以相反的顺序创建数组

Question

I've got buttons with a common class ( buttons ). How can I add their ID s in to an array in a reverse order?

var yourArray = [];
$('.buttons').each(function() {
     yourArray.push( $(this).prop('id') );
});

Answer 1

You could create the array by adding each element to the beginning of the array using unshift() :

var yourArray = [];
$('.buttons').each(function() {
     yourArray.unshift(this.id);
});

Alternatively you can create it in the current order and then reverse() it. Also note that you can use map() to create the array initially:

var yourArray = $('.buttons').map(function() {
    return this.id;
}).get().reverse();

Finally you can use this.id instead of creating a jQuery object just to access a property already accessible without the need of object creation.

Answer 2

You can do something simple with map() and reverse()

 var yourArray = $('.buttons').map(function() { return this.id; // get the id }) .get() // get the array .reverse(); // reverse the array console.log(yourArray); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> <button id="a" class="buttons"></button> <button id="b" class="buttons"></button>