## 将字符串去重 思路： "abcaca"; ["a","b","c","a","c","a"] ["a","b","c"] "abc" ``` var a = "abcaca"; var arr = a.split(""); //首先将它变成数组 console.log(arr); // ["a", "b", "c", "a", "c", "a"] var temp = []; //之后开始去重 arr.forEach(ele =>{ if(!temp.includes(ele)){ temp.push(ele) } }) console.log(temp); // ["a", "b", "c"] var arr2 = temp.join(""); //使用join变成字符串 console.log(arr2); //abc ``` ## es6新方法set： ``` var a = "abcaca"; var b = [...new Set(a)].join(""); console.log(b); ```