Update index.js #430
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Update index.js #430
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现在生成的虚拟列表没有key值，每次滑动时，vue都需要更新。
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| 由于没有key值，每次滑动时，oldChildList和childList都需要重新patch。特别影响性能 |
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现在生成的虚拟列表没有key值，每次滑动时，vue都需要更新。
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