js 一次按钮事件获取全部数据

<html>
<head>
<meta charset="UTF-8">
<style>
div{ border: solid 1px red; width: 200px; height: 200px;}
</style>
</head>
<body >
<button onclick="s()">点我</button>
<div id="hh"></div>
</body>
<script type="text/javascript">
   第一个方法:
var mycar=new Array("df","dff","fdsf");
 var dd=document.getElementById("hh");
 for (var i=0;i<3;i++){
  dd.innerHTML=dd.innerHTML+"<br />"+mycar[i];

 }

   第二个方法:

var mycar=new Array("df","dff","fdsf");
var str="";
var dd=document.getElementById("hh");
for (var i=0;i<3;i++){
             str=str+mycar[i]+"<br />";
}
dd.innerHTML=str;


}





</script>
</html>  

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