js实现菜单二级联动

代码如下，以便自己以后方便查阅：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

<title>菜单二级联动效果</title>

</head>

<body>

<script language="JavaScript" type="text/javascript">

/*var city=[

    ["北京","天津","上海","重庆"],

    ["南京","苏州","南通","常州"],

    ["福州","福安","龙岩","南平"],

    ["广州","潮阳","潮州","澄海"],

    ["兰州","白银","定西","敦煌"]

];*/

//或者

var city = new Array;

city[0] = Array("北京","天津","上海","重庆");

city[1] = Array("南京","苏州","南通","常州");

city[2] = Array("福州","福安","龙岩","南平");

city[3] = Array("广州","潮阳","潮州","澄海");

city[4] = Array("兰州","白银","定西","敦煌");

function getCity(){

    var sltProvince=document.getElementById("province");

    var sltCity=document.getElementById("city");

    var provinceCity=city[sltProvince.selectedIndex-1];

    sltCity.length=1;

    for(var i=0;i<provinceCity.length;i++){

        sltCity[i+1]=new Option(provinceCity[i],provinceCity[i]);

    }

}

</script>

<form action="#" name="theForm">

    <select name="province" id="province" onchange="getCity()">

        <option value="0">请选择所在省份</option>

        <option value="直辖市">直辖市</option>

        <option value="江苏省">江苏省</option>

        <option value="福建省">福建省</option>

        <option value="广东省">广东省</option>

        <option value="甘肃省">甘肃省</option>

    </select>

    <select id="city" name="city">

        <option value="0">请选择所在城市</option>

    </select>

</form>

</body>

</html>
效果如下：
巴特西

js实现菜单二级联动

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