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));//錯報(bào)問題描述更改了箭頭函數(shù)的寫法為什么就會報(bào)錯?Uncaught TypeError: prev.includes is not a function
js 更改箭頭函數(shù)寫法就報(bào)錯?
料青山看我應(yīng)如是
2019-03-20 16:09:56