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1.ÀûÓÃes6ÖеÄSet

let new_arr=[...new Set([1,2,3,2,4,5])]//[1, 2, 3, 4, 5]

2.ʹÓÃÊý×éÖеÄreduceº¯Êý

let new_arr=[1,2,3,2,4,5].reduce((prev,value)=>{
                if(prev.indexOf(value)<0)
                    prev.push(value);
                return prev;
             },[])//[1, 2, 3, 4, 5]