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手写call、apply、bind实现及详解
source link: https://juejin.im/post/5c564e3bf265da2d943f3af3
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它们有什么不同？怎么用？ call 接收多个参数，第一个为函数上下文也就是this，后边参数为函数本身的参数。 let obj = { name: "一个" } function all
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