function openWindow(){
var ck=confirm("確認打開新窗口？")
var theUrl;
if(ck==true){
theUrl=prompt("請輸入url地址","http：//www.xianlaiwan.cn/"); window.open('theUrl','_blank');
}
}
<script type="text/javascript">
function add(){
var p1 = document.getElementById("p1");
p1.className="one";
}
function modify(){
var p2 = document.getElementById("p2");
p2.className="two";
}
</script>
