精通JavaScript第五章：dom

一、遍历dom

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      <h1>介绍dom</h1>


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          这是一个dom的p标签测试


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          <li id="everywhere">it can be found everywhere</li>


          <li class="test">it is easy to user.</li>


          <li class="test">it can help you to find what you want, really quickly.</li>


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