11 2019 档案
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摘要：转载：https://blog.csdn.net/weixin_34179968/article/details/88002844 一：数据存储与赋值：1：基本数据类型在栈中存储变量名和值。null和undefined，都是数据类型，undefined表示未定义，有且仅有一个值，就是undefine
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