案例：HTML DOM案例     状态：可编辑再运行    进入竖版
 运行结果　
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<!DOCTYPE html>
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<html>
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<body>
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​
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<div id="div1">
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<p id="p1">This is a paragraph.</p>
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<p id="p2">This is another paragraph.</p>
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</div>
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​
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<script>
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var parent=document.getElementById("div1");
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var child=document.getElementById("p1");
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var para=document.createElement("p");
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var node=document.createTextNode("This is new.");
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para.appendChild(node);
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parent.replaceChild(para,child);
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</script>
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​
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</body>
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</html>
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​