Dom练习

<title>联系Dom操作，点击添加三条数据</title>
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window.onload=function(){
var oUl=document.getElementById('oUl');
var oBtn=document.getElementById('oAdd');
  oBtn.onclick=function(){
      for(var i=0;i<3;i++){
          var oItem=document.createElement('li');
          oItem.innerHTML=i+1;
          oUl.appendChild(oItem);
       }
      
  }
}
</script>