var r,
arr = ['apple', 'strawberry', 'banana', 'pear', 'apple', 'orange', 'orange', 'strawberry']; r = arr.filter(function (element, index, self) { return self.indexOf(element) === index; }); r.length本文共 250 字，大约阅读时间需要 1 分钟。
var r,
arr = ['apple', 'strawberry', 'banana', 'pear', 'apple', 'orange', 'orange', 'strawberry']; r = arr.filter(function (element, index, self) { return self.indexOf(element) === index; }); r.length转载于:https://my.oschina.net/ChinaKingM/blog/819929