JS控制鼠标拒绝点击某一按钮的实例

JS控制按钮禁止被选择

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>Document</title>
 <script>
 window.onload=function(){

  document.getElementById("s").onmouseover=function(evet){

   var _x=this.offsetLeft;
   var _y=this.offsetTop;
   var x=Math.random()*180+Math.random()*50;
   var y=Math.random()*120+Math.random()*50;
   this.style.position="absolute";
   this.style.top=y+'px';
   this.style.left=x+'px';
   return false;

  }
  document.getElementById("s").onclick=function(){
  alert("就知道你心里想的和表面做的是相反的！");
  document.getElementById("main").style.display="none";
  document.getElementById("img").style.display="block";
  }
  document.getElementById("w").onclick=function(){
  alert("宝贝：谢谢你的爱!我爱你╮(╯▽╰)╭");
  document.getElementById("main").style.display="none";
  document.getElementById("img").style.display="block";
  }
}

 </script>
 <style>
 *{
 margin:0;
 padding:0;
 }
 html{
 height: 100%;
 background:url(http://img17.3lian.com/d/file/201702/13/9524e4e08e99e0423f9e9f299e314c72.gif) no-repeat;
 background-size: cover;
 }
 span{
 width: 100%;
 height: 100px;
 display: block;
 text-align: center;
 line-height: 100px;
 color: #fff;
 }
 section{
 }
 section button:nth-child(1){
 position: absolute;
 background: #DE7C2C;
 left: 100px;
 border: 0;
 z-index: 1;
 }
 section button:nth-child(2){
 position: absolute;
 z-index: 0;
 border: 0;
 background: #DE7C2C;
 left: 150px;
 }
 div{
  width:300px;
  height:200px;
  background:rgba(34,93,146,.7); 

  border:1px solid #eee;
  position:absolute;
  left:0;
  top: 0;
  bottom: 0;
  right: 0;
  margin: auto;
 }
 </style>
</head>
<body>
 <div id="main">
 <span>亲爱的我爱你，你爱我吗？</span>
 <section>
 <button id="s" style="padding:1px 10px;">不</button>
  <button id="w" style="padding:1px 10px;">爱</button>
 </section>

</div>
<div id="img" style=" display:none; width:100%; height:100%; background:url(http://upfile.asqql.com/2009pasdfasdfic2009s305985-ts/2017-8/20178172014060928.gif) no-repeat; background-size:cover;"></div>
</body>
</html>

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