function unique(arr){ return arr.reduce((prev,cur) =>prev.includes(cur) ? prev : [...prev,cur],[]);
}var arr = [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function unique(arr){ return arr.reduce((prev,cur) =>{ return prev.includes(cur) ? prev : [...prev,cur],[];
});
}var arr = [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(cuò)報(bào)問(wèn)題描述更改了箭頭函數(shù)的寫法為什么就會(huì)報(bào)錯(cuò)？Uncaught TypeError: prev.includes is not a function
js 更改箭頭函數(shù)寫法就報(bào)錯(cuò)？
呼啦一陣風(fēng)
2019-03-20 19:17:45
