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in Technique[技术] by (71.8m points)

怎样理解连续使用的call() apply()

function Foo() {}
Foo.prototype.method = function(a, b, c) { 
  console.log(this, a, b, c);
};
Foo.method = function() { 
  Function.call.apply(Foo.prototype.method, arguments);
};

Foo.method(1, 2, 3, 4)

调用了apply方法之后,为什么会自动把arguments拆分成为arguments[0]和[...arguments].slice(1)两部分,并且把arguments[0]作为call方法的this值


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by (71.8m points)

仔细想了下,其实就是常规的call调用,

Foo.prototype.method.call(1,2,3,4)

2,3,4分别就是该函数对应的参数


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