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Therefore, the developer tends to ask questions such as "What version of ECMAScript does this browser support?" Or what ECMAScript function does this browser support? They questioned whether Google, Mozilla, and Microsoft began updating the browser's JavaScript engine using the features described in the latest ECMAScript I thought. The JavaScript runtime is an "existing entity or system" mentioned in the script language definition. The code passes through the JavaScript engine, and when analyzed and understood, the entity or system performs the interpreted operation. A dog walks or runs, a character of a video game jumps (a wrecking ship in the case of the above image)

Let's start with history. This is a simple and complicated story. In 1995 there was a browser called the World Wide Web. In short, the browser has a URL link. Click this link to download it to your computer. Data is displayed in the browser and you can see it. Everyone knows that such a simple function had a big impact on us. Imagine the computer is a red box in front of the browser. I will talk about it later. If this red box is a computer, there are two things on the hard drive. There are two things in the world. One is called a program, and the other is called data. If you do not have internet, you need to install data and programs on your computer. On today's internet, you will notice Google's instant application or WeChat mini program. These programs can be executed just by clicking the button, there is no need to install them. This is very convenient. Is there a computer science major in the room?