javascript数组去重

javascript数组去重—方法一

        let nums = [0,0,1,1,1,2,2,3,3,4];
        let newArray = [];
        let removeDuplicates = function(num,newA) {
            num.forEach((v,i)=>{
                if(newA.indexOf(v) === -1){
                    newA.push(v)
                }
            })
            return newA
        };
        removeDuplicates(nums,newArray)

javascript数组去重—方法二

        let nums = [1,1,1,3,0,0,3,4,4,5,5];
        let ret = [];
        function removeDuplicatedItem3(ar) {
          ar.forEach(function(e, i, ar) {
            if (ar.indexOf(e) === i) {
              ret.push(e);
            }
          });
          console.log(ret)
          return ret;
        }
        removeDuplicatedItem3(nums)

第二种和第一种都差不多，都是利用数组的indexOf方法