JavaScript二级联动菜单代码

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<form name="frm">

    <select name="s1" onChange="redirec(document.frm.s1.options.selectedIndex)">

    <option selected>请选择</option>

    <option value="1">脚本语言</option>

    <option value="2">高级语言</option>

    <option value="3">其他语言</option>

    </select>

    <select name="s2">

    <option value="请选择" selected>请选择</option>

    </select>

    </form>

    <script language="javascript">

    //获取一级菜单长度

    var select1_len = document.frm.s1.options.length;

    var select2 = new Array(select1_len);

    //把一级菜单都设为数组

    for (i=0; i<select1_len; i++)

    {

    select2[i] = new Array();

    }

    //定义基本选项

    select2[0][0] = new Option("请选择", " ");

    select2[1][0] = new Option("PHP", " ");

    select2[1][1] = new Option("ASP", " ");

    select2[1][2] = new Option("JSP", " ");

    select2[2][0] = new Option("C/C++", " ");

    select2[2][1] = new Option("Java", " ");

    select2[2][2] = new Option("C#", " ");

    select2[3][0] = new Option("Perl", " ");

    select2[3][1] = new Option("Ruby", " ");

    select2[3][2] = new Option("Python", " ");

    //联动函数

    function redirec(x)

    {

    var temp = document.frm.s2;

    for (i=0;i<select2[x].length;i++)

    {

    temp.options[i]=new Option(select2[x][i].text,select2[x][i].value);

    }

    temp.options[0].selected=true;

    }

    </script>

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