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JavaScript 的性能优化：加载和执行

概览无论当前JavaScript代码是内嵌还是在外链文件中，页面的下载和渲染都必须停下来等待脚本执行完成。JavaScript执行过程耗时越久，浏览器等待响应用户输入的时间就越长。浏览器在下载和执行脚本时出现阻塞的原因在于，脚本可能会改变页面或JavaScript的命名空间，它们对后面页面内容造成影响。一个典型的例子就是在页面中使用document.write()。例如清单1清单1JavaScript代码内嵌示例Sou</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-29 22:50:45</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2416</span></span>  </p> </article><article class="excerpt"> <header> <a title="Javascript" class="label label-important zj-del-target" href="/category/66">Javascript<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/11068" title="(IBM)最大限度利用 JavaScript 和 Ajax 性能" target="_blank" onclick="return recordId('tid',66)">(IBM)最大限度利用 JavaScript 和 Ajax 性能 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11068" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/14.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/11068';}else{window.open('/article/11068');}" style="cursor: pointer;">简介在web早期，优化web页面的性能通常意味着避免了使用不必要的HTML标记，将JavaScript代码量控制到最小，并尽量减小所有图片文件大小，否则上网冲浪者会走开去泡杯咖啡来等待页面加载。web各个方面的改进也意味着我们现在面临新的性能考虑。尽管DSL和宽带为很多人提供了对Internet上更多内容的高速访问，我们对加载时间和响应的期望也在发展，希望在页面上执行操作后能立刻得到结果。AsynchronousJavaScriptandXML(Ajax)</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-12 09:29:30</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2416</span></span>  </p> </article><article class="excerpt"> <header> <a title="Javascript" class="label label-important zj-del-target" href="/category/66">Javascript<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/11018" title="用 JavaScript 创建模块化的交互用户界面" target="_blank" onclick="return recordId('tid',66)">用 JavaScript 创建模块化的交互用户界面 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11018" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/5.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/11018';}else{window.open('/article/11018');}" style="cursor: pointer;">级别：中级GregTravis,软件工程师2008年10月28日通过本文，了解使用拖放功能移动Web页面的不同部分的技巧。分别实现交互性的不同方面，然后再将它们组合在一起，这样便于灵活定制页面，也让您的Web用户非常满意。JavaScript是一种功能强大的语言，可用于创建基于Web的应用程序。它已经足够稳定和成熟，完全可以创建与传统桌面应用程序相抗衡的程序，因为后者在稳定性和特性丰富性方面都要胜出一筹。但JavaScript最初只是用来向静态Web页面添</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-12 09:29:29</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2416</span></span>  </p> </article><article class="excerpt"> <header> <a title="Javascript" class="label label-important zj-del-target" href="/category/66">Javascript<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/11029" title="Javascript 操作select控件大全（新增、修改、" target="_blank" onclick="return recordId('tid',66)">Javascript 操作select控件大全（新增、修改、 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11029" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/20.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/11029';}else{window.open('/article/11029');}" style="cursor: pointer;">Javascript操作select控件大全（新增、修改、删除、选中、清空、判断存在等）Postedon2007-08-0814:56礼拜一阅读(14918)评论(28)编辑收藏网摘所属分类:JavaScript1判断select选项中是否存在Value="paraValue"的Item2向select选项中加入一个Item3从select选项中删除一个Item4删除select中选中的项5修改select选项中value="paraValu</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-12 09:29:29</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2416</span></span>  </p> </article><article class="excerpt"> <header> <a title="Javascript" class="label label-important zj-del-target" href="/category/66">Javascript<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/539" title="Javascript的声明" target="_blank" onclick="return recordId('tid',66)">Javascript的声明 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/539" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/10.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/539';}else{window.open('/article/539');}" style="cursor: pointer;">Quiz下面Javascript代码为什么能运行？hello();functionhello(){alert("Hello,world!");}但对于C，这么写会报错：#include"stdio.h"voidmain(){hello();}voidhello(){printf("Hello,world\n");}由于hello没有被预先声明，代码“hello()”被认为是隐式声明，而隐式声明返回类型是int，所以提示hello类型错误。通过预先声明或者将</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-12 01:32:08</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2416</span></span>  </p> </article><article class="excerpt"> <header> <a title="Javascript" class="label label-important zj-del-target" href="/category/66">Javascript<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/420" title="Javascript图像处理——阈值" target="_blank" onclick="return recordId('tid',66)">Javascript图像处理——阈值 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/420" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/15.