从嵌套函数访问类成员

Question

我在javascript中有这个类

var MyGird = Class.extend({
  classMemeber1 : "Some Value"
  ,clickEvent : function(){
        this.editor.on({
            afteredit: function() {
                //
                //  HOW TO I ACCESS classMemeber1 from here? ?
                //
                //
            }
        })
})

我如何从afteredit内部访问classMemeber1 ...
谢谢

Answer 1

您需要clickEvent通过在变量中存储this ^[1]来保存对象调用函数的引用.afteredit由于关闭,它将在方法内部可用.

var MyGird = Class.extend({
    classMemeber1: "Some Value",
    clickEvent: function () {
        var self = this; // save object reference
        this.editor.on({
            afteredit: function () {
                // access classMemeber1 from here
                // by using the stored reference
                alert(self.classMemeber1);
            }
        });
    },
    // ...
});

^{[1] 这个运算符在javascript中(注意:'this'不是运算符)}

Answer 2

如果您编写ES6，则可以使用箭头功能：https : //developer.mozilla.org/en/docs/Web/JavaScript/Reference/Functions/Arrow_functions

在您的示例中，应类似于（未经测试）：

var MyGird = Class.extend({
    classMemeber1: "Some Value",
    clickEvent: () => {
        this.editor.on({
            afteredit: () => () {
                alert(this.classMemeber1);
            }
        });
    },
    // ...
});