js省市联动

<select id="country" onchange="change(this.value)">
	<option value="0">请选择</option>
	<option value="中国">中国</option>
	<option value="美国">美国</option>
	<option value="德国">德国</option>
	<option value="日本">日本</option>
</select>

<select id="city">
	
</select>

//创建一个数组存储数据
	var arr=new Array(4);
	arr[0]=["中国","南京","抚州","临洮","日喀则","哈密"];
	arr[1]=["美国","华盛顿","底特律"];
	arr[2]=["德国","慕尼黑","柏林","法兰克福"];
	arr[3]=["日本","北海道","大阪"];
	
function change (val) {

	var sel2=document.getElementById("city");
	sel2.innerHTML="";
	var ops=document.createElement("option");
	for (var i = 0; i < arr.length; i++) {
		if(arr[i][0]==val)
			for (var j = 1; j < arr[i].length; j++) {
				var ops=document.createElement("option");
				var text1=document.createTextNode(arr[i][j]);
				ops.appendChild(text1);
				sel2.appendChild(ops);	
			}
	}

}