuan</td><td>chendu</td><td>china</td></tr>
</table>
</body>
</html>
为了达到鼠标挪到表格时，将隐藏表格显示出来，需要加入如下 js 代码进行处理
这段代码采用jQuery写成
$(document).ready(function(){
//$("p")表示对所有的<p>标签类型
$("p").hover( //这是一个基础代码，如果在函数开始加一名printf
function() { //这是将鼠标挪到P上时发生的事件
$("p").css("background-color", "yellow");
//document.write("<h1>this is a heading!</h1>");
},function(){//这是将鼠标挪走时，发生的事件
$("p").css("background-color", "pink");
})
//$("#zhouMore")表示对ID值zhouDescript的对象进行操作
$("#zhouMore").hover(
function(){
var basePos=getElementPos("zhouMore");
//鼠标挪过来之后，将关键区域颜色标红
$("#zhouMore").css("background-color", "pink");
$("#zhouDescript").css("position","absolute");
$("#zhouDescript").css(
{
"left":150 + "px",
"top":basePos.y + "px",
"color":"white",
"background-color":"#98bf21",
"font-family":"Arial",
"font-size":"20px",
"padding":"5px"
});
$("#zhouDescript").css("visibility","visible");
},function(){
$("#zhouMore").css("background-color":"white");
$("#zhouDescript").css("visibility","hidden");
}
)
$("#wangMore").hover(
function(){
var basePos=getElementPos("#wangMore");
$("#wangMore").css("background-color":"pink");
$("#wangDescript").css({
"position":"absolute",
"left":150 + "px",
"top":basePos.y + "px",
"color":"white",
"background-color":"#98bf21",
"font-family":"Arial",
"font-size":"20px",
"padding":"5px"
})
$("#wangDescript").css("visibility","visible");
},function(){
$("#wangMore").css("background-color","white");
$("#wangMore").css("visibility":"hidden");
});
});
4、感慨
当时想用这个功能的时候，引入一个bug。
折腾了一天，都没有查出来，最终只得放弃。
今日手工誊写，一眼看出故障所在。
五、js + html 实现简易考试系统(https://blog.csdn.net/asdfzjs/article/details/38386119)
1、第一种
<html>
<head>
<meta http-equiv="Content-Language" mrc="zh-cn">
<meta http-equiv="Content-Type" mrc="text/html; charset=gb2312">
<title>JavaScript在线考试系统</title>
</head>
<body>
<SCRIPT LANGUAGE="JavaScript">
<!--
function scorequiz(form) { var list=0 if(form.Q1.value!=null && form.Q1.value=="*") {list=list+10} if(form.Q2.value!=null && form.Q2.value=="*") {list=list+10} if(form.Q3.value!=null && form.Q3.value=="*") {list=list+10} if(form.Q4.value!=null && form.Q4.value=="*") {list=list+10} if(form.Q5.value!=null && form.Q5.value=="*") {list=list+10} if(form.Q6.value!=null && form.Q6.value=="*") {list=list+10} if(form.Q7.value!=null && form.Q7.value=="*") {list=list+10} if(form.Q8.value!=null && form.Q8.value=="*") {list=list+10} if(form.Q9.value!=null && form.Q9.value=="*") {list=list+10} if(form.Q10.value!=null && form.Q10.value=="*") {list=list+10} //alert(list); form.SCORE.value =eval(list) if (form.SCORE.value<=80){
ok="加油呀，你这次不及格哦！"
alert(ok)}
}
function clearquiz(form) { var list=0 form.Q1.value="?" form.Q2.value="?" form.Q3.value="?" form.Q4.value="?" form.Q5.value="?" form.Q6.value="?" form.Q7.value="?" form.Q8.value="?" form.Q9.value="?" form.Q10.value="?" form.SCORE.value =eval(list)
}
function msg() { alert("您的成绩将E-mail给相关人员。") }
// -->
</SCRIPT>
<body>
<table width="75%" border="0" align="center"> <tr> <td> <form name="quiz1" action ="mailto:www.baidu.com@163.com" method="post" enctype="text/plain" onLoad="clearquiz(this.form)" onSubmit="msg()"> 您的姓名: <input type="Text" name="Name" value="" class="pt9"> <hr> 1. Internet上使用的网络协议是：__________ <ol> <input type="radio" name="Q1" value="*TCP/IP" onClick=Q1.value="*"> TCP/IP <input type="radio" name="Q1" value="X.25" onClick=Q1.value="X.25"> X.25 <input type="radio" name="Q1" value="NetBEUI" onClick=Q1.value="NetBEUI"> NetBEUI </ol> 2. 我们通过__________长距离连接两台计算机使它们通讯。 <ol> <input type="radio" name="Q2" value="LAN" onClick=Q2.value="A"> LAN <input type="radio" name="Q2" value="*WAN" onClick=Q2.value="*"> WAN <input type="radio" name="Q2" value="WAIS" onClick=Q2.value="C"> WAIS </ol> 3. HUB是指：__________ <ol> <input type="radio" name="Q3" value="网关" onClick=Q3.value="网关"> 网关 <input type="radio" name="Q3" value="网桥" onClick=Q3.value="网桥"> 网桥 <input type="radio" name="Q3" value="路由器" onClick=Q3.value="路由器"> 路由器 <input type="radio" name="Q3" value="*集线器" onClick=Q3.value="*"> 集线器 </ol> 4. 56K MODEM的传输速度为：__________ <ol> <input type="radio" name="Q4" value="56Kbytes" onClick=Q4.value="A"> 每秒传输56K bytes的数据。 <input type="radio" name="Q4" value="*56kbps" onClick=Q4.value="*"> 每秒传输56k bits的数据。 </ol> 5. Gateway是指：__________ <ol> <input type="radio" name="Q5" value="*网关" onClick=Q5.value="*"> 网关 <input type="radio" name="Q5" value="网桥" onClick=Q5.value="B"> 网桥 <input type="radio" name="Q5" value="路由器" onClick=Q5.value="C"> 路由器 <input type="radio" name="Q5" value="集线器" onClick=Q5.value="D"> 集线器 </ol> 6. Http默认的端口是：__________ <ol> <input type="radio" name="Q6" value="8080" onClick=Q6.value="A"> 8080 <input type="radio" name="Q6" value="*80" onClick=Q6.value="*"> 80 <input type="radio" name="Q6" value="25" onClick=Q6.value="25"> 25 </ol> 7. JavaScript是一种类似于C++的语言，比较难掌握：__________ <ol> <input type="radio" name="Q7" value="True" onClick=Q7.value="T"> True <input type="radio" name="Q7" value="*False" onClick=Q7.value="*"> False </ol> 8. JAVA是 __________ 公司的产品： <ol> <input type="radio" name="Q8" value="Microsoft" onClick=Q8.value="A"> Microsoft <input type="radio" name="Q8" value="Novell" onClick=Q8.value="B"> Novell <input type="radio" name="Q8" value="*SUN" onClick=Q8.value="*"> SUN </ol> 9. CGI通过__________收集用户填写的表单信息： <ol> <input type="radio" name="Q9" value="Form" onClick=Q9.value="A"> Form <input type="radio" name="Q9" value="*环境变量" onClick=Q9.value="*"> 环境变量 <input type="radio" name="Q9" value="javascripts脚本" onClick=Q9.value="C"> javascripts脚本 </ol> 10. 服务器响应"404 error"的含义是： __________ <ol> <input type="radio" name="Q10" value="*文件不存在" onClick=Q10.value="*"> 文件不存在 <input type="radio" name="Q10" value="Server error" onClick=Q10.value="B"> 服务器错误 <input type="radio" name="Q10" value="Client error" onClick=Q10.value="C"> 浏览器错误 </ol> <hr> <input type="button" name="submit" value="开始评分" onClick=scorequiz(this.form) class="pt9"> <input type="reset" name="reset" value="重新测试" onClick=clearquiz(this.form) class="pt9"> <input type="submit" value="将成绩MAIL给管理员" onClick=scorequiz(this.form) name="submit" class="pt9"> 你的考试成绩： <input name="SCORE" type="text" class="pt9"> </form>
</body>
</html>
2、第二种(全是单选题，从网站原文复制，只是减少了题目)
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>在线考试系统</title>
<style type="text/css">
*{padding:0;margin:0;}
body{
font-size:14px;
background-color:#F9FCFD;
}
.highlight{ background-color:#FCFFD7;}
.selected{background-color:#FFEBD7;}
.div_topic{
padding:10px;
border:#73AFD0 dashed;
border-width: 0 0 1px 0;
background-color:#F9FCFD;
}
.div_topic.odd{background-color: #E0EEF5;}
.div_topic h4{
font-size:16px;
color:#22536A;
display:block;
padding:3px;
}
.div_topic p{
display:block;
padding:3px;
}
.div_topic h4 span{
padding:0 0 0 20px;
color:#FF0000;
display:none;
}
#fixedLayer {
width:100%;
background-color: #A3CBE0;
border:1px solid #73AFD0;
position:fixed;
left:0px;
top:0px;
}
#answer_last {
width:150px;
padding:10px;
background-color:#FFCC00;
border:1px dashed #888313;
position:fixed;
right:0px;
top:42px;
display:none;
}
#fixedLayer div{
padding:10px;
}
#topic_num{
width:30px;
text-align:center;
}
#topic_right{
float:right;
}
#status{
color:#FF0000;
font-size:14;
font-weight:bold;}
/*打印时，背景为白色*/
@media print{
body{
font-size:12px;
background-color:#fff;
}
.div_topic{
padding:5px;
border:#000 dashed;
border-width: 0 0 1px 0;
background-color:#fff;
}
.div_topic h4{
font-size:14px;
color:#000;
}
.div_topic h4 span{ display:none}
#answer_last {
background-color:#eee;
border:1px dashed #333;
color:#000000;
display:block;
position: static;
width:auto;
height:auto;
}
}
</style>
<!--[if IE]>
<style type="text/css">
html {height:100%;overflow:hidden;}
body {height:100%;overflow:auto;}
#fixedLayer{position:absolute;}
#answer_last{position:absolute;}
</style>
<![endif]-->
<script>
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var arr_topic = [
[
'中国省会:是:(_____)。',
[
['南京','no'],
['北京','yes'],
['长安','no'],
['洛阳','no']
]],
[
'花城:是:(_____)。',
[
['昆明','no'],
['广州','yes'],
['武汉','no'],
['哈尔宾','no']
]],
['2020年日本科技实力全球排名前五。',
[
['正确','yes'],
['错误','no']
]]
];
//元素的隐藏与呈现
function showHide(obj){
var obj=document.getElementById(obj);
obj.style.display=obj.style.display=="block"?"none":"block";
}
//初始化事件绑定
function int(){
$("#status").html("");
$('.div_topic').removeClass('odd');
$('.div_topic:even').addClass('odd');
$('.div_topic p').click(function(){
if($(this).find('input[type="radio"]').val() != undefined){
$(this).find('input[type="radio"]').attr('checked','checked');
var name = $(this).find('input[type="radio"]').attr('name');//获得名称
$('input[type="radio"][name="' + name + '"]').parents("p").removeClass('selected');
$('input[type="radio"][name="' + name + '"]:checked').parents("p").addClass('selected');
}
});
$("#check_answer").click(function(){
$("#status").html("");
$("h4").css("color","#22536A");
var answer_this_tip,set_answer,_temp_tip;
_temp_tip = "yes";
var tall = 0;
$(".div_topic").each(function(i){
if($(this).find('input[type="radio"]:checked').val() == undefined){
_temp_tip = "no";
$(this).find("h4").css("color","green");
}
tall++;
});
if(_temp_tip == "no"){
$("#status").html("还有题目没完成！");
return;
}
var err = 0;
$(".div_topic").each(function(i){
answer_this_tip = $(this).find(".answer_this_tip").html();
set_answer = $(this).find('input[type="radio"]:checked').val();
//$(this).find('input[type="radio"]').val() != undefined
if(answer_this_tip != set_answer){
$(this).find("h4").css("color","red");
err++;
}
});
$("h4 span").show();
$("#status").html("错误：" + err + "个！错误率：" + (err / tall * 100).toFixed(2) + "%");
});
}
function set_str_len(str,len){
str = str + "";
var temp = "";
for(i = 0; i < (len - str.length); i++){
temp += "0";
}
return temp + str;
