两种常用的javascript数组去重 方法

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<div id="cnblogs_post_body">第一种是比较常规的方法

思路：
1.构建一个新的数组存放结果
2.for循环中每次从原数组中取出一个元素，用indexOf查找新数组中是否有该元素
3.若没有，则存到结果数组中
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01	Array.prototype.unique1 = function(){