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网站制作前端JS实现省市联动代码演示：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>省市级联效果</title>
<script type="text/javascript">
function show() {
var citys = new Array();
citys["湖北省"] = ["襄樊市", "武汉市", "随州市", "荆门市", "黄石市", "恩施市", "咸宁市", "仙桃市", "十堰市", "孝感市", "利川市"];
citys["湖南省"] = ["长沙市", "吉首市", "湘潭市", "益阳市", "津市市", "洪江市", "怀化市", "冷水江市", "衡阳市", "郴州市", "永州市", "邵阳市", "岳阳市"];
citys["广东省"] = ["广州市", "深圳市", "佛山市", "汕头市", "珠海市", "韶关市", "江门市", "湛江市", "惠州市", "中山市", "东莞市"];
citys["北京市"] = ["朝阳区", "丰台区", "崇文区", "宣武区", "海淀区", "顺义区", "平谷区", "怀柔区", "房山区", "东城区", "西城区"];
document.getElementById("shi").options.length = 1;
var sheng = document.getElementById("sheng").value;
var newCity;
if (sheng != "-=请选择=-") {
for (var i = 0; i < citys[sheng].length; i++) {
newCity = new Option(citys[sheng][i], citys[sheng][i]);
document.getElementById("shi").options.add(newCity);
}
}
}
</script>
</head>
<body>
<div>
<select id="sheng" onchange="show()">
<option value="-=请选择=-">-=请选择=-</option>
<option value="湖北省">湖北省</option>
<option value="湖南省">湖南省</option>
<option value="广东省">广东省</option>
<option value="北京市">北京市</option>
</select>
<select id="shi">
<option>-=请选择=-</option>
</select>
</div>
</body>
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