1.第一种方法

 1 var arr = [1,2,3,1,2]
2 var newArr = []
3 for(var i = 0; i < arr.length; i++) {
4     var item = arr[i]
5     if(newArr.indexOf(item) === -1) {
6         newArr.push(item)
7     }
8 }
9 console.log(newArr)    // [1,2,3]

2.第二种方法

  1 var arr = [1,2,3,1,2]
 2 var newArr = []
 3 var obj = {}
 4 for(var i = 0; i < arr.length; i++) {
 5     var item = arr[i]
 6     if(obj[item] === undefined) {
 7         obj[item] = 1
 8         newArr.push(item)
 9     }
10 }
11 console.log(newArr)  // [1,2,3]

 
转载于猿2048:⇛《数组去重》