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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">3003</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('',)">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/18.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">3003</span></span>  </p> </article><article class="excerpt"> <header> <a title="PHP" class="label label-important zj-del-target" href="/category/64">PHP<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/11562" title="Zend Framework中文化团队新站点开通--PHPEye.c" target="_blank" onclick="return recordId('',)">Zend Framework中文化团队新站点开通--PHPEye.c </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11562" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/18.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/11562';}else{window.open('/article/11562');}" style="cursor: pointer;"><iframealign="top"marginwidth="0"marginheight="0"src="http://www.zealware.com/46860.html"frameborder="0"width="468"scrolling="no"height="60"></iframe>开通了一个新站点http://www.phpeye.com。现在正考虑用什么方式来组织，wiki还是CMS？最好要有一定互动性。前期主要用来推广ZendFram</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 09:29:49</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3003</span></span>  </p> </article><article class="excerpt"> <header> <a title="数据库相关" class="label label-important zj-del-target" href="/category/32">数据库相关<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/8284" title="sqlldr日期格式" target="_blank" onclick="return recordId('',)">sqlldr日期格式 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/8284" 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/8284';}else{window.open('/article/8284');}" style="cursor: pointer;">日期格式终止等OPTIONS(direct=true,ERRORS=50,skip=0,rows=10000,readsize=20971520,bindsize=20971520)Loaddatainfile'input.txt'"str'****@@@@'"truncateintotableaction_cfieldsterminatedby'@#$'optionallyenclosedby'%%%%%'(ACTION_ID,TimeDATE'YYYY</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 01:55:00</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3003</span></span>  </p> </article><article class="excerpt"> <header> <a title="redis" class="label label-important zj-del-target" href="/category/63">redis<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/20763" title="Mongodb Redis HBase" target="_blank" onclick="return recordId('',)">Mongodb Redis HBase </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/20763" 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/20763';}else{window.open('/article/20763');}" style="cursor: pointer;">from:soclassictobenotedhere.Inthislight,hereisacomparisonofCassandra,Mongodb,CouchDB,Redis,Riak,Membase,Neo4jandHBase:CouchDB(V1.1.1)Writtenin:ErlangMainpoint:DBconsistency,easeofuseLicense:ApacheProtocol:HTTP/RESTBi-directional(!</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 23:36:32</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3002</span></span>  </p> </article><article class="excerpt"> <header> <a title="IOS" class="label label-important zj-del-target" href="/category/58">IOS<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/15531" title="iOS App的图标，启动画面及其它" target="_blank" onclick="return recordId('',)">iOS App的图标，启动画面及其它 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/15531" 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/15531';}else{window.open('/article/15531');}" style="cursor: pointer;">注意：最新的图标尺寸和文件名规格以Apple的文档为准：TechnicalQ&AQA1686:AppIconsoniPadandiPhone。其中要注意，iTunesArtWork这项不用写入Info.plist的Iconfiles。这点Apple的文档加粗说明了。图标的圆角和光晕效果圆角效果。图标的圆角效果是系统自动加上的，我们不能控制。这也是为什么我们看到的每个图标，其圆角效果是完全相同的。光晕效果。光晕效果也是系统加上的，和“圆角”不同的是，光晕效果</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 22:29:50</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3002</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('',)">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/2.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">3002</span></span>  </p> </article><article class="excerpt"> <header> <a title="Python" class="label label-important zj-del-target" href="/category/44">Python<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/31144" title="python将图片旋转，颠倒，修改尺寸" target="_blank" onclick="return recordId('',)">python将图片旋转，颠倒，修改尺寸 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/31144" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/18.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/31144';}else{window.open('/article/31144');}" style="cursor: pointer;">直接上代码，根据需求注释选择相应修改fromPILimportImageimportosimportos.pathrootdir=r'G:\jianfeng\project\rubblish_det\faster_rcnn\rubbish_voc_xml\rubbish_pic_forTest\4396'#指明被遍历的文件夹forparent,dirnames,filenamesinos.walk(rootdir):forfilenameinfilenam</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">2019-09-27 17:57:38</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3001</span></span>  </p> </article><article class="excerpt"> <header> <a title="CSS" class="label label-important zj-del-target" href="/category/68">CSS<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/11287" title="CSS3 support for Internet Explorer 6, 7, and" target="_blank" onclick="return recordId('',)">CSS3 support for Internet Explorer 6, 7, and </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11287" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/7.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/11287';}else{window.open('/article/11287');}" style="cursor: pointer;"><divclass="box1"><h3>whatisit?</h3>ie-css3isascripttoprovideinternetexplorersupportforsomenewstylesavailableintheupcomingcss3standard.<h3>howitworks</h3>ifyou'reviewingthispageininternetexplorer,someoftheelementshavebeenrebuiltbyt</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 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