What does native javascript mean?

Native javascript refers to javascript that follows the ECMAscript standard. Unlike Microsoft's jscript, it does not depend on any framework and relies on the scripting language of the browser's standard engine.

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

JavaScript is a scripting language that runs on the browser side. JavaScript mainly solves the problem of front-end interaction with users, including usage interaction and data interaction. JavaScript is interpreted and executed by the browser. Front-end scripting languages ​​include JScript (Microsoft, unique to IE), ActionScript (Adobe company, requires a plug-in), etc.

Native JavaScript:

Native JS refers to javascript that follows the ECMAscript standard. Unlike Microsoft's jscript, it does not depend on any framework and relies on the browser standard engine. Scripting language.

The meaning of native JavaScript:

jquery is a framework resource integrated on the original js. Using jquery does not mean that the code is not written by you. The difference lies in the use jquery just uses its syntax, which is more conducive to compatibility and implementation. jquery has solved conventional js compatibility issues, so there will be fewer incompatibilities when used, and it is more conducive to development.

But at the same time, you also need to learn the relevant syntax to use frameworks such as jquery. Students with a basic knowledge of js will find it easy to learn jquery and find it very convenient when using it.
js actually contains three parts: dom document object model, bom browser object model, ecmascript syntax abbreviation (es)

Our effect implementation is actually to use es syntax to operate dom and bom to achieve our purpose A picture shows that our js processing method is quite clear. It can be seen that dom and bom serve as bridges to realize the combination of html pages and es. When you use jquery to achieve something, you will know how important native is.

If you don’t learn native JS, how can you understand the framework? The same function written by two people with different frameworks. If you have not learned these two frameworks, you can only look at the native JS logic code and find the "laws" of this framework to learn this framework.

For example, if a web front-end beginner has just joined a company, but has not learned the framework, his senior will give him a semi-finished project, or someone has made jq before, which is a framework, which contains various components encapsulated in native js. kind of function.

(1) jquery does not split modules and can only import them all. In actual development, we often only need certain functions, not all of jq, so a problem arises. For example, we only want to use jq's $("#id") function to obtain a dom element, but we introduced The jq package is 91kB (compressed), which has a great impact on the loading speed of the page. Especially for portal websites, which are very rich in pictures and other resources, every 1kb is very important.

(2) jquery itself is also a library developed by developers to improve efficiency. Subjectively speaking, it is very helpful for developers to improve themselves, because to encapsulate a relatively complete library requires more than a very good library. JS basics and a wide range of knowledge, including object-oriented, modular, and different implementations of various large and small JS APIs and browsers.

It is not a recommended development model but an alternative way to improve efficiency. During development, when we encounter many functions that are not encapsulated by js, we need to develop them immediately or import previously developed small libraries. jq is just a simple library for senior front-end engineers, and senior front-end engineers also have the ability to develop their own libraries and customize more complete functions.

[Recommended learning: javascript advanced tutorial]

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