计算JSON中的对象数

Question

我在我的javascript中有这个方法，调用检索URL响应并计算JSON中的对象数。它假设返回值3，但它返回我63。我有什么不对的吗？

这是我的json

   [
        {
            "crisisID": 1,
            "name": "Test1",
            "positionInCMO": "General",
            "threatLevel": 4,
            "crisisType": "Type1",
            "affectedArea": "Area1",
            "estimatedCasualties": 10000,
            "crisisDuration": "Duration1",
            "crisisDetails": "Detail1",
            "courseOfAction": "Action1",
            "consequencesOfAction": "Consequence1",
            "cleanUpAction": "CleanUp1"
        },
        {
            "crisisID": 2,
            "name": "Test2",
            "positionInCMO": "General",
            "threatLevel": 5,
            "crisisType": "Type2",
            "affectedArea": "Area2",
            "estimatedCasualties": 10000,
            "crisisDuration": "Duration2",
            "crisisDetails": "Detail2",
            "courseOfAction": "Action2",
            "consequencesOfAction": "Consequence2",
            "cleanUpAction": "CleanUp2"
        },
        {
            "crisisID": 3,
            "name": "Test3",
            "positionInCMO": "General",
            "threatLevel": 4,
            "crisisType": "Type3",
            "affectedArea": "Area3",
            "estimatedCasualties": 10000,
            "crisisDuration": "Duration3",
            "crisisDetails": "Detail3",
            "courseOfAction": "Action3",
            "consequencesOfAction": "Consequence3",
            "cleanUpAction": "CleanUp3"
        }
    ]

这是我的javascript代码

 function checkForNotifications(){
    $.ajax({
        url: "http://localhost:8080/CMOtoPMO/proposal/", 
        type: "GET",
        success: function(notification) {
            //Check if any notifications are returned - if so then display alert
             alert(Object.keys(notification).length);
        },
        error: function(data){
            //handle any error 
             alert("Error");
        }
    });
}