huitingW
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huitingW
reduce简单用法--求和、乘积 `var arr = [1, 2, 3, 4]; var sum = arr.reduce((x,y)=>x+y) var mul = arr.reduce((x,y)=>x*y) console.log( sum ); //求和，10 console.log( mul ); //求乘积，24` reduce高级用法 （1）计算数组中每个元素出现次数 `let names = ['Alice',...