所有ajax请求完成后如何调用alert？

I'm making in code a few requests with JQuery and get. It looks like:

我在代码中用JQuery做了一些请求并得到了。看起来像：

$.get('address1', function() { ... });
$.get('address2', function() { ... });
$.get('address3', function() { ... });

// This code should be runned when all 3 requests are finished
alert('Finished');

So, are there any ways to detect whether there is still processing request and run marked code only when all 3 requests are finished.

那么，是否有任何方法可以检测是否仍有处理请求并仅在所有3个请求完成时运行标记代码。

Thanks.

谢谢。

4 个解决方案

#1

You can make use of deferred objects ^[docs] introduced in jQuery 1.5:

您可以使用jQuery 1.5中引入的延迟对象[docs]：

$.when(
    $.get('address1', function() { ... }),
    $.get('address2', function() { ... }),
    $.get('address3', function() { ... })
).then(function() {
    alert('Finished');
});

Reference: jQuery.when

参考：jQuery.when

The jQuery learning center has a nice introduction to deferred objects / promises.

jQuery学习中心对延迟对象/承诺进行了很好的介绍。

#2

 var isFinished = [];

$.get('address1', function() { isFinshed.push["address1"]; allDone(); });
$.get('address2', function() { isFinshed.push["address2"]; allDone(); });
$.get('address3', function() { isFinshed.push["address3"]; allDone();});

var allDone = function(){
    if(isFinished.length < 3)return

    alert('Finished');
};

#3

var fin1 = false;
var fin2 = false;
var fin3 = false;

$.ajax({
  url: "address1",
  success: function(){
    fin1 = true;
    fnUpdate();
  }
});

$.ajax({
  url: "address2",
  success: function(){
    fin2 = true;
    fnUpdate();
  }
});

$.ajax({
  url: "address3",
  success: function(){
    fin3 = true;
    fnUpdate();
  }
});

function fnUpdate(){
  if(fin1 && fin2 && fin3){
    alert('fin');
  }
}

#4

var count = 0;
$.get('address1', function() { count++; ... });
$.get('address2', function() { count++; ... });
$.get('address3', function() { count++; ... });

var int = setInterval(function() {
    if (count === 3) {
        clearInterval(int);
        alert('done');
    }
}, 10);

#1