call、apply、bind的共同点及区别

共同点：都可以改变this指向

区别：

call、apply可以立即执行，bind不会立即执行，因为bind返回的是一个函数，所以需要在后面加上（）执行

参数不同：apply的第二个参数式数组。call和bind有多个参数需要挨个写。

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