<div id="div">
  click me
</div>

<script>
  var div=document.getElementById("div");
  div.addEventListener('click',function(){
   alert('You have clicked me!');
  });
  for(var i =0; i<999999999;i++){
   console.log(i);
  }
</script>

<div id="div">
  click me
</div>
<script src="Concurrent.Thread.js"></script>
<script>
  Concurrent.Thread.create(function(){
    var div=document.getElementById("div");
    div.addEventListener('click',function(){
     alert('You have clicked me!');
    });
    for(var i =0; i<9999999;i++){
     console.log(i);
    }
  });
</script>

<div id="div">
  click me
</div>
<script src="Concurrent.Thread.js"></script>
<script type="text/x-script.multithreaded-js">
    var div=document.getElementById("div");
    div.addEventListener('click',function(){
     alert('You have clicked me!');
    });
    for(var i =0; i<9999999;i++){
     console.log(i);
    }
</script>

<div id="div"></div>
<script>
  window.onload=function(){
     var div=document.getElementById("div");
     if(typeof(Worker)!=="undefined"){//在创建WebWorker之前，先判断浏览器是否支持
　　　　　　　 console.log("Start calculating....");
       var time1= new Date()*1;//获得当前时间戳
       var worker=new Worker("fibonacci.js");//创建WebWorker对象，并传递在新线程中将要执行的脚本的路径
       worker.onmessage=function(e){ //监听从新线程发送过来的数据
         div.innerHTML=e.data;
         var time2=new Date()*1;
         console.log("time spend:"+(time2-time1)+"ms");
       }
　　　　　　　　
       worker.postMessage(36);//向新线程发送数据
     }else{
       alert("Your browser do not support WebWoker");
     }
  }
</script>

fibonacci.js：
var fibonacci=function (n){
  return n<3?n:(arguments.callee(n-1)+arguments.callee(n-2));
}
onmessage=function(e){
  var num=parseInt(e.data,10);
  postMessage(fibonacci(num));//向主页面发送数据
}

    worker.postMessage(36);

    worker.postMessage(36);

    worker.postMessage(36);