var arr=[1,2,"a",2,4,1,4,"a",5,6,7,8,"aa","bb","c","a"]var arr=[1,2,"a",2,4,1,4,"a",5,6,7,8,"aa","bb",
阅读背景：
js五种不同的遍历 （filter, map,foreach,every, some,）
来源：互联网
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