Which browsers support the Promise feature?

Which browsers can use the Promise feature?

With the development of web applications and the increasing demand for asynchronous operations, JavaScript's asynchronous programming method is becoming more and more important. Although the traditional callback function method can meet basic asynchronous programming needs, its problems such as too deep nesting level and poor code readability are gradually exposed. To solve these problems, Promise was introduced as a new asynchronous programming solution.

Promise itself is a JavaScript object, which represents the final result of an asynchronous operation. A Promise can be in one of three states: pending, fulfilled, and rejected. The Promise object can change the status to completed by calling the resolve() method, or change the status to rejected by calling the reject() method. At the same time, the Promise object also provides the then() method and the catch() method, which are callback functions used to handle the completed status and rejected status respectively.

For different browsers, Promise support is different. In the past, different browsers had low support for Promise, but with the release of the ECMAScript 6 (ES6) standard, Promise has become part of ES6 and is supported by more and more browsers.

In modern web browsers, many mainstream browsers already support the Promise feature. The following is the Promise support of some mainstream browsers:

1. Chrome: Since 2016, the Chrome browser has fully supported the Promise feature.
2. Firefox: Since 2014, the Firefox browser has supported Promise features, including the core features of ES6 Promise.
3. Safari: Since 2015, the Safari browser has supported the ES6 Promise feature.
4. Edge: Since 2015, the Microsoft Edge browser has supported Promise features, including the core features of ES6 Promise.
5. Opera: Since 2015, the Opera browser has supported the Promise feature.

In addition to the above-mentioned mainstream browsers, some other older browsers also provide support for Promise, but some polyfill or shim libraries may need to be introduced to achieve full Promise feature support. Some commonly used polyfill libraries include ES6-Promise and bluebird.

To sum up, modern web browsers basically support the Promise feature. Using Promise can help developers better perform asynchronous programming and improve code readability and maintainability. Therefore, when doing web development, developers can use Promise features with confidence and choose the appropriate browser environment according to their own needs.

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