我如何在for循环后直到for循环完成其交互之前不运行代码？

Question

How do I stop the alert function from running until after the for loop has completed all its interations?

 $(document).ready(function() {
    for (i = 1; i <= 8; i++) {
        $('#ponyDiv').animate({left: '200px'}, 2000); 
    }
    alert("here");
});

Answer 1

Edit: when calling animate() in a loop, you can do the following:

$(document).ready(function () {
    var completed = 0;
    for (i = 1; i <= 8; i++) {
        $('#ponyDiv'+i).animate({
            left: '200px'
        }, 200, function () {
            if (completed++ == 7) alert("here");
        });
    }
});

---

Use JQuery animate() 'complete' callback which will be called right after your animation has completed:

  $('#ponyDiv').animate({left: '200px'}, 2000, function() {
    alert('here');
  });

Answer 2

This will alert when the loop is completed (not when the final animation is completed).

$(document).ready(function() {
    for (i = 1; i <= 8; i++) {
        $('#ponyDiv' + i).animate({left: '200px'}, 2000);
        if(i === 8){
            alert("here");
        }
    }    
});

Answer 3

use deferred:

$.when($('[id^=pony]').animate({left:'200px'},2000))
    .then(function() { alert('done'); });

it's better of course to use a class than attribute starts with on id, but you get the gist of it.