This time I will bring you the progress bar of vue to implement page loading. What are the notes of vue to implement page loading progress bar? The following is a practical case. Let’s take a look. .
I first saw the page loading progress bar on YouTube, and later it can be seen on almost all major websites. It can prevent users from staring at a completely blank page when loading the page, improving the user experience.
But from a development perspective, it is really difficult to grasp the authenticity of this kind of progress bar, because we cannot count the progress until the logic code is loaded, and the progress of the logic code itself cannot be counted. In addition, it is impossible for us to monitor the loading of all resources.
In fact, users don't care what percentage of your page is loaded, but what they really care about is how long it is until it is fully loaded, and whether the blank page has not been fully loaded or is blank after loading. So we don't need to "simulate" a progress bar, use a fake animation effect to simulate loading before the back-end data is returned, and read the progress bar and hide it after the data is returned.
// progress-bar.vue <template> <transition> <p> </p> </transition> </template> <script> export default { data() { return { isShow: true, // 是否显示进度条 val: 0, // 进度 } }, props: { /** * 每10毫秒自增幅度 */ step: { type: Number, default: 5, }, /** * 初始值 */ initVal: { type: Number, default: 0, }, /** * 到一定进度停止 */ stopVal: { type: Number, default: 80, }, /** * 进度条继续到成功 */ isOk: { type: Boolean, default: false, }, }, mounted() { // 初始化后加载进度,加载到百分之多少由stopVal决定 this.val = this.initVal let step = this.step let timer = setInterval(() => { this.val = this.val + step this.$el.style.width = this.val + '%' // 父组件数据加载完前进度条最多到stopVal的这个百分值 if (this.val >= this.stopVal) { clearInterval(timer) return } }, 10) }, watch: { /** * 监听组件props变化决定是否继续加载,一般在父组件数据加载完后改变此标志位 */ isOk() { let val = this.val let step = this.step let timer = setInterval(() => { val = val + step this.$el.style.width = val + '%' // 加载到百分百完成 if (val >= 100) { // 关闭定时器 clearInterval(timer) // 加载完成关闭进度条 this.isShow = false // 加载完成的回调 this.$emit('callback', 'load success') return } }, 10) }, }, } </script> <style> .progress-bar { position fixed top 0 height 6px width 0 background-color #999 } .fade { &-enter-active, &-leave-active { transition: all .3s } &-enter, &-leave-active { opacity: 0 } } </style>
I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!
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The differences in performance and efficiency between Python and JavaScript are mainly reflected in: 1) As an interpreted language, Python runs slowly but has high development efficiency and is suitable for rapid prototype development; 2) JavaScript is limited to single thread in the browser, but multi-threading and asynchronous I/O can be used to improve performance in Node.js, and both have advantages in actual projects.

JavaScript originated in 1995 and was created by Brandon Ike, and realized the language into C. 1.C language provides high performance and system-level programming capabilities for JavaScript. 2. JavaScript's memory management and performance optimization rely on C language. 3. The cross-platform feature of C language helps JavaScript run efficiently on different operating systems.

JavaScript runs in browsers and Node.js environments and relies on the JavaScript engine to parse and execute code. 1) Generate abstract syntax tree (AST) in the parsing stage; 2) convert AST into bytecode or machine code in the compilation stage; 3) execute the compiled code in the execution stage.

The future trends of Python and JavaScript include: 1. Python will consolidate its position in the fields of scientific computing and AI, 2. JavaScript will promote the development of web technology, 3. Cross-platform development will become a hot topic, and 4. Performance optimization will be the focus. Both will continue to expand application scenarios in their respective fields and make more breakthroughs in performance.

Both Python and JavaScript's choices in development environments are important. 1) Python's development environment includes PyCharm, JupyterNotebook and Anaconda, which are suitable for data science and rapid prototyping. 2) The development environment of JavaScript includes Node.js, VSCode and Webpack, which are suitable for front-end and back-end development. Choosing the right tools according to project needs can improve development efficiency and project success rate.

Yes, the engine core of JavaScript is written in C. 1) The C language provides efficient performance and underlying control, which is suitable for the development of JavaScript engine. 2) Taking the V8 engine as an example, its core is written in C, combining the efficiency and object-oriented characteristics of C. 3) The working principle of the JavaScript engine includes parsing, compiling and execution, and the C language plays a key role in these processes.

JavaScript is at the heart of modern websites because it enhances the interactivity and dynamicity of web pages. 1) It allows to change content without refreshing the page, 2) manipulate web pages through DOMAPI, 3) support complex interactive effects such as animation and drag-and-drop, 4) optimize performance and best practices to improve user experience.

C and JavaScript achieve interoperability through WebAssembly. 1) C code is compiled into WebAssembly module and introduced into JavaScript environment to enhance computing power. 2) In game development, C handles physics engines and graphics rendering, and JavaScript is responsible for game logic and user interface.


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