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docs/dom/node.md
@@ -175,8 +175,8 @@ while (el !== null) {
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```javascript
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// HTML 代码如下
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// <div id="d1">hello</div><div id="d2">world</div>
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-var div1 = document.getElementById('d1');
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-var div2 = document.getElementById('d2');
+var d1 = document.getElementById('d1');
+var d2 = document.getElementById('d2');
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d2.previousSibling === d1 // true
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```
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