试试这个方法。在Java脚本函数中进行循环以等待ajax调用完成。

function getLabelById(id)
{
    var label = '';
    var done = false;
    $.ajax({
       cache: false,
       url: "YourMvcActionUrl",
       type: "GET",
       dataType: "json",
       async: false,
       error: function (result) {
         label='undefined';
         done = true;
        },
       success: function (result) {
            label = result.Message;
            done = true;
        }
     });

   //A loop to check done if ajax call is done.
   while (!done)
   {
      setTimeout(function(){ },500); // take a sleep.
   }

    return label;
}

在@BBonifield回答的基础上，我写了一个实用函数，这样信号量逻辑就不会分布在所有ajax调用中。

untilAjax是一个实用函数，它在所有ajaxCalls完成后调用回调函数。

ajaxObjs是一个ajax设置对象的数组[http://api.jquery.com/jQuery.ajax/]。

Fn是回调函数

function untilAjax(ajaxObjs, fn) {
  if (!ajaxObjs || !fn) {
    return;
  }
  var ajaxCount = ajaxObjs.length,
    succ = null;

  for (var i = 0; i < ajaxObjs.length; i++) { //append logic to invoke callback function once all the ajax calls are completed, in success handler.
    succ = ajaxObjs[i]['success'];
    ajaxObjs[i]['success'] = function(data) { //modified success handler
      if (succ) {
        succ(data);
      }
      ajaxCount--;
      if (ajaxCount == 0) {
        fn(); //modify statement suitably if you want 'this' keyword to refer to another object
      }
    };
    $.ajax(ajaxObjs[i]); //make ajax call
    succ = null;
  };

示例:doSomething函数使用untilAjax。

function doSomething() {
  // variable declarations
  untilAjax([{
    url: 'url2',
    dataType: 'json',
    success: function(data) {
      //do something with success data
    }
  }, {
    url: 'url1',
    dataType: 'json',
    success: function(data) {
      //do something with success data
    }
  }, {
    url: 'url2',
    dataType: 'json',
    success: function(response) {
      //do something with success data
    }
  }], function() {
    // logic after all the calls are completed.
  });
}

我找到了一个简单的方法，使用shift()

function waitReq(id)
{
  jQuery.ajax(
  {
    type: 'POST',
    url: ajaxurl,
    data:
    {
      "page": id
    },
    success: function(resp)
    {
      ...........
      // check array length if not "0" continue to use next array value
      if(ids.length)
      {
        waitReq(ids.shift()); // 2
      )
    },
    error: function(resp)
    {
      ....................
      if(ids.length)
      {
        waitReq(ids.shift());
      )
    }
  });
}

var ids = [1, 2, 3, 4, 5];    
// shift() = delete first array value (then print)
waitReq(ids.shift()); // print 1

美元。当不为我工作时，回调(x)而不是返回x工作如下所述:https://stackoverflow.com/a/13455253/10357604

看看我的解决方案:

1.将这个函数(和变量)插入到你的javascript文件:

var runFunctionQueue_callback;

function runFunctionQueue(f, index, callback) {

  var next_index = index + 1

  if (callback !== undefined) runFunctionQueue_callback = callback;

  if (f[next_index] !== undefined) {
    console.log(index + ' Next function avalaible -> ' + next_index);
    $.ajax({
      type: 'GET',
      url: f[index].file,
      data: (f[index].data),
      complete: function() {
        runFunctionQueue(f, next_index);
      }
    });
  } else {
    console.log(index + ' Last function');
    $.ajax({
      type: 'GET',
      url: f[index].file,
      data: (f[index].data),
      async: false,
      complete: runFunctionQueue_callback
    });
  }
}

2.用你的请求构建一个数组，像这样:

var f = [
           {file: 'file_path', data: {action: 'action', data: 'any_data}},
           {file: 'file_path', data: {action: 'action', data: 'any_data}},
           {file: 'file_path', data: {action: 'action', data: 'any_data}},
           {file: 'file_path', data: {action: 'action', data: 'any_data}}
        ];

3.创建回调函数:

function Function_callback() {
  alert('done');
}

4.使用参数调用runFunctionQueue函数:

runFunctionQueue(f, 0, QuestionInsert_callback);
// first parameter: array with requests data
// second parameter: start from first request
// third parameter: the callback function

我的解决方案如下

var request;
...
'services': {
  'GetAddressBookData': function() {
    //This is the primary service that loads all addressbook records 
    request = $.ajax({
      type: "POST",
      url: "Default.aspx/GetAddressBook",
      contentType: "application/json;",
      dataType: "json"
    });
  },

  ...

  'apps': {
    'AddressBook': {
      'data': "",
      'Start': function() {
          ...services.GetAddressBookData();
          request.done(function(response) {
            trace("ajax successful");
            ..apps.AddressBook.data = response['d'];
            ...apps.AddressBook.Filter();
          });
          request.fail(function(xhr, textStatus, errorThrown) {
            trace("ajax failed - " + errorThrown);
          });

工作得很顺利。我已经尝试了许多不同的方法，但我发现这是最简单和最可重用的方法。希望能有所帮助