方法一：使用reduce，includes1。定义数组letnumArr=['1','9','9','7','0','4','1','2','2','4','0']2。封装一个去重方法remove()functionremove(arr){returnarr.reduce((newarr,cur)=>{if(newarr.includes(cur)===false)newarr.push(cur)returnnewarr},[])}3.执行去重方法remove(numArr)4.输出结果['1','9','7','0','4','2']
