JavaScript 数组去重

使用es5

var arr=[1,2,3,4,5,6,3,4,1,2,3,5,"a","b","c","a"];

var new_arr=[];

var new_obj={};

for(var i=0;i<new_arr.length;i++){

if(!new_obj.arr[i]){

new_arr.push(arr[i])

new_obj.arr[i]=true;

} }

console.log(temp_arr)  // [1, 2, 3, 4, 5, 6, "a", "b", "c"] 

使用es6

var arr=[1,2,3,4,5,6,3,4,1,2,3,5,"a","b","c","a"];

var newarr=new Set(arr);

console.log(newarr) // [1, 2, 3, 4, 5, 6, "a", "b", "c"]