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解析一道JS面试题
source link: https://juejin.im/post/5a61ab6a51882573385fcebc
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更新（1/23/2018） 写在前面，本文让读者产生了误会。有这样一些原因： JS为何能取到地址值。 a.x = a未解释清楚。 .运算符是否会对赋值运算有所干扰。 首先：本文用addr只是一个代称，表达的是该地址对应的那块内存。 关于2.3点就是本次更新
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