Which browsers support Promise?

Browser compatibility: Which browsers support Promise?

As the complexity of web applications continues to increase, developers are eager to solve the problem of asynchronous programming in JavaScript. In the past, developers often used callback functions to handle asynchronous operations, but this resulted in code that was complex and difficult to maintain. To solve this problem, ECMAScript6 introduced Promise, which provides a more intuitive and flexible way to handle asynchronous operations.

Promise is an object used to handle asynchronous operations. It represents the final result of an asynchronous operation. Promise has three states: pending (in progress), fulfilled (successful) and rejected (failed). After a Promise object changes from the pending state to the fulfilled or rejected state, it will not change state again.

Because of the flexibility and practicality of Promise, most modern browsers now support Promise. The following will introduce some common browsers and explain their support for Promise.

1. Google Chrome: Starting from Chrome version 32, Chrome begins to support Promise. In newer versions, Chrome has good support for Promise and can use all Promise-related methods and features.
2. Mozilla Firefox: Starting from Firefox version 29, Firefox begins to support Promise. However, in early versions, Firefox's support for Promise was not complete, and some polyfill libraries may need to be used to be compatible with some Promise features.
3. Microsoft Edge: Starting from Edge 12 version, Edge begins to support Promise. Edge has good support for Promise and is compatible with most Promise features and methods.
4. Safari: Starting from Safari 7.1, Safari supports Promise. However, in early versions, Safari's support for Promise was very limited, and some polyfill libraries were needed to be compatible with Promise functionality.
5. Opera: Starting from Opera 19 version, Opera begins to support Promise. Similar to other modern browsers, Opera also has good support for Promise and can use all Promise-related methods and features.

In addition to the above browsers, there are some other browsers that also support Promise, such as UC Browser, QQ Browser, etc. It is worth noting that although most modern browsers support Promise, some older browsers may not support Promise. In this case, you can use some polyfill libraries or manually implement the Promise function.

To summarize, most mainstream browsers now support Promise. Using Promise can better handle asynchronous operations, making the code more concise, readable and maintainable. When writing web applications, try to use Promise to solve asynchronous programming problems to ensure the performance and reliability of the code.

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