}
//随即返回一个范围的随机数
function Grandom(m,n){
return Math.round(Math.random() * (n - m) + m);
}
function get_topic(_arr_topic,_topic_num){
var _all_num, //总题目数
_this_num, //总题随即一个数
_topic, //题目
_topic_temp, //临时题目
_topic_str, //题目字符串
i, //当前题目数
_arr_answer, //答案数组
_arr_answer_length, //答案长度
_this_answer_num, //答案随即一个数
_temp_answer, //临时答案
_arr_answer_last, //最终答案数列
_answer_last_str,//最终答案字符串
_answer_str, //答案字符串
_answer_tip, //答案前头的ABCD
_answer_this_tip,//当前题目的答案
_arr_answer_type;
_all_num = _arr_topic.length; //总题目数
_arr_answer_last = new Array();//最终答案数列
_topic_str = "";
for(y = 0; y < _topic_num; y++){
i = y + 1; //当前题目数
_this_num = Grandom(0,(_arr_topic.length - 1)); //随即一个数
_topic_temp = _arr_topic.splice(_this_num,1);
_topic = _topic_temp[0][0]; //题目
_arr_answer = _topic_temp[0][1];//答案数组
_arr_answer_length = _arr_answer.length; //答案长度
//获得答案字符串 begin _answer_str _answer_this_tip
_answer_str = "";
if(_arr_answer_length == 4){
for(j = 0; j < 4; j++){
try{
_this_answer_num = Grandom(0,(_arr_answer.length - 1));
_temp_answer = _arr_answer.splice(_this_answer_num,1);
switch (j) {
case 0 :
_answer_tip = "A";break;
case 1 :
_answer_tip = "B";break;
case 2 :
_answer_tip = "C";break;
case 3 :
_answer_tip = "D";break;
}
if(_temp_answer[0][1] == "yes"){
_answer_this_tip = _answer_tip;
}
_answer_str += '<input name="topic' + i + '" type="radio" value="' + _answer_tip + '">' + _answer_tip + '、' + _temp_answer[0][0] + '</p>';
}catch(e){
alert(e);
}
}
}else{
try{
if(_arr_answer[0][1] == "yes"){_answer_this_tip = "A";}
if(_arr_answer[1][1] == "yes"){_answer_this_tip = "B";}
_answer_str = '<p><input name="topic' + i + '" type="radio" value="A">A、' + _arr_answer[0][0] + '
<p><input name="topic' + i + '" type="radio" value="B">B、' + _arr_answer[1][0] + '</p>';
}catch(e){
alert(e);
}
}
_arr_answer_last.push(_answer_this_tip);
//获得答案字符串 end
//组合题目字符串 begin
_topic_str = '<div id="topic' + i + '" class="div_topic"><h4>' + i + '、' + _topic + '<span>答案：<span class="answer_this_tip">' + _answer_this_tip + '</span></span></h4>' + _answer_str + '</div>';
$(_topic_str).appendTo("#topic_all");
//组合题目字符串 end
}
//组合last答案字符串 begin _arr_answer_last _answer_last_str
var _answer_last_str = "";
var tap10 = 1;
var _answer_all_num = _arr_answer_last.length;
for(z = 0; z < _answer_all_num; z++){
y = z + 1;
if(y == 1){
if(_answer_all_num == 1){
_answer_last_str = '<p>001'
_answer_last_str += ' <b>'
}else{
_answer_last_str = '<p>001-';
if(_answer_all_num <= 10){
_answer_last_str += set_str_len(_answer_all_num,3) + ' <b>';
}else{
_answer_last_str += '010 <b>';
}
}
}
if(y%10 == 0){
if(_answer_all_num > 10 && y < _answer_all_num){
_answer_last_str += '</b></p>\n';
_answer_last_str += '<p>' + set_str_len((tap10 * 10 + 1),3);
if((tap10 * 10 + 1) == _answer_all_num){
_answer_last_str += ' <b>'
}else if(_answer_all_num < ((tap10 + 1) * 10)){
_answer_last_str += '-' + set_str_len(_answer_all_num,3) + ' <b>';
}else{
_answer_last_str += '-' + set_str_len(((tap10 + 1) * 10),3) + ' <b>';
tap10++;
}
}
}else if(y%5 == 0){
_answer_last_str += _arr_answer_last[z] + " ";
}else{
_answer_last_str += _arr_answer_last[z];
}
}
_answer_last_str += '</b></p>\n';
$("#answer_last").html("");
$("#answer_last").hide();
