abstrait：<!DOCTYPE html> <html> <head> <meta charset="UTF-8">
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>市區(qū)下拉聯(lián)動(dòng)</title>
<style>
div {
margin:200px auto;
width: 500px;
height: 90px;
border: 5px solid lightblue;
}
select {
width: 200px;
height: 30px;
margin-top: 30px;
margin-right: 10px;
padding-left:10px;
line-height: 30px;
}
</style>
<script>
var arr = [
['新城區(qū)', '賽罕區(qū)', '回民區(qū)', '玉泉區(qū)', '金橋開(kāi)發(fā)區(qū)', '如意開(kāi)發(fā)區(qū)', '金川開(kāi)發(fā)區(qū)'],
['東河區(qū)', '昆都侖區(qū)', '青山區(qū)', '九原區(qū)', '石拐區(qū)']
];
function clickOption() {
var SelectCS = document.getElementById("CS");
var val = SelectCS.value;
val = val - 1;
//清空區(qū)縣，便于第二次點(diǎn)擊，不然會(huì)一直添加
var SelectQX = document.getElementById("QX");
SelectQX.options.length = 0;
//遍歷數(shù)組，將數(shù)組中的元素添加到區(qū)縣節(jié)點(diǎn)
for (var i = 0; i < arr[val].length; i++) {
//創(chuàng)建節(jié)點(diǎn)
var opt = document.createElement("option");
//創(chuàng)建文本內(nèi)容
var Text = document.createTextNode(arr[val][i]);
opt.appendChild(Text);
SelectQX.appendChild(opt);
}
}
</script>
</head>
<body>
<center>
<div>
<select id="CS" onchange="clickOption()">
<option value="0">--請(qǐng)選擇--</option>
<option value="1">呼和浩特市</option>
<option value="2">包頭市</option>
</select>
<select id="QX">
<option>--請(qǐng)選擇--</option>
</select>
</div>
</center>
</body>
</html>
Professeur correcteur：滅絕師太Temps de correction：2019-01-31 14:35:56
Résumé du professeur：你在日期對(duì)象的作業(yè)里面給了我這個(gè)作業(yè)?是濫竽充數(shù)??