JS implements the link text prompt box effect that follows the mouse
This article mainly introduces the JS implementation of the link text prompt box effect that follows the mouse, involving related techniques of javascript mouse events and page element style operations. It is very simple and practical. Friends who need it can refer to it. The details are as follows:
JavaScript and CSS are used here to achieve the link prompt effect. It will not change your original link structure. It is implemented using the original title tag of the link. If you used the title tag before, you almost only need to copy the JS code to Just go to your web page. You will find that after running this effect, if the mouse moves on the link, the text prompt box will move with the mouse.
The operation effect is shown in the figure below:
The specific code is as follows:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>跟随鼠标的文字提示框</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <style type="text/css"> body{font:12px/1.8 arial;} a,a:visited{color:#3366cc;text-decoration:none;} a:hover{color:#f60;text-decoration:underline;} .tip{width:200px;border:2px solid #ddd;padding:8px;background:#f1f1f1;color:#666;} img{border:none;} </style> <script type="text/javascript"> var tip={$:function(ele){ if(typeof(ele)=="object") return ele; else if(typeof(ele)=="string"||typeof(ele)=="number") return document.getElementById(ele.toString()); return null; }, mousePos:function(e){ var x,y; var e = e||window.event; return{x:e.clientX+document.body.scrollLeft+document.documentElement.scrollLeft, y:e.clientY+document.body.scrollTop+document.documentElement.scrollTop}; }, start:function(obj){ var self = this; var t = self.$("mjs:tip"); obj.onmousemove=function(e){ var mouse = self.mousePos(e); t.style.left = mouse.x + 10 + 'px'; t.style.top = mouse.y + 10 + 'px'; t.innerHTML = obj.getAttribute("tips"); t.style.display = ''; }; obj.onmouseout=function(){ t.style.display = 'none'; }; } } </script> </head> <body> <ol> <li><a href="#" target="_blank" onmouseover="tip.start(this)" tips="2013年12月14日,嫦娥3号卫星登上月球,激动人心的一切终于到来了……">中国嫦娥飞天的一些感想</a></li> <li><a href="#" target="_blank" onmouseover="tip.start(this)" tips="中国未来一定是世界上最强大的国家,你相信么?">中国是世界上最强大的国家</a></li> </ol> <p id="mjs:tip" class="tip" style="position:absolute;left:0;top:0;display:none;"></p> </body> </html>
The above is the entire content of this chapter, more For related tutorials, please visit JavaScript Video Tutorial, CSS Video Tutorial!

JavaScript is widely used in websites, mobile applications, desktop applications and server-side programming. 1) In website development, JavaScript operates DOM together with HTML and CSS to achieve dynamic effects and supports frameworks such as jQuery and React. 2) Through ReactNative and Ionic, JavaScript is used to develop cross-platform mobile applications. 3) The Electron framework enables JavaScript to build desktop applications. 4) Node.js allows JavaScript to run on the server side and supports high concurrent requests.

Python is more suitable for data science and automation, while JavaScript is more suitable for front-end and full-stack development. 1. Python performs well in data science and machine learning, using libraries such as NumPy and Pandas for data processing and modeling. 2. Python is concise and efficient in automation and scripting. 3. JavaScript is indispensable in front-end development and is used to build dynamic web pages and single-page applications. 4. JavaScript plays a role in back-end development through Node.js and supports full-stack development.

C and C play a vital role in the JavaScript engine, mainly used to implement interpreters and JIT compilers. 1) C is used to parse JavaScript source code and generate an abstract syntax tree. 2) C is responsible for generating and executing bytecode. 3) C implements the JIT compiler, optimizes and compiles hot-spot code at runtime, and significantly improves the execution efficiency of JavaScript.

JavaScript's application in the real world includes front-end and back-end development. 1) Display front-end applications by building a TODO list application, involving DOM operations and event processing. 2) Build RESTfulAPI through Node.js and Express to demonstrate back-end applications.

The main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.

Understanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.

Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.

Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.


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