JavaScript实现二级联动

//获取一级菜单长度
var select1_len = document.gpsiForm.brand.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");
//别克车型
select2[1][0] = new Option("英朗");
select2[1][1] = new Option("威朗");
select2[1][2] = new Option("昂科拉");
select2[1][3] = new Option("昂科威");
select2[1][4] = new Option("君威");
select2[1][5] = new Option("君越");
select2[1][6] = new Option("GL8");
select2[1][7] = new Option("昂科雷");

//福特车型
select2[2][0] = new Option("蒙欧迪");
select2[2][1] = new Option("福克斯");
select2[2][2] = new Option("猛禽");
select2[2][3] = new Option("锐界");
select2[2][4] = new Option("福睿斯");
select2[2][5] = new Option("金牛座");
select2[2][6] = new Option("翼搏");
select2[2][7] = new Option("翼虎");
select2[2][8] = new Option("野马");
select2[2][9] = new Option("探险者");
select2[2][10] = new Option("撼路者");

//雪佛兰车型
select2[3][0] = new Option("新科鲁兹");
select2[3][1] = new Option("科帕奇");
select2[3][2] = new Option("科沃兹");
select2[3][3] = new Option("迈锐宝");
select2[3][4] = new Option("创酷");
select2[3][5] = new Option("赛欧");
select2[3][6] = new Option("乐风");
select2[3][7] = new Option("科迈罗");
select2[3][7] = new Option("探界者");

//联动函数
function redirec(x) {
var temp = document.gpsiForm.carModel;
if (temp.options.length > 0) {
for (var j = temp.options.length; j >= 0; j--) {
temp.options.remove(i);
}
}
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;
}