What is the operating mechanism of vue?

Vue is a popular JavaScript framework. Its operating mechanism can be divided into three parts: initialization, compilation and execution.

Initialization

During the initialization process of Vue, the component will be instantiated (Instance). Vue components are the most basic unit in the Vue framework and are the basic building blocks of Vue applications.

During the initialization phase, Vue will check whether there are specific configuration options in the component, such as data, methods, computed, etc. These configuration options will be packaged by Vue into responsive data or listenable functions. . At the same time, Vue will also perform some preprocessing on the components, such as processing user-defined instructions, communication between components, etc.

Compilation

The compilation process of Vue is based on virtual DOM (Virtual DOM). Vue's virtual DOM is an abstracted JavaScript object tree, which is equivalent to the Virtual DOM in React and is used to optimize the performance of DOM operations.

In the compilation phase, Vue will convert the component's template (Template) into a virtual DOM, and then identify, analyze and modify it. During this process, Vue will also convert the typed template syntax (Template Syntax) into JavaScript syntax, which is one of the most powerful features of the Vue framework.

Vue’s template syntax is similar to HTML syntax, but very different. In Vue's template syntax, you can use various instructions and expressions, such as v-model, v-if, v-else and other instructions, as well as expressions such as {{ }} and v-bind. These instructions and expressions are compiled into a function and return the resulting virtual DOM node.

Run

In the running phase of Vue, Vue will convert the virtual DOM into a real DOM and render it into the page. Vue uses an efficient algorithm that can only update the DOM nodes that need to be updated without re-rendering the entire page, which greatly improves the performance of Vue applications.

At the same time, Vue will also monitor data changes. When the data changes, Vue will re-render according to the responsive principle.

Summary

The running mechanism of the Vue framework can be summarized into three stages: initialization, compilation and operation. In the initialization phase, Vue will instantiate the component; in the compilation phase, Vue will convert the component's template into a virtual DOM, and use instructions and expressions to compile it into JavaScript syntax; in the running phase, Vue will Convert virtual DOM to real DOM, render it into the page, and listen for data changes. The efficient operating mechanism of the Vue framework is an important reason why Vue has become a popular JavaScript framework.

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