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该新特性属于 ECMAScript 2015（ES6）规范，在使用时请注意浏览器兼容性。
Summary
Promise.prototype 属性表示 Promise 构造器的原型.
Promise.prototype 属性的属性特性： |
|
|---|---|
| writable | false |
| enumerable | false |
| configurable | false |
Description
Promise 实例继承自 Promise.prototype. 你可以用构造器的原型对象来添加属性或方法到所有 Promise 实例上.
Properties
-
Promise.prototype.constructor -
返回创建了实例原型的函数. 默认为
Promise函数.
Methods
-
Promise.prototype.catch(onRejected) - 添加一个否定(rejection) 回调到当前 promise, 返回一个新的promise。如果这个回调被调用，新 promise 将以它的返回值来resolve，否则如果当前promise 进入fulfilled状态，则以当前promise的肯定结果作为新promise的肯定结果.
-
Promise.prototype.then(onFulfilled, onRejected) - 添加肯定和否定回调到当前 promise, 返回一个新的 promise, 将以回调的返回值 来resolve.
Specifications
| Specification | Status | Comment |
|---|---|---|
| ECMAScript 2015 (6th Edition, ECMA-262) Promise.prototype |
Standard | Initial definition. |
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | 32 | 24.0 (24.0) as Future25.0 (25.0) as Promise behind a flag[1]29.0 (29.0) by default |
未实现 | 19 | 7.1 |
| Feature | Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile | Chrome for Android |
|---|---|---|---|---|---|---|
| Basic support | 未实现 | 24.0 (24.0) as Future25.0 (25.0) as Promise behind a flag[1]29.0 (29.0) by default |
未实现 | 未实现 | iOS 8 | 32 |
[1] Gecko 24 has an experimental implementation of Promise, under the initial name of Future. It got renamed to its final name in Gecko 25, but disabled by default behind the flag dom.promise.enabled. Bug 918806 enabled Promises by default in Gecko 29.