js 概率计算(简单版)

//7：3运算if(Math.ceil(Math.random()*10)>3){  //占比=7  alert('7');  window.location.href="http://www.baidu.com" rel="external nofollow" ;}else{  //占比=3  alert(3);  widnow.location.href="//www.VeVB.COm";}