code：
<html>
<head>
<title>Introduction to the DOM</title>
</head>
<body>
<h1>Introduction to the DOM</h1>
<p class="test">There are a number of reasons why the DOM is awesome,
here are some:</p>
<ul>
<li id="everywhere">It can be found everywhere.</li>
<li id="test">It‘s easy to use.</li>
<li class="test">It can help you to find what you want, really quickly.</li>
</ul>
<script>
//直到文档完全载入，我们才能操作 DOM
window.onload = function() {
//找到文档中所有的<li>元素
var li = document.getElementsByTagName("li");
//然后给它们全部加上边框
for ( var j = 0; j< li.length; j++ ) {
li[j].style.border = "1px solid #000";
}
//定位 ID 为‘everywhere‘的元素
var every = document.getElementById( "everywhere" );
//并将它从文档中移除
every.parentNode.removeChild( test );
};
</script>
</body>
</html>