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/420';}else{window.open('/article/420');}" style="cursor: pointer;">前言上一篇文章，我们讲解了图像处理中的亮度和对比度的变化，这篇文章我们来做一个阈值函数。最简单的图像分割方法阈值是最简单的图像分割方法。比如为了从下图中分割出苹果，我们利用前景与背景的灰度差值，通过设定一个阈值，对于该像素大于这个阈值时就以黑色表示，小于便以灰色表示。五种阈值类型和OpenCV一样，我们将提供五种阈值类型，方便使用。下面是原图像的波形表示，纵坐标表示像素点的灰度值大小，蓝线是阈值大小。二进制阈值化公式表示是：图像表示是：可见超过该阈值的就变</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-12 01:32:03</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2416</span></span>  </p> </article><article class="excerpt"> <header> <a title="Javascript" class="label label-important zj-del-target" href="/category/66">Javascript<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/17143" title="JavaScript递归" target="_blank" onclick="return recordId('tid',66)">JavaScript递归 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/17143" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/9.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/17143';}else{window.open('/article/17143');}" style="cursor: pointer;">ServerSideJavaScriptwithASPcode/**//***ClassNavigator*@authorKimSoft*@versionbuild2006-07-0917:46*@copyright2006KimSoftAllRightsReserved.*/functionNavigator(boardId)...{this._boardId=boardId;this._db=$singleton(function()...{retur</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-29 22:50:07</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2415</span></span>  </p> </article><article class="excerpt"> <header> <a title="Javascript" class="label label-important zj-del-target" href="/category/66">Javascript<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/16957" title="使用纯javascript通过className来获取元素（ge" target="_blank" onclick="return recordId('tid',66)">使用纯javascript通过className来获取元素（ge </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/16957" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/2.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/16957';}else{window.open('/article/16957');}" style="cursor: pointer;">MarkFinklesuggestedthatIdosomespeedtesting,nowthatanativeimplementationofgetElementsByClassNamehaslandedintheMozillatrunk(destinedforFirefox3).SoIwentaroundanddugupallofthedifferent,existing,implementationsthatIcouldfind.Currently</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-29 22:47:45</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2415</span></span>  </p> </article><article class="excerpt"> <header> <a title="Javascript" class="label label-important zj-del-target" href="/category/66">Javascript<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/14012" title="eclipse Errors running builder 'JavaScript V" target="_blank" onclick="return recordId('tid',66)">eclipse Errors running builder 'JavaScript V </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/14012" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/12.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/14012';}else{window.open('/article/14012');}" style="cursor: pointer;">跑java程序时提示错误：Errorsoccurredduringthebuild.Errorsrunningbuilder'JavaScriptValidator'onproject'......'.java.lang.NullPointerException导致计算机运行速度很慢，因此想取消关于js校验的工作。提高eclipse运行的速度。解决方法：项目—-右键Properties—-Builders—-取消“JavaScriptValidator”e</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-29 22:10:45</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2415</span></span>  </p> </article><article class="excerpt"> <header> <a title="Javascript" class="label label-important zj-del-target" href="/category/66">Javascript<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/13836" title="JavaScript 计时器,倒计时" target="_blank" onclick="return recordId('tid',66)">JavaScript 计时器,倒计时 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/13836" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/16.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/13836';}else{window.open('/article/13836');}" style="cursor: pointer;">先看效果//列表的的效果//单个效果varbjtimer={sysTime:0,//服务器时间毫秒数timeBodyName:"timecontainer",//显示时间的容器timeBodyTag:"div",showFmt:"dd天HH时mm分ss秒",notstartMsg:"即将开始:",startingMsg:"剩余时间:",afterStart:"活动进行中",//开始后的内容afterEnd:"活动已结束",//结束后是否设置提示内容stim</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-29 22:08:39</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2414</span></span>  </p> </article><article class="excerpt"> <header> <a title="Javascript" class="label label-important zj-del-target" href="/category/66">Javascript<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/3235" title="腾讯的一道JavaScript面试题" target="_blank" onclick="return recordId('tid',66)">腾讯的一道JavaScript面试题 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/3235" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/6.