//组合last答案字符串 end
$("#answer_last").html(_answer_last_str);
}
$(document).ready(function(){
$("#topic_all_num").html(arr_topic.length);
$("#get_topic").click(function(){
$("#status").html("");
if($("#topic_all").html() != ""){
if(!confirm("是否要重新出题？")){
return;
}else{
$("#topic_all").html("");
}
}
var topic_num = $("#topic_num").val();
if(isNaN(topic_num)){
$("#topic_num").val("100");
}else{
if(topic_num <= 0){
$("#topic_num").val("100");
}
if(topic_num > arr_topic.length){
$("#topic_num").val(arr_topic.length);
}
}
topic_num = $("#topic_num").val();
get_topic(arr_topic,topic_num);
int();
});
});
</script>
</head>
<body>
<div id="fixedLayer"><div>
<p><span id="topic_right">
<input name="show_answer" id="show_answer" type="button" value=" 答案 " οnclick='$("#answer_last").toggle();'/>
<input name="check_answer" id="check_answer" type="button" value=" 算分 "/></span>
您的题库一共有<span id="topic_all_num"></span>道题，您要做其中<input name="topic_num" type="text" id="topic_num" value="100" />道。<input name="get_topic" id="get_topic" type="button" value=" 出 题 "/> <span id="status"></span></p>
</div>
</div>
<br/>
<br/>
<br/>
<div id="topic_all"></div>
<div id="answer_last"></div>
</body>
</html><br /><center>如不能显示效果，请按Ctrl+F5刷新本页，更多网页代码：<a href='http://www.veryhuo.com/' target='_blank' rel="noopener">http://www.veryhuo.com/</a></center>
3、第三种，由2改造而来，全是多选题
Ａ、改造方案
1、将文中radio都替换成功checkbox，除了一大段js库中的关键字例外。
2、将初始化函数名改为init()
3、打开网页后，默认要考100道题目，实际只有25道，逻辑混乱
修改：
A、在 $(document).ready()函数开头加一行
$("#topic_num").val(arr_topic.length)
B、将 var topic_num=$("#topic_num").val()及其后一段都删除
4、多选题构造是，记录标准答案
修改：
原来是单选题，现在是多选
if(_temp_answer[0][1]) == "yes"){
_anser_this_tip = _answer_tip;
}
==>
if(_temp_answer[0][1] == "yes"){
if (_answer_this_tip == undefined){
_answer_this_tip = _answer_tip;
} else {
_answer_this_tip += '.' + _answer_tip;
}
}
同时在中此函数开头，加初始化语句
_answer_this_tip = undefined;
5、多选题提交试卷时，统计分数，需要修改。
修改：
原来获取用户答案的语句
set_answer=$(this).find('input[type="checkbox"]:checked').val()
现在要改成多个答案
set_answer = undefined;
$(this).find('input[type="checkbox"]:checked').each(function(){
if (set_answer == undefined){
set_answer = $(this).val();
} else {
set_answer += '.' + $(this).val();
}
})
6、原来只支持4个答案，现在要支持任意个数
修改：
if(_arr_answer_length==4){
for (j=0;j<4; j++){
try{
xxx
switch(j){
case 0:
case 1:
case 2:
case 3:
}
}
}
}
这一段改为
两层循环变成一层，不用写死4，内部答案可以最多7个，到'H':
for (j=0;j<_arr_answer_length; j++){}
同事，将少于4个选项的异常 else 注释掉
7、将多选改为支持任意数量选项的选择题
switch 语句用来选择当前选项，太麻烦，改用数组
在函数 function get_topic(_arr_topic,_topic_num) 中增加数组定义
_answer_this_tip,//当前题目的答案
_topic_array = [ 'A', 'B', 'C', 'D', 'E', 'F', 'G',
'H', 'I', 'J', 'K', 'L', 'M', 'N',
'O', 'P', 'Q', 'R', 'S', 'T', 'U',
'V', 'W', 'X', 'Y', 'Z' ],
然后将 switch语句中的赋值注掉，改成如下语句：
_answer_tip = _topic_array[j];
８、因为本套试题，每次出题的题目顺序都是随机的，而且每个题目的答案也随机，将其改为固定顺序
Ａ、修改出题顺序为固定
在函数 function get_topic()中，找到 _arr_topic.splice(_this_num,1);
将_this_num相关的三行都去掉，换成_topic_temp = _arr_topic.splice(0,1);
原来是从题目中随机抽一个，现在都是从第一个开始抽取，抽取完删除原数组内容
Ｂ、修改一个题目答案顺序为固定
搜索 _arr_answer.splice(_this_answer_num,1);
将相关的两行注释掉：
//_this_answer_num = Grandom(0,(_arr_answer.length - 1));
//_temp_answer = _arr_answer.splice(_this_answer_num,1);
替换成：
_temp_answer = _arr_answer.splice(0,1);
表示从第一个选项开始显示
９、无法更改答案的问题