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js中如何实现this的深拷贝?

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js中如何实现this的深拷贝?

如果使用for循环深度遍历，会导致死循环；
或许可以使用 loadsh库的deepclone来实现，还有什么方式吗，原因是什么？


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生产中可以使用： circular-json 库来实现，避免JSON.stringify, JSON.parse处理循环报错的问题；
实现原理是：转成序列化后，循环引用的对象使用一个特殊的字符器标记来代替，parse的过程再把标记转成要引用的那个对象（this）


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