| 1 | /*
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| 2 | * @Author: zhongjiahao
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| 3 | * @Date: 2016-11-01 18:35:52
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| 4 | * @Last Modified by: zhongjiahao
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| 5 | * @Last Modified time: 2016-11-01 18:36:20
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| 6 | */
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| 7 | // 判断n 元素是否是 root中的子元素
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| 8 | export default function contains(root, n) {
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| 9 | var node = n;
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| 10 |
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| 11 | while (node) {
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| 12 | if (node === root) {
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| 13 | return true;
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| 14 | }
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| 15 |
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| 16 | node = node.parentNode;
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| 17 | }
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| 18 |
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| 19 | return false;
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| 20 | } |
| \ | No newline at end of file |