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Math.max() 方法还能这么写啊?

红框中的Math.max.apply(Math,arr);
那个max()是一个方法啊,max()方法括号是放参数的,这Math.max.apply()是怎么把参数传到max()方法里面的啊?

难道 fn.fn1(); fn的参数就是fn1的返回值吗?相当于 fn(fn1());?
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面试题来了,call和apply有什么区别? Math.max 的入参本来就是支持多个,但是因为你是个数组,你想取里面最大的值应该怎么写?Math.max(...[1,2,3,4])

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