How to handle the listening return event in Html5 implementation in APP
This article mainly introduces relevant information to you about the method examples of monitoring return event processing in Html5 APP. I hope it can help you. When using the MUI framework, we often use a class with .mui-action-back in the header.
<header class="mui-bar mui-bar-nav"> <a class="mui-action-back mui-icon mui-icon-left-nav mui-pull-left"></a> <h1 id="货物查询">货物查询</h1> </header>
Click on the return logo of the header to return to the previous page.
//以下是mui.js中的源码,可以看到,在点击返回的时候,内部做了以下的操作 //$.hook={}是专门用于记录浏览的历史的。 $.back = function() { if (typeof $.options.beforeback === 'function') { if ($.options.beforeback() === false) { return; } } $.doAction('backs'); }; $.doAction = function(type, callback) {//返回上一个记录 if ($.isFunction(callback)) { //指定了callback $.each($.hooks[type], callback); } else { //未指定callback,直接执行 $.each($.hooks[type], function(index, hook) { return !hook.handle(); }); } }; $.addAction = function(type, hook) {//添加历史记录 var hooks = $.hooks[type]; if (!hooks) { hooks = []; } hook.index = hook.index || 1000; hooks.push(hook); hooks.sort(function(a, b) { return a.index - b.index; }); $.hooks[type] = hooks; return $.hooks[type]; };
When we When encapsulating H5 into an APP, the 5+ interface we use has the concept of webview, which is a window.
At the beginning, I didn't deliberately distinguish between these two concepts, so sometimes I created a new window to open a web page, or sometimes I directly
jumped through the URL, such as: location.href.
This will lead to a situation when monitoring the back button of the mobile phone. The scenario is roughly as follows:
1. Open the software and enter the homepage (main.html=> ;HBuilder[webview]) [The former represents the local access path of the URL, and the latter is the ID of the window webview].
2. Jump to the login interface through location.href instead of opening it by creating a webview.
3. After logging in, enter the function page, press Return again, and return to the login page. The expectation is that after I log in, if I click the return button on my phone, I will log out directly. For this purpose, we specially learned about the MUI rollback function. We can implement it by overriding this method.
On the page that needs to be monitored:
mui.back=function(){ //写你监听返回键后需要做的操作
However, if Still following the previous two modes of web page jump and form creation, unexpected results will occur, that is, mui.back can only be monitored in the entry file, and monitoring done on other pages or forms will not be triggered. All are captured by the listening event mui.back of the entry file, and only the listening business logic of the entry file will be executed. This leads to the embarrassing situation of returning to the previous page without customizing the return event: for example After returning to the login page and customizing the return event, I found that all events were monitored by the entry file. This means that it makes no sense to write mui.back=function(){} on other pages.
If all jump pages are opened as forms, the above problems will not occur. Each window can normally listen to the mui.back custom function.
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There is no difference between HTML5 and H5, which is the abbreviation of HTML5. 1.HTML5 is the fifth version of HTML, which enhances the multimedia and interactive functions of web pages. 2.H5 is often used to refer to HTML5-based mobile web pages or applications, and is suitable for various mobile devices.

HTML5 is the latest version of the Hypertext Markup Language, standardized by W3C. HTML5 introduces new semantic tags, multimedia support and form enhancements, improving web structure, user experience and SEO effects. HTML5 introduces new semantic tags, such as, ,, etc., to make the web page structure clearer and the SEO effect better. HTML5 supports multimedia elements and no third-party plug-ins are required, improving user experience and loading speed. HTML5 enhances form functions and introduces new input types such as, etc., which improves user experience and form verification efficiency.

How to write clean and efficient HTML5 code? The answer is to avoid common mistakes by semanticizing tags, structured code, performance optimization and avoiding common mistakes. 1. Use semantic tags such as, etc. to improve code readability and SEO effect. 2. Keep the code structured and readable, using appropriate indentation and comments. 3. Optimize performance by reducing unnecessary tags, using CDN and compressing code. 4. Avoid common mistakes, such as the tag not closed, and ensure the validity of the code.

H5 improves web user experience with multimedia support, offline storage and performance optimization. 1) Multimedia support: H5 and elements simplify development and improve user experience. 2) Offline storage: WebStorage and IndexedDB allow offline use to improve the experience. 3) Performance optimization: WebWorkers and elements optimize performance to reduce bandwidth consumption.

HTML5 code consists of tags, elements and attributes: 1. The tag defines the content type and is surrounded by angle brackets, such as. 2. Elements are composed of start tags, contents and end tags, such as contents. 3. Attributes define key-value pairs in the start tag, enhance functions, such as. These are the basic units for building web structure.

HTML5 is a key technology for building modern web pages, providing many new elements and features. 1. HTML5 introduces semantic elements such as, , etc., which enhances web page structure and SEO. 2. Support multimedia elements and embed media without plug-ins. 3. Forms enhance new input types and verification properties, simplifying the verification process. 4. Offer offline and local storage functions to improve web page performance and user experience.

Best practices for H5 code include: 1. Use correct DOCTYPE declarations and character encoding; 2. Use semantic tags; 3. Reduce HTTP requests; 4. Use asynchronous loading; 5. Optimize images. These practices can improve the efficiency, maintainability and user experience of web pages.

Web standards and technologies have evolved from HTML4, CSS2 and simple JavaScript to date and have undergone significant developments. 1) HTML5 introduces APIs such as Canvas and WebStorage, which enhances the complexity and interactivity of web applications. 2) CSS3 adds animation and transition functions to make the page more effective. 3) JavaScript improves development efficiency and code readability through modern syntax of Node.js and ES6, such as arrow functions and classes. These changes have promoted the development of performance optimization and best practices of web applications.


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