loadInfo: function(){
    var jsonCounter = 0,room = ['room1','room2','room3'],dates = [],prices = []

    $.each(booking.rooms,function(key,room_name) {
        $.getJSON('/get_info.PHP?room='+room_name,function(data) {
            dates[room_name] = data
            jsonCounter++
        })
        $.getJSON('/get_info.PHP?room='+room_name+'&prices',function(data) {
            prices[room_name] = data
            jsonCounter++
        })

    })

    function checkIfReady() {
        if (jsonCounter === rooms.length * 2) {
            clearInterval(timer)
            run_the_rest_of_the_app()
        }
    }

    var timer = setInterval(checkIfReady,100)

}

(经过多次修改,因为它是类等的一部分等)

目前,这感觉有点hackish,因为计时器使用似乎是垃圾.我会使用$.when和$.done,但我不知道有多少房间,所以我不知道什么时候投入.

所有AJAX请求返回后,如何确保仅调用run_the_rest_of_the_app()？