原生js实现二级联动菜单
本文实例为大家分享了js二级联动菜单的具体代码，供大家参考，具体内容如下
效果如下：
代码如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>二级联动菜单</title>
<style>
*{
padding: 0px;
margin: 0px;
}
form{
width: 300px;
height: 300px;
margin: 10px auto;
}
form select{
width: 140px;
height: 50px;
text-align: center;
line-height: 30px;
font-size: 20px;
}
</style>
<script>
var x = ["请选择...","美食","景点","电影"];
var y = [
["请选择..."],
["黄焖鸡","油焖大虾","红烧肉","东坡肉"],
["黄山","泰山","嵩山","华山"],
["烈日灼心","逆战","无间道","黑金"]
];
window.onload = init;
function init(){
var chose1 = document.getElementById("chose1");
var chose2 = document.getElementById("chose2");
chose1.length = x.length;
for(var i = 0;i<x.length;i++)
{
chose1.options[i].text = x[i];
}
var index = 0;
chose2.length = y[index].length;
for(var j = 0;j<y[index].length;j++)
{
chose2.options[j].text = y[index][j];
}
}
function change(obj){
var chose2 = document.getElementById("chose2");
chose2.length = y[obj].length;
for(var j = 0;j<y[obj].length;j++)
{
chose2.options[j].text = y[obj][j];
}
}
</script>
</head>
<body>
<form>
<select id="chose1" onchange="change(this.selectedIndex)"></select>
<select id="chose2"></select>
</form>
</body>
</html>
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