Question

我在项目中使用命名空间，方法是：

// simply a namespace attic object
// parent to my worker objects
;(function( RoaringSky, undefined ) 
{
    var opt = {
        backend : ""
    },
    name = ""
    ;

    RoaringSky.init = function( options ) {
       jQuery.extend(opt,options);
       console.log( 'RoaringSky.init complete');
    };
    // accessor 
    RoaringSky.opt = opt;

})(window.RoaringSky = window.RoaringSky || {});

这个命名空间的子对象所以：

RoaringSky.Day = (function() {

    // constructor
    var Day = function(){

        var id = "none";
        var name = "none";
        var date = "none";
        var periods = new Array();

        this.periods = function() {
            return periods;
        };
    };

    // invoking day.time() fails - is not a function message
    Day.prototype.time = function() {
        return this.doSomthingWithDate(date);
    };


    return Day;
})(window.RoaringSky.Day = window.RoaringSky.Day || {});

我认为，这种模式可以正常运作。（批评欢迎）但它似乎阻止了原型属性的使用。

也许我的理解是不完整的（我确信它是）但是AFAIK，一旦我创造了一个物体 - 就像我上面的Day课程一样 - 我应该能够以下列的方式编写函数：

Day.prototype.time = function() {
    return this.doSomthingWithDate(date);
};

并且该类的所有实例都将继承该函数，因为它是构造函数的类对象Day（）的属性;

然而，当我尝试这个时：

var day = new Day();
day = new Date();
console.log( 'day.time: '+ day.time() );

我得到了祝福，'day.time（）不是函数'错误消息。

我做错了什么？这开始让我疯狂。

埃里克

Answer 1

夫妻问题：

RoaringSky.Day = (function() {

    // constructor
    var Day = function(){

        var id = "none";
        var name = "none";
        var date = "none";
        var periods = new Array();

        this.periods = function() {
            return periods;
        };
    };

    // invoking day.time() fails - is not a function message
    Day.prototype.time = function() {
        // can't use "date" here since it is not in scope
        return this.doSomthingWithDate(date);
    };


    return Day;
})(window.RoaringSky.Day = window.RoaringSky.Day || {});

然后：

var day = new Day(); // Day is not a member of window, so this will only work when used in the `RoaringSky.Day` declaration.
day = new Date();    // you then override the day variable for some reason
console.log( 'day.time: '+ day.time() ); // time is not a function member of Date

使用Javascript命名空间关闭和原型一起失败？

1 个答案: