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With the popularity and development of the Internet, JavaScript has become an indispensable part of web development. However, due to different implementation mechanisms of different browsers, JavaScript compatibility issues arise. Therefore, this article will introduce the problem of which browsers are compatible with JavaScript and provide some solutions.
First of all, we need to make it clear that all mainstream browsers (such as Chrome, Firefox, Safari, IE, etc.) support javascript. However, different browsers have different support levels and implementation mechanisms for JavaScript. Let’s take a closer look at each browser’s compatibility with JavaScript.
Chrome browser is one of the most widely used browsers, and it is also one of the browsers with the best compatibility with JavaScript. Almost all modern JavaScript features (such as ES6, Promise, async/await, etc.) are supported, and chrome DevTools provides flexible and powerful debugging tools to facilitate developers to debug.
Firefox browser is also one of the browsers that has good support for javascript. Unlike Chrome, Firefox's early support for JavaScript placed more emphasis on standards, especially in its latest Quantum engine, which greatly optimized JavaScript parsing and execution speed, improving its performance and stability.
Safari is a browser developed by Apple and is also the default browser on IOS systems. Safari's support for JavaScript is very comprehensive for Webkit-based browsers, and most JavaScript features and APIs are also covered. However, Safari is not perfect in implementing ES6, and some ES6 features still need to be implemented using polyfill or transpiler.
Although IE browser once had an absolute market share many years ago, and was the browser with the most JS compatibility issues for a long time, However, with the development of the browser market and technology, IE has gradually faded out of the mainstream market. The IE browser's support for JavaScript is still relatively limited, especially when it comes to implementing some new JavaScript features, which often require the use of hack technologies such as Polyfill or Shim to make up for it. At the same time, IE browser also has many problems in terms of security, performance, development experience, etc., so we should try to avoid using IE browser during the development process.
In fact, there are many browsers commonly used in Web front-end development. For example, Microsoft's newly launched Edge browser also performs well in supporting new features; the domestic 360 browser has average compatibility, but because of its unique core and features, it often encounters some strange problems.
According to the support and implementation mechanism of different browsers for JavaScript, we can solve the compatibility problem through the following means.
1. Use Polyfill
Polyfill is a special code that can simulate some new JavaScript features/functions/methods that are not supported by browsers to achieve compatibility.
2. Use Transpiler
Transpiler (decoder) can convert ES6 and above versions of JavaScript code into ES5 and below versions, so that it can run on lower version browsers .
3. Use prefix
Some browsers may support a new attribute or method, but this attribute or method needs to be preceded by the browser manufacturer's prefix (such as -moz-, - webkit-etc.) before it can be used. Therefore, pay attention to adding these prefixes when writing CSS.
4. Adaptation
In front-end development, if browser compatibility issues arise, they are usually for a certain CSS feature or some functions or methods. Developers can re- Write the corresponding code, or use an adapted tool or framework to fix it.
To sum up, different browsers have different compatibility levels with JavaScript, but we can solve the compatibility problem through some methods. During the development process, you should try to use the latest browsers and JavaScript features, and conduct sufficient testing and compatibility processing to ensure that the website or application runs normally under various browsers.
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