javascript 简单的数组去重方法

// 最简单数组去重法
/*
* 新建一新数组，遍历传入数组，值不在新数组就push进该新数组中
* IE8以下不支持数组的indexOf方法
* */
let array = [1, 2, 3, 2, 2, 3, 4, 3, 4, 5];
 // 数组去重
function unique(ary) {
   let newAry = [];
   for (let i = 0; i<ary.length; i++) {
      if (newAry.indexOf(ary[i]) === -1) {
        newAry.push(ary[i]);
      }
   }
   return newAry;
}
array = unique(ary);
console.log(array);

let ary = [1, 2, 2, 2, 1, 2, 3, 2, 3, 2, 1],
console.log(Array.from(new Set(ary)));  //=>基于ES6 SET实现去重
或者console.log([...new Set(ary)]);