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docs(dom): fix node/getRootNode()
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docs/dom/node.md

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@@ -558,7 +558,7 @@ wrapper.childNodes.length // 1
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### Node.prototype.getRootNode()
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`getRootNode`方法返回当前节点所在文档的根节点,与`ownerDocument`属性的作用相同。
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`getRootNode()`方法返回当前节点所在文档的根节点`document`,与`ownerDocument`属性的作用相同。
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```javascript
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document.body.firstChild.getRootNode() === document
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// true
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```
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该方法可用于`document`节点自身,这一点与`document.ownerDocument`不同。
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```javascript
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document.getRootNode() // document
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document.ownerDocument // null
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```
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