Pop-up layer plug-in
String.prototype.replaceAll = function(s1,s2){ return this.replace(new RegExp(s1,"gm"),s2); }; (function($){ /* * $-layer 0.1 - jquery pulg-in * * Copyright (c) 2008 King Wong * $Date: 2008-09-28 $ */ var ___win___ = window.self; var ___self___ = window.self; var ___id___ = ""; var ___settings___ = {}; var isMouseDown = false; var currentElement = null; var dropCallbacks = {}; var dragCallbacks = {}; var bubblings = {}; var lastMouseX; var lastMouseY; var lastElemTop; var lastElemLeft; var dragStatus = {}; var holdingHandler = false; $.getMousePosition = function(e){ var posx = 0; var posy = 0; if (!e) var e = window.event; if (e.pageX || e.pageY) { posx = e.pageX; posy = e.pageY; } else if (e.clientX || e.clientY) { posx = e.clientX + document.body.scrollLeft + document.documentElement.scrollLeft; posy = e.clientY + document.body.scrollTop + document.documentElement.scrollTop; } return { 'x': posx, 'y': posy }; }; $.updatePosition = function(e) { var pos = $.getMousePosition(e); var spanX = (pos.x - lastMouseX); var spanY = (pos.y - lastMouseY); var _top = (lastElemTop + spanY) > 0 ? (lastElemTop + spanY) : 0; var _left = (lastElemLeft + spanX) > 0 ? (lastElemLeft + spanX) : 0; $("#"+___id___,___win___.document).css("top", _top); $("#"+___id___,___win___.document).css("left", _left); }; $.fn.ondrag = function(callback){ return this.each(function(){ dragCallbacks[this.id] = callback; }); }; $.fn.ondrop = function(callback){ return this.each(function(){ dropCallbacks[this.id] = callback; }); }; $.fn.dragOff = function(){ return this.each(function(){ dragStatus[this.id] = 'off'; }); }; $.fn.dragOn = function(){ return this.each(function(){ dragStatus[this.id] = 'on'; }); }; $.extend({ layerSettings:{ id:"layerdiv", target:window.self, width:220, height:220, templete:'<div style="height:20px; width:@width@px; background-color:#777777;"><span id="@moveid@" style="position:relative; left:0px; top:0px; height:20px; width:100px;"><span id="@titleid@">@title@</span></span><span class="layerclose" style="position:relative; top:0px; float:right; right:20px; color:red;">close</span></div><div style="border:solid #ff0000 1px; width:@width@px; height:@height@px;"><div style="width:100%; height:100%; background-color:#ffffff;" id="@contentid@"></div></div>', cssurl:'', content:'', title:'', isbg:true, opacity:0.3 }, layerSetup: function( settings ) { $.extend( $.layerSettings, settings ); ___settings___[settings.id] = settings; ___id___ = settings.id; }, layershow:function(){ ___win___ = $.layerSettings.target == undefined || $.layerSettings.target == null ? window.self : $.layerSettings.target; var win = $.layerSettings.target == undefined || $.layerSettings.target == null ? window.self : $.layerSettings.target; var __bw = $("body",win.document).width(); var __bh = $("body",win.document).height() > $(window).height() ? $("body",win.document).height() : $(window).height(); var _width = $.layerSettings.width; var _height = $.layerSettings.height; if(___win___.document.getElementById(___id___)) return; var _moveid = ___id___ + "_move"; var _titleid = ___id___ + "_title"; var _contentid = ___id___ + "_content"; var _cssurl = $.layerSettings.cssurl; var opacity = $.layerSettings.opacity; (function(){ $("head",win.document).append('<link type="text/css" href="'+_cssurl+'" rel="stylesheet" />'); })(); __index = $.layermaxindex(); var __left = (__bw - _width) > 0 ? (__bw - _width)/2 : 0; var __top = 100; var __bgDiv = '<div id="'+___id___+'_background" style="background:#000000; filter:alpha(opacity='+(opacity*100)+'); opacity: '+opacity+'; width:'+__bw+'px; height:'+__bh+'px; z-index:'+(__index++)+'; position:absolute; left:0px; top:0px;"></div>'; if($.layerSettings.isbg) { $("body",win.document).append(__bgDiv); } $("body",win.document).append('<div