数组迭代的方法

一般有foreach,every,filter,map,some,还有es6新加的 reduce / reduceRight 和 find / findIndex   对低版本的浏览器的兼容不太好

1.

var arr = [1, 2, 3];

arr.forEach(function (element, index, array) {
  console.log(element, index, array)
})

//output
1 0 [1, 2, 3]
2 1 [1, 2, 3]
3 2 [1, 2, 3]

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