JS数组去重

Posted 2020-12-18 Evengod

1.indexOf()

 1 function unique(arr){
 2     var array = [];
 3         for(var i = 0, len = arr.length; i < len; i++){
 4             if(array.indexOf(arr[i]) === -1){
 5                     array.push(arr[i]);
 6                 }    
 7         }
 8         return array;
 9 }
10 var arr = [0,0,0,1,3,2,3,5,3,2];
11 console.log(unique(arr));
12 //[0,1,3,2,5]

2.遍历相邻数据对比

function uniqye(arr){
  var array = [];
  for(var i = 0,len = arr.length; i < len; i++){
        if(arr[i] !== arr[i-1]){
             array.push(arr[i]);
        }
  }    
  return array;  
}
var arr = [1,1,1,2,4,5,2,3,3,2,5];
console.log(unique(arr));
//[1,2,4,5,3]