创建像C＃属性的javascript属性 [英] Create javascript property like C# property

问题描述

是否可以在javascript对象上创建一个与C＃中的属性类似的属性。

Is it possible to create a property on a javascript object that behaves similar to a property in C#.

示例：
我创建了一个自动使用dojo调整textarea小部件。为了从我的小部件中获取value属性，我已经连接到onchange事件，每次textarea的值发生变化时我都会设置一个变量。

Example: I've created an auto-sizing textarea widget using dojo. In order to get the "value" property out of my widget, I've hooked up to the onchange event and I'm setting a variable everytime the value of the textarea changes.

有没有办法在不连接onchange事件的情况下完成此任务。

Is there a way to accomplish this without hooking up to the onchange event.

编辑

换句话说，是否可以在JavaScript中写一些行为类似于getter和/或setter的内容。

In other words, is it possible to write something in JavaScript that behaves like getters and/or setters.

推荐答案

ECMAScript 5实现中可能包含所有主流浏览器的最新版本 。 ECMAScript 5规范增加了标准化的getter和setter。一个怪癖是IE 8具有此功能，但仅限于DOM节点。这就是语法：

It is possible in ECMAScript 5 implementations, which include recent versions of all major browsers. The ECMAScript 5 spec adds standardized getters and setters. One quirk is that IE 8 has this feature, but only on DOM nodes. This is what the syntax looks like:

var obj = {};

Object.defineProperty(obj, "value", {
    get: function () {
        return this.val;
    },
    set: function(val) {
        this.val = val;
    }
});

在Mozilla中也有一个专有的getter和setter实现很长一段时间了由WebKit和Opera采用，但这在IE中不可用。

There has also been a proprietary implementation of getters and setters in Mozilla for a long time that was also later adopted by WebKit and Opera but this is not available in IE.

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