意外令牌，ES6数组

Question

I have the following code.
It is an array but it throws the error:

 Uncaught SyntaxError: Unexpected token , 

var counting = {4, 2, 14}.map((x) => {
    var add = x + 1;
    return x * add;
});
console.log(counting);

Answer 1

You confuse [] array construction with {} object construction .

 var counting = [4, 2, 14].map((x) => { return x * (x + 1); }); console.log(counting); 

I have removed the extra line of code that simply added one to x . This makes the code easier to read and maintain.

Answer 2

数组文字符号使用[]而不是{} 。