<html> <head> <title>This is a test!</title> </head> <body> <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> </body> </html>
效果
