An article about the relationship between JavaScript and ECMAScript
JS and ES
Every student who studies JS has heard of ES5 and ES6, but have all the students cleared it? Do you know the relationship between them? We usually think that these two are the same thing. In fact, their relationship is as follows: 
From the above figure, we can clearly see that they are not a parallel relationship, but an inclusive relationship, so the following is Let me introduce the
ECMAScript
core respectively. It does not have input and output definitions, and there is no dependency between this language and the browser. The browser only provides the language hosting environment, as well as the implementation of the language and some localized extensions.
Since the browser is the host environment, there are other host environments: such as Node, such as Adobe Flash
ECMAScript stipulates this language:
- Grammar
- Type
- Statement
- Keyword
- Reserved word
- Operator
- Object
This means that we can also write a language as an implementation of ECMAScript, just like JavaScript. We only need to:
- Support all types of value object attribute functions described by ECMAScript As well as program syntax and semantics
- Support Unicode
Note:
- JSON objects are supported by native ECMAScript
DOM Document Object Model
In the browser, DOM implemented based on ECMAScript has become an important part of the JS language
DOM is described through HTML, a tree of page elements The structure object is the following thing: 
We need to pay attention to the following concepts:
- DOM is a standard, which specifies how to use HTML to Mapping objects to simplify the operation of each node expressed in HTML
- The relationship between ECMAScript and DOM is: the browser implements the DOM standard in a language that conforms to the ECMAScript standard
- You can use other Language implementation DOM
DOM stipulates the following things:
- HTML mapping objects, object operations
- Mouse, user events, etc.
- CSS style interface
- Interface for traversing the document tree
BOM browser object model
The DOM object is in the page, using HTML The mapping of written elements, and the BOM object is the mapping of the browser object. Through the BOM, we can and are not limited to the following things:
- Pop up a new window
- Move Zoom and close the browser
- Support cookies
- Get the window or navigator object
The current BOM standard is only available in HTML5, so in each browser before The support for BOM functions is different. With HTML5, BOM will be truly unified one day in the future.
ES6
ES6 has been officially released in June 2015
Various websites for ES6 The level of syntax support is different
If you need to check the host environment's support for ES6, you can use the tool
- If you need to check the browser's support for ES6, you can visit the web page
If you don’t want to face the problem of ES6 compatibility in different host environments, you can use the ES6 to ES5 converter Babel or Traceur
Recommended related tutorials: JavaScriptVideoTutorial
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