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_toString() 步骤到底起到啥作用

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2016-06-13 11:44:581076browse

__toString() 方法到底起到啥作用

本帖最后由 lghyt3 于 2014-01-13 14:29:34 编辑 听说是自动引用，不解其意，谁能举个栗子啊。
比如下图这个，它写这一大堆玩意，目的是啥尼
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