Question

我在这里做了一件非常简单的事情，但却说错误

TypeError：无法设置属性＆＃39;问题＆＃39;未定义的在setQuestion

我无法弄清楚导致它的原因。我是AngularJS的新手，所以我可能会离开这里，但它与$ scope有什么关系吗？

 var questions = [
                    { header:"Hello World 1", body:["1 dfhgjkmhngfsdgfhytgh", "1 dfhgjkmhngfsdgfhytgh"], answer:"dfghf"},
                    { header:"Hello World 2", body:["2 dfhgjkmhngfsdgfhytgh"], answer:"dfghf"},
                    { header:"Hello World 3", body:["3 dfhgjkmhngfsdgfhytgh", "1 dfhgjkmhngfsdgfhytgh", "1 dfhgjkmhngfsdgfhytgh"], answer:"dfghf"},
                    { header:"Hello World 4", body:["4 dfhgjkmhngfsdgfhytgh"], answer:"dfghf"},
                    { header:"Hello World 5", body:["5 dfhgjkmhngfsdgfhytgh"], answer:"dfghf"}
                ];

        this.question = {};

        var setQuestion = function(index){
            this.question = questions[index];
        }

        setQuestion(0);
        console.log("Question is: " + this.question.header);

感谢任何帮助或解释

Answer 1

var setQuestion = function(index){
    this.question = questions[index];
}

在此上下文中，

this是您的函数 setQuestion，而不是您在上面声明的对象。它与说setQuestion.question相同，但尚未宣布。

将您的this.question = {};更改为var question = {}，并在功能内将this.question更改为question，使其看起来像

var question = {};

var setQuestion = function(index){
   question = questions[index];
}

无法在方法中设置undefined属性'var'

1 个答案: