functionunique(arr){returnarr.reduce((prev,cur)=>prev.includes(cur)?prev:[...prev,cur],[]);}vararr=[1,1,'true','true',true,true,15,15,false,false,undefined,undefined,null,null,NaN,NaN,'NaN',0,0,'a','a',{},{}];console.log(unique(arr));//正常打印functionunique(arr){returnarr.reduce((prev,cur)=>{returnprev.includes(cur)?prev:[...prev,cur],[];});}vararr=[1,1,'true','true',true,true,15,15,false,false,undefined,undefined,null,null,NaN,NaN,'NaN',0,0,'a','a',{},{}];console.log(unique(arr));//錯報問題描述更改了箭頭函數的寫法為什么就會報錯？UncaughtTypeError:prev.includesisnotafunction