id="'+___id___+'" style="z-index:'+__index+';position:absolute; left:'+__left+'px; top:'+__top+'px;"></div>'); var _templete = $.layerSettings.templete; var __templete = _templete.replaceAll("@width@",_width).replaceAll("@height@",_height).replaceAll("@titleid@",_titleid).replaceAll("@contentid@",_contentid).replaceAll("@title@",jQuery.layerSettings.title).replaceAll("@moveid@",_moveid); $("#"+___id___,win.document).append(__templete); $("#"+_contentid,win.document).append($.layerSettings.content); var self = window.self; var ___win = $.layerSettings.target.document; var idd = ___id___; $(".layerclose",win.document).bind("click",function() { self.$.layerclose(idd,___win); }); $("#"+___id___,win.document).bind("click",function() { var id = this.id; self.$.layerSetup(___settings___[id]); self.$(this).css("z-index",$.layermaxindex()); }); $(win.document,win).bind("click",function(e) { var pos = self.$.getMousePosition(e); }); $(win.document,win).mousemove(function(e){ if(isMouseDown && dragStatus[currentElement.id] != 'false'){ self.$.updatePosition(e); if(dragCallbacks[currentElement.id] != undefined){ dragCallbacks[currentElement.id](e, currentElement); } return false; } }); $(win.document,win).mouseup(function(e){ if(isMouseDown && dragStatus[currentElement.id] != 'false'){ isMouseDown = false; if(dropCallbacks[currentElement.id] != undefined){ dropCallbacks[currentElement.id](e, currentElement); } return false; } }); (function(){ bubblings[___id___] = true; dragStatus[___id___] = "on"; //setHandler bubblings[this.id] = true; dragStatus[_moveid] = "handler"; $("#"+_moveid,win.document).css("cursor", "move"); $("#"+_moveid,win.document).mousedown(function(e){ var id = this.id.replace("_move",""); ___id___ = id; self.$("#"+id,win.document).css("z-index",$.layermaxindex()); self.$.layerSetup(___settings___[id]); if((dragStatus[___id___] == "off") || (dragStatus[___id___] == "handler" && !holdingHandler)) return bubblings["#"+___id___]; isMouseDown = true; currentElement = self.$("#"+___id___); var pos = self.$.getMousePosition(e); lastMouseX = pos.x; lastMouseY = pos.y; lastElemTop = win.document.getElementById(___id___).offsetTop; lastElemLeft = win.document.getElementById(___id___).offsetLeft; self.$.updatePosition(e); holdingHandler = true; }); $("#"+_moveid,win.document).mouseup(function(e){ holdingHandler = false; }); //end setHandler })(); }, layerclose:function(__id,__win) { $("#"+__id+"_background",__win).remove(); $("#"+__id,__win).remove(); }, layermaxindex:function() { var ___index = 0; $.each($("*",___win___.document),function(i,n){ var __tem = $(n).css("z-index"); if(__tem>0) { if(__tem > ___index) { ___index = __tem + 1; } } }); return ___index; } }); })(jQuery);
Usage:
$.layerSetup({ id:"弹出层的ID", title:'弹出层的标题文字', target:在哪个目标柜架弹出层如window.parent,默认为window.self, cssurl:'弹出层的CSS样式文件的地址', content:'弹出的内容', isbg:是否显示一个遮照层, templete:'为层设置布局模板如:<div class="showwint_mini_title"><span class="showwint_mini_close_btn"><a href="javascript:void(null);" class="layerclose"></a></span><span class="showwint_mini_title_content" id="@moveid@"><span id="@titleid@"></span></span></div><div class="showwint_mini_content"><div class="showwint_mini_content_content" id="@contentid@"></div></div>', opacity:设置遮照层的透明度, width:宽, height:高 }); $.layershow();
The "@titleid@", "@moveid@", "@contentid" in the layout template @", "@width@", "@height@" are used to place the title ID, drag ID, content ID, width, height, etc. in the template. They can be placed in different locations according to the template you design.

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.

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.

Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.


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