克隆节点

语法
node.cloneNode(true)

 <p class="test">hello world</p>
    <script>
        /* 克隆节点 */
        var test = document.getElementsByClassName("test")[0];
        var cTest = test.cloneNode(true);
        console.log(cTest);
        document.body.appendChild(cTest)
    </script>

         ![image.png](https://cdn.nlark.com/yuque/0/2019/png/446381/1567235568883-924ceaf1-c069-424a-9968-eec6f24c9080.png#align=left&display=inline&height=248&name=image.png&originHeight=248&originWidth=265&size=9448&status=done&width=265)