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apply的意思理解 #24

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xxholly32 opened this issue May 3, 2019 · 0 comments

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xxholly32 commented May 3, 2019 •

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定义一个函数mul

function mul(a,b){
    return this+(a*b);
}

接着我们在控制台上打印出

console.log(mul.call(null,2,3));
console.log(mul.call('s',2,3));
console.log(mul.call(3,2,3));
console.log(mul.apply(null,[2,5]));
console.log(mul.apply(2,[2,5]));

分别为：

[object Window]6
s6
9
[object Window]10
12

function.apply(obj, arg)

function(arg) this = obj

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