x="<a href='http://www.microsoft.com' target='_blank'>microsoft</a>";
<!DOCTYPE html>
<html>
<body>
<p>点击这个按钮,获得随机链接。</p>
<button onclick="myFunction()">点击这里</button>
<p id="demo"></p>
<script>
var rand = {};
rand.get = function (begin,end){
return Math.floor(Math.random()*(end-begin))+begin;
}
var x = rand.get(1,3)
function myFunction()
{
if (x==1)
x="<a href='/' target='_blank'>W3xue.com</a>";
else