<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<select id="one" onchange="fn(this.value)">
<option value ="">——请选择——</option>
<option value ="0">江西省</option>
<option value ="1">广东省</option>
<option value ="2">河南省</option>
</select>
<select id="two">
<option value ="">——请选择——</option>
</select>
</body>
<script type="text/javascript">
var two=document.getElementById('two');
var city=[]
city[0]=["赣州市","南昌市","抚州市","九江市"]
city[1]=["广州市","佛山市","深圳市","珠海市"]
city[2]=["焦作市","开封市","驻马店","郑州市"]
function fn(n){
two.length=1;
console.log(n)
for(var i=0;i<city[n].length;i++){
var op=new Option(city[n][i]);
console.log(op);
two.appendChild(op)
}
}
</script>
</html>
js realizes secondary linkage small demo
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Origin blog.csdn.net/GongWei_/article/details/110442004
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