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面试 | JS 闭包经典使用场景和必刷题 #2
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Mar 19, 2021
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思维导图
闭包
上级作用域的概念
思考题
JS 堆栈内存释放
堆内存:存储引用类型值,对象类型就是键值对,函数就是代码字符串。
堆内存释放:将引用类型的空间地址变量赋值成
null
,或没有变量占用堆内存了浏览器就会释放掉这个地址栈内存:提供代码执行的环境和存储基本类型值。
栈内存释放:一般当函数执行完后函数的私有作用域就会被释放掉。
闭包是什么
形成闭包的原因
闭包的作用
闭包经典使用场景
return
回一个函数使用闭包需要注意什么
经典面试题
let
参考
深入理解JavaScript闭包之什么是闭包
JavaScript深入之闭包
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