


jquery implements Sina Weibo-like pop-up layer code with animated effects (can be closed and dragged)
This article mainly introduces the code of jQuery to implement a pop-up layer imitating Sina Weibo with animated effects. It has the functions of closing and dragging. It involves jQuery's response to mouse events and the transformation function of page element attributes. It has certain reference For reference value, friends who need it can refer to it, the details are as follows:
This is a jquery implementation of a pop-up layer with animation. It was originally designed to simulate the pop-up layer in Sina Weibo. Later, jQuery was introduced, and I wanted to After thinking for a while, I didn’t know how to add some animation effect, and then I wrote such a pop-up web page layer effect. After you click the button, you can see a pop-up layer that gradually emerges and can be closed. After clicking to close, of course, it will also gradually Disappears. When moving, the absolute position of the upper left corner of the control is calculated based on the mouse position. After releasing the mouse, it stops moving and returns to opacity.
A screenshot of the running effect is as follows:
The online demo address is as follows:
http://demo.jb51.net/ js/2015/jquery-f-sina-flash-style-close-able-dlg-demo/
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> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <script src="jquery-1.6.2.min.js" type="text/javascript"></script> <style type="text/css"> #t{ margin:30px 0 0 100px;} .cc { border:1px solid #000; position:absolute; top:60px; left:180px; height: 150px; width: 300px; display:none; } .cc h2{ display:block; width:270px; font-size:12px; float:left; text-align:center;} .cc span{ display:block; width:20px; height:20px; font-size:18px; float:right; border:1px solid #F00; background:#999; text-align:center;} </style> <script language="javascript"> $(function(){ var _move=false;//移动标记 var _x,_y;//鼠标离控件左上角的相对位置 $('#t').click( function(){ $('.cc').fadeIn('slow'); }); $('.cc span').click(function(){ $('.cc').hide('fast'); }) $('.cc').mousedown(function(e){ _move=true; _x=e.pageX-parseInt($(".cc").css("left")); _y=e.pageY-parseInt($(".cc").css("top")); $(".cc").fadeTo(20, 0.5).css('cursor','move');//点击后开始拖动并透明显示 }); $('.cc').mousemove(function(e){ if(_move){ var x=e.pageX-_x;//移动时根据鼠标位置计算控件左上角的绝对位置 var y=e.pageY-_y; $(".cc").css({top:y,left:x});//控件新位置 } }).mouseup(function(){ _move=false; $(".cc").fadeTo("fast", 1).css('cursor','auto');//松开鼠标后停止移动并恢复成不透明 }); }); </script> <title>新浪微博的弹出层效果</title> </head> <body> <input id="t" name="1" type="button" value="弹出层" /> <p class="cc"><h2 id="点击可以拖拽哦">点击可以拖拽哦</h2><span>X</span></p> </body> </html>
The above is the entire content of this chapter , for more related tutorials, please visit jQuery Video Tutorial!

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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.

The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.

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JavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.


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