javascript object literal - 嵌套函数和"this"关键字

Question

在下面的示例中,functionA()调用when时,this关键字引用包含对象,因此我可以访问其属性(例如theValue)

我的问题:如何myObj在嵌套中 引用from的属性functionB()？

var myObj = {
    theValue: "The rain in Spain", 
    functionA: function() {
        alert(this.theValue);
    },
    moreFunctions: {
        functionB: function() {
            alert(????.theValue);
        }
    }
}

myObj.functionA(); 
myObj.moreFunctions.functionB();  

提前致谢.

Answer 1

立即援引救援!

var myObj = (function () {
    var that = {
        theValue: "The rain in Spain", 
        functionA: function() {
            alert(this.theValue); // or that.theValue, both work here
        },
        moreFunctions: {
            functionB: function() {
                alert(that.theValue);
            }
        }
    };
    return that;
}()); // <-- immediate invocation !!

您可以进一步分解它:

var myObj = (function () {
    function functionA() {
        alert(that.theValue);
    }
    function functionB() {
        alert(that.theValue);
    }
    var that = {
        theValue: "The rain in Spain", 
        functionA: functionA,
        moreFunctions: {
            functionB: functionB
        }
    }
    return that;
}());

如果您熟悉OOP,则可以使用它来创建私有变量.

Answer 2

您可以简单地使用myObj：

alert(myObj.theValue);

查看演示http://jsbin.com/izugon/2/edit