Javascript 解析-未捕获类型错误：无法读取属性'；获取'；未定义的

我正在使用javascript解析。我试图得到一个对象，我正在密切关注文档。我最终还是犯了错误

未捕获的TypeError:无法读取未定义的属性“get”

$(document).ready(function(){

Parse.initialize("myInfo","myInfo");

var count = Parse.Object.extend('overallCount');
var myQuery = Parse.Query(count);

myQuery.get('Gqwk38uUYz', {  //HERE IS THE PROBLEM
    success: function(count) {
        // The object was retrieved successfully.
        var myCount = count.get('count');
        var updatedCount = myCount+1;

        $("#myNum").val(updatedCount);

        count.save(null, {
            success: function(count) {
                count.set('count', updatedCount);

                count.save();
            },
            error: function(model, error) {
                // This will be called.
                // error is an instance of Parse.Error with details about the error.
                if (error.code === Parse.Error.OBJECT_NOT_FOUND) {
                    alert("Uh oh, we couldn't find the object!");
                } else if (error.code === Parse.Error.CONNECTION_FAILED) {
                    alert("Uh oh, we couldn't even connect to the Parse Cloud!");
                }
            }
        });
    },
    error: function(object, error) {
        // The object was not retrieved successfully.
        // error is a Parse.Error with an error code and message.

    }
});
});

---

您将得到错误，因为myQuery确实未定义。您必须使用“新建”来创建查询对象。将类名大写也是一种很好的做法：

var Count = Parse.Object.extend('overallCount');
var myQuery = new Parse.Query(Count);