Question

我一直试图调用getMonthDay函数。我传递一个pubDate参数并继续收到错误 - 在ErrorXCopyDisableContinue上中断 this.getMonthDay不是函数

有什么想法吗？

$(document).ready(function(){
    alert = console.log; 


    var ns = {

        init : function(){
            $.ajax({
                url: '/calendar/RSSSyndicator.aspx?type=N&number=15&category=8-0%2c4-0%2c6-0%2c10-0%2c7-0%2c17-0%2c16-0%2c9-0%2c5-0%2c3-0%2c2-0&department=3&numdays=31&ics=Y&rsstitle=Annandale+-+Event+Listing&rssid=11',
                success: this.loaded                
            });
        }, 

        loaded: function(data){

            // Find item from the RSS document and iterate over reach one.
            $(data).find('item').each(function(i, value){

                // Set the title and get rid of all chars including and between ()
                var title = $(this).find('title').text().replace(/\w+\s+\(.*?\)/, "");

                var link = $(this).find('link').text();
                var pubDate = $(this).find('pubDate').text();
                alert(title); 
                alert(link);
                alert(pubDate);

                test = this.getMonthDay(pubDate);


                $('#events').append("<p>" + title + "<br/>" + link + "</p>");

            });

        //  var t = items[0].getElementsByTagName('title');
        //  alert(t[0].firstChild.nodeValue);

        }, 



        getMonthDay : function(pubDate){

            var d = new Date(pubDate);

            d.month = d.getMonth();
            var months = ["January", "February", "March", "Thursday", "Friday", "Saturday", "Sunday"];
            var month = months[d.month]
            var newMonthDay = month + " " + d.getDay();

            return newMonthDay;


        }

    }



    ns.init();




});

Answer 1

这里实际上有两个问题。最直接/本地是this引用.each()循环中的<item>元素，我们可以通过将引用保持在this之外来修复此问题，像这样：

var self = this;

然后在函数内部使用self.getMonthDay(pubDate);。其次，在修复之后......即使然后this不是您想要的，它也会引用您传递给$.ajax()的options对象。要解决此问题，您需要context option来保持this为ns，如下所示：

$(document).ready(function(){
    alert = console.log; 
    var ns = {
        init : function(){
            $.ajax({
                url: '/calendar/RSSSyndicator.aspx?type=N&number=15&category=8-0%2c4-0%2c6-0%2c10-0%2c7-0%2c17-0%2c16-0%2c9-0%2c5-0%2c3-0%2c2-0&department=3&numdays=31&ics=Y&rsstitle=Annandale+-+Event+Listing&rssid=11',
                context: this,          //add this!
                success: this.loaded                
            });
        }, 
        loaded: function(data){
            var self = this;           //maintain a reference to this
            $(data).find('item').each(function(i, value){
                var title = $(this).find('title').text().replace(/\w+\s+\(.*?\)/, "");
                var link = $(this).find('link').text();
                var pubDate = $(this).find('pubDate').text();
                var test = self.getMonthDay(pubDate);
                $('#events').append("<p>" + title + "<br/>" + link + "</p>");
            });
        }, 
        getMonthDay : function(pubDate){
            var d = new Date(pubDate);
            d.month = d.getMonth();
            var months = ["January", "February", "March", "Thursday", "Friday", "Saturday", "Sunday"];
            var month = months[d.month]
            var newMonthDay = month + " " + d.getDay();
            return newMonthDay;
        }
    }
    ns.init();
});

Answer 2

您正在传递给this.getMonthDay的回调中呼叫.each()。那时，this是一个完全不同的背景。相反，请考虑以下内容：

loaded: function(data){

    var ns = this;

    // Find item from the RSS document and iterate over reach one.
    $(data).find('item').each(function(i, value){

        // Set the title and get rid of all chars including and between ()
        var title = $(this).find('title').text().replace(/\w+\s+\(.*?\)/, "");

        var link = $(this).find('link').text();
        var pubDate = $(this).find('pubDate').text();
        alert(title); 
        alert(link);
        alert(pubDate);

        test = ns.getMonthDay(pubDate);


        $('#events').append("<p>" + title + "<br/>" + link + "</p>");

    });

//  var t = items[0].getElementsByTagName('title');
//  alert(t[0].firstChild.nodeValue);

},

请注意为ns创建别名（this），然后可以继续引用该对象，而不管以后可能会使用哪些对象/上下文。

帮助文字语法 - 不是一个函数

2 个答案: