Question

我正在学习javascript，我想写一个简单的Parse CloudCode脚本。不幸的是我收到了下面发布的错误，这似乎很常见，不幸的是，我在这方面缺乏技能，即使有了可用的资源，我也无法解决问题。

非常感谢任何解决方案，教程或解释。

错误（由iOS应用程序记录）：

error calling 'updateLastSeen' function: Error Domain=Parse Code=141 "TypeError: Cannot call method 'slice' of undefined
    at e.query.first.success (main.js:11:58)
    at e.<anonymous> (Parse.js:14:28998)
    at e.i (Parse.js:14:27703)
    at e.a.value (Parse.js:14:27063)
    at e.i (Parse.js:14:27830)
    at e.a.value (Parse.js:14:27063)
    at e.i (Parse.js:14:27830)
    at e.a.value (Parse.js:14:27063)
    at e.<anonymous> (Parse.js:14:27774)
    at e.i (Parse.js:14:27703)" UserInfo={code=141, temporary=0, error=TypeError: Cannot call method 'slice' of undefined
    at e.query.first.success (main.js:11:58)
    at e.<anonymous> (Parse.js:14:28998)
    at e.i (Parse.js:14:27703)
    at e.a.value (Parse.js:14:27063)
    at e.i (Parse.js:14:27830)
    at e.a.value (Parse.js:14:27063)
    at e.i (Parse.js:14:27830)
    at e.a.value (Parse.js:14:27063)
    at e.<anonymous> (Parse.js:14:27774)
    at e.i (Parse.js:14:27703), NSLocalizedDescription=TypeError: Cannot call method 'slice' of undefined
    at e.query.first.success (main.js:11:58)
    at e.<anonymous> (Parse.js:14:28998)
    at e.i (Parse.js:14:27703)
    at e.a.value (Parse.js:14:27063)
    at e.i (Parse.js:14:27830)
    at e.a.value (Parse.js:14:27063)
    at e.i (Parse.js:14:27830)
    at e.a.value (Parse.js:14:27063)
    at e.<anonymous> (Parse.js:14:27774)
    at e.i (Parse.js:14:27703)}

Main.js CloudCode脚本（相关部分）：

var query = new Parse.Query(Parse.User);
    query.equalTo('email', request.params.email);
    query.first({
        success: function(user) {
            var mutableLastSeenDictionariesArray = user.lastSeen.slice(0);

            for (var i = 0; i < mutableLastSeenDictionariesArray.length; i++) {
                var lastSeen = mutableLastSeenDictionariesArray[i];

                if (lastSeen[response.params.email]) {
                    i = mutableLastSeenDictionariesArray.length+1;
                    mutableLastSeenDictionariesArray.splice(i, 1, request.params["builtDictionary"]);

                    user.lastSeens = mutableLastSeenDictionariesArray;
                    user.save;
                }
            }
        },

        error: function(error) {
            response.error(error.code, "Error: " + error.message);
        }
    });

谢谢。

Answer 1

所以问题是.lastSeens属性是一个数组是空的，因此是未定义的（null）。

解决方案是实施支票?=vLogs(i)="P:\test2.txt" ?=sFile="P:\test2.txt"并相应处理。

感谢@danh指出我正确的方向。

Javascript TypeError：无法调用未定义的方法'slice'

1 个答案: