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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<meta charset="utf-8" />
</head>
<body>
<style type="text/css">
#div1 {
width: 300px;
height: 300px;
border: 1px solid red;
}
</style>
<input type="button" id="btnClear" value="清空" />
<div id="div1">
<button>哈哈</button>
<button>哈哈</button>
<button>哈哈</button>
<button>哈哈</button>
<button>哈哈</button>
<button>哈哈</button>
</div>
<script type="text/javascript">
window.onload = function () {
document.getElementById('btnClear').onclick = function () {
var div1 = document.getElementById('div1');
while (div1.firstChild) {//firstchild属性是第一个子元素，自动向上替补，没有任何子元素时，返回undefined
div1.removeChild(div1.firstChild);//清空子元素
}
};
};
</script>
</body>
</html>