从 jQuery.get 嵌套函数中获取 var

  function getUserHours(tyPe, tarGet){
    $.get('/activities/search', { 'type': tyPe }, 
    function(data){   
     var hourResultData = jQuery.parseJSON(data);
     var registeredHours = 0; 
     for (var i in hourResultData.activities){
      registeredHours += parseFloat(hourResultData.activities[i].hours);
     }
     $(tarGet).empty().append(registeredHours);
     return registeredHours;
   });

  }

I want:

alert( getUserHours('r', '#reg-hours'));

提醒注册时间

仅当关闭 AJAX 的异步 GET 时，直接返回数据才有效：

$.ajax({
    type: 'GET',
    url: '/activities/search',
    data: { 'type': tyPe },
    async : false,
    success : function() { }
 });

不建议这样做，因为浏览器会阻塞，直到您的请求完成。相反，您应该通过使用函数回调继续遵循异步编程模型：

$.ajax({
    type: 'GET',
    url: '/activities/search',
    data: { 'type': tyPe },
    async : false,
    success : function() { }
 });

function getUserHours(tyPe, tarGet, callback)
{
    $.get('/activities/search', { 'type': tyPe }, 
    function(data)
    {
        var hourResultData = jQuery.parseJSON(data);
        var registeredHours = 0; 
        for (var i in hourResultData.activities){
            registeredHours += parseFloat(hourResultData.activities[i].hours);
        }
        $(tarGet).empty().append(registeredHours);
        if($.isFunction(callback))
            callback(registeredHours);
    });
}

getUserHours('r', '#reg-hours', function(hours) {
    alert(hours);
});