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/3235';}else{window.open('/article/3235');}" style="cursor: pointer;">//题目：分别弹出什么内容？从CSDN看到的，分享一下腾讯的一道JavaScript面试题</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-12 01:33:14</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2406</span></span>  </p> </article><article class="excerpt"> <header> <a title="Javascript" class="label label-important zj-del-target" href="/category/66">Javascript<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/13772" title="javascript 身份证及电话号码验证" target="_blank" onclick="return recordId('tid',66)">javascript 身份证及电话号码验证 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/13772" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/11.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/13772';}else{window.open('/article/13772');}" style="cursor: pointer;">//这个可以验证15位和18位的身份证，并且包含生日和校验位的验证。//如果有兴趣，还可以加上身份证所在地的验证，就是前6位有些数字合法有些数字不合法。functionisIdCardNo(num){num=num.toUpperCase();//身份证号码为15位或者18位，15位时全为数字，18位前17位为数字，最后一位是校验位，可能为数字或字符X。if(!(/(^\d{15}$)|(^\d{17}([0-9]|X)$)/.test(num))){al</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-29 22:07:53</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2396</span></span>  </p> </article><article class="excerpt"> <header> <a title="Javascript" class="label label-important zj-del-target" href="/category/66">Javascript<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/11367" title="学习Javascript闭包（Closure）" target="_blank" onclick="return recordId('tid',66)">学习Javascript闭包（Closure） </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11367" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/10.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/11367';}else{window.open('/article/11367');}" style="cursor: pointer;">闭包（closure）是Javascript语言的一个难点，也是它的特色，很多高级应用都要依靠闭包实现。下面就是我的学习笔记，对于Javascript初学者应该是很有用的。一、变量的作用域要理解闭包，首先必须理解Javascript特殊的变量作用域。变量的作用域无非就是两种：全局变量和局部变量。Javascript语言的特殊之处，就在于函数内部可以直接读取全局变量。varn=999;functionf1(){alert(n);}f1();//999另一方面</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-12 09:29:42</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2380</span></span>  </p> </article><article class="excerpt"> <header> <a title="Javascript" class="label label-important zj-del-target" href="/category/66">Javascript<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/20435" title="用JavaScript获取页面上被选中的文字的技巧" target="_blank" onclick="return recordId('tid',66)">用JavaScript获取页面上被选中的文字的技巧 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/20435" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/15.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/20435';}else{window.open('/article/20435');}" style="cursor: pointer;">这里介绍的一个小技巧是如何用JavaScript获取页面上被选中的文字的方法。最关键的JavaScriptAPI是：event.selection=window.getSelection();这里的selection实际上是个对象，但如果我们使用.toString()或强行转化成字符串，我们将得到被选中的文字。$(document).ready(function(){$(".contenttext").mouseup(function(e){vartxt;</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-29 23:32:32</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2373</span></span>  </p> </article><article class="excerpt"> <header> <a title="Javascript" class="label label-important zj-del-target" href="/category/66">Javascript<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/13388" title="JavaScript中的Boolean，你了解多少？" target="_blank" onclick="return recordId('tid',66)">JavaScript中的Boolean，你了解多少？ </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/13388" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/19.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/13388';}else{window.open('/article/13388');}" style="cursor: pointer;">今天看了一下Flyingis写的《ECMAScript基础》一文。在看到Boolean类这一块内容的时候，随手写了几行代码，问题出现了^+^注：此文讨论的是JavaScript1.5还是先来看一段非常简单的代码//code：1varx=false;vary=true;//code：2varxObject=newBoolean(false);varyObject=newBoolean(true);//code：3varresX=newBoolean(x);v</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-29 22:03:07</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2368</span></span>  </p> 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