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LeeeeeeM/m.js

Created June 20, 2018 02:09
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Map && WeakMap
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m.js
// Map 是 构造函数是 var a = new Map([ [key1, value1], [key2, value2] ])
// key1只要与key2不是同一个引用就不会覆盖。 key1 与key2 可以是任何类型。
// WeakMap 不会进入到垃圾回收机制，当key值清空会自动回收，不进入垃圾回收（垃圾回收里面只要存在引用就不可以被回收，这样可以防止内存泄漏）
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