摘要：<!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>市区下拉联动</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 = [
['新城区', '赛罕区', '回民区', '玉泉区', '金桥开发区', '如意开发区', '金川开发区'],
['东河区', '昆都仑区', '青山区', '九原区', '石拐区']
];
function clickOption() {
var SelectCS = document.getElementById("CS");
var val = SelectCS.value;
val = val - 1;
//清空区县，便于第二次点击，不然会一直添加
var SelectQX = document.getElementById("QX");
SelectQX.options.length = 0;
//遍历数组，将数组中的元素添加到区县节点
for (var i = 0; i < arr[val].length; i++) {
//创建节点
var opt = document.createElement("option");
//创建文本内容
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">--请选择--</option>
<option value="1">呼和浩特市</option>
<option value="2">包头市</option>
</select>
<select id="QX">
<option>--请选择--</option>
</select>
</div>
</center>
</body>
</html>
批改老师：灭绝师太批改时间：2019-01-31 14:35:56
老师总结：你在日期对象的作业里面给了我这个作业?是滥竽充数??
