怎么去除innerHTML获得内容中的标签？

去掉innerHTML获得内容里面的标签：

<body>
 <div id="d1"><p id="p1">hello world </p></div> 
 <!-- javascript:alert(document.getElementById('test').innerHTML.replace(/<.+?>/gim,''))">   /& lt;.+?>/gim,''-->
     <script>  
         var content = document.getElementById("d1");  
         alert(content.innerHTML);
         alert(content.innerHTML.replace(/<.+?>/gim,''));  
     </script>
</body>

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