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Maximum value

Math.max (.) / / 4Math.max.apply (this, [1 prev,cur, 2 curIndex,arr) = > {return Math.max (prev,cur);}, 0) / / 4] / / 4 [1, 2, 3, 4].

Math.max () is the built-in method of the Math object, and the argument is a string

Reduce is the array api of ES5. Parameters have functions and default initial values.

The function takes four parameters, pre (last returned value), cur (current value), curIndex (current value index), arr (current array)

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