今天,突然有实力要搞一下new,搜了一下。
http://stackoverflow.com/questions/1646698/what-is-the-new-keyword-in-javascriptIt creates a new object. The type of this object, is simply object.
It sets this new object's internal, inaccessible, [[prototype]] property to be the constructor function's external, accessible, prototype object.
It executes the constructor function, using the newly created object whenever this is mentioned.
It returns the newly created object, unless the constructor function returns a non-primitive value. In this case, that non-primitive value will be returned.这句最经典。
It returns the newly created object, unless the constructor function returns a non-primitive value. In this case, that non-primitive value will be returned.
http://stackoverflow.com/questions/1646698/what-is-the-new-keyword-in-javascriptIt creates a new object. The type of this object, is simply object.
It sets this new object's internal, inaccessible, [[prototype]] property to be the constructor function's external, accessible, prototype object.
It executes the constructor function, using the newly created object whenever this is mentioned.
It returns the newly created object, unless the constructor function returns a non-primitive value. In this case, that non-primitive value will be returned.这句最经典。
It returns the newly created object, unless the constructor function returns a non-primitive value. In this case, that non-primitive value will be returned.
解决方案 »
- 【EXT】关于EXT-grid中JSON数据串含有map的问题
- 如何限制onclick onfocus事件只触发一个
- 页面中怎么使用js控制checkbox是否可以使用啊?
- js用来验证输入,如何实现输入条件不足时,重新回到输入位置
- 什么工具可以观看HTTP 协议头。要小巧简单的工具,大工具不要!
- 匹配img的src
- 帮助我入门javascript+asp数据库数据
- 求教:如何用Javascript自动开始一个文件下载?
- 请教一个有关于iframe的问题
- 双倍的分解决同一个问题,就看在分的份上帮我解决一下这个问题吧
- 求助求助!如何在html里用javascript输入一个数值输出相应文本?
- highchart
把this这东西给确定。
如果没返回值,就把this返回。