JavaScript——HTML DOM - 元素的加入、删除、替换

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一、创建新元素 

1.- appendChild()  先创建该元素，然后把它追加到已有的元素上。

This is a paragraph.
This is another paragraph.

2. - insertBefore()

This is a paragraph.
This is another paragraph.

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二、删除已有的 HTML 元素

This is a paragraph.
This is another paragraph.

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三、替换 HTML 元素

如需替换 HTML DOM 中的元素，请使用 replaceChild() 方法：

实例

This is a paragraph.
This is another paragraph.