1、ES6语法filter()去重
let arr = ['灭绝师太','周芷若','小龙女','郭襄','小龙女'];
arr = arr.filter((item,index) => arr.indexOf(item) == index);
console.log(arr)
//['灭绝师太','周芷若','小龙女','郭襄']
2、ES6语法new Set()去重
let arr = ['灭绝师太','周芷若','小龙女','郭襄','小龙女'];
arr = Array.from(new Set(arr))
console.log(arr)
//['灭绝师太','周芷若','小龙女','郭襄']
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