原生js怎么删除一个 div

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>增加删除DIV的JS写法</title>
</head>
<body>
<div id="main">
<div id="box">111</div>
<div class="box2">222</div>
</div>
<script type="text/javascript">
var box = document.getElementById("box");
var main = document.getElementById("main");
var newMask = document.createElement("div");
newMask.id ="newMask";
main.appendChild(newMask);
if(box){
box.parentNode.removeChild(box);
}
else{
alert("没有这个div");
}
</script>
</body>
</html>

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