Javascript - 如何创建对象数组，其中对象的键都具有相同的值

Question

I created a descending array of integers from the current year to 1930 using moment :

options = Array(moment().year() - 1929).fill().map((_, index) => moment().year() - index)

I'm trying to convert options into an array of objects such that the resulting array is something like this:

[{value: '2018', label: '2018'}, {value: '2017', label: '2017'}, ..., {value: '2', label: '2'}, {value: '1', label: '1'}]

Answer 1

Just .map each item to an object instead of to a single number:

 const options = Array(moment().year() - 1929) .fill() .map((_, index) => { const value = moment().year() - index; return { value, label: value }; }); console.log(options); 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.22.2/moment.min.js"></script> 

Answer 2

What What you want is another map . map will always take an array of a given length in an order and produce another array of the same length in the same order (in JS). So if we take your code and then add on:

options.map(o => o.toString).map(o => ({ value: o, label: o }))

you'd get get your objects.