二级联
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
省份：
<select id="selPro">
<option>请选择省份</option>
</select>
<br /> 市：
<select id="selCity">
<option>请选择城市</option>
</select>
</body>
</html>
<script type="text/javascript">
//获取省份这个id
var selpro = document.getElementById("selPro");
//获取市这个ID
var selCity = document.getElementById("selCity");
//创建数组
var proArr = ["陕西", "河北", "湖南"]
var cityArr = [[],["安康市", "咸阳市", "西安市", "榆林"],["石家庄", "保定", "长廊"],["淳化", "长沙", "湘潭"]];
//触发事件
onload = function() {
for(i = 0; i < proArr.length; i++) {
//创建以option这个标签
var op1 = document.createElement("option");
//把省这个数组放到op1这个标签中标签
op1.innerHTML = proArr[i];
//添加子节点
selpro.appendChild(op1);
}
}
selpro.onchange= function(){
//清除每一次选择省是出现的是内容
selCity.length = 1;
//省份
var index = selpro.selectedIndex;
//城市
var city1 = cityArr[index];
for(var i in city1) {
var city = city1[i];
//创建标签节点
var cityOption = document.createElement("option");
cityOption.innerHTML = city;
selCity.appendChild(cityOption);
}
}
</script>
