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docs(dom/nodelist): edit HTMLCollection.prototype.namedItem()
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docs/dom/nodelist.md

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@@ -179,7 +179,7 @@ var img0 = c.item(0);
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### HTMLCollection.prototype.namedItem()
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`namedItem`方法的参数是一个字符串,表示`id`属性或`name`属性的值,返回对应的元素节点。如果没有对应的节点,则返回`null`
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`namedItem`方法的参数是一个字符串,表示`id`属性或`name`属性的值,返回当前集合中对应的元素节点。如果没有对应的节点,则返回`null`
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```javascript
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// HTML 代码如下
@@ -188,3 +188,6 @@ var img0 = c.item(0);
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var pic = document.getElementById('pic');
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document.images.namedItem('pic') === pic // true
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```
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`Collection.namedItem('value')`等同于`Collection['value']`
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