## **字符串去重** 第一种 ``` var a = "acabababdd"; var arr = a.split('');//1.字符串转数组 console.log(arr); arr2 = []; for (var i = 0; i < arr.length; i++) {//2.数组去重复 if (arr2.indexOf(arr[i]) < 0) { arr2.push(arr[i]); } } console.log(arr2); c = arr2.join('');//3.数组转字符串 console.log(c) ``` 第二种 ``` var a = "acabababdd"; var b= [...new Set(a)].join(""); console.log(b); ```