


Exemple d'utilisation de r.js pour empaqueter des fichiers javascript modulaires
这篇文章主要给大家介绍了利用r.js打包模块化的javascript文件的相关资料,文中介绍的非常详细,对大家具有一定的参考学习价值,需要的朋友们下面来跟着小编一起看看吧。
前言
r.js(本地下载)是requireJS的优化(Optimizer)工具,可以实现前端文件的压缩与合并,在requireJS异步按需加载的基础上进一步提供前端优化,减小前端文件大小、减少对服务器的文件请求。本文将详细介绍r.js的相关内容,感兴趣的朋友们下面来一起看看吧。
简单打包
【项目结构】
以一个简单的例子来说明r.js的使用。该项目名称为'demo',在js目录下包含s1.js和s2.js两个文件,使用requirejs进行模块化,内容如下
//s1.js define(function (){ return 1; }) //s2.js define(function (){ return 2; })
使用main.js来调用s1.js和s2.js这两个文件
require(['s1','s2'], function(a,b){ console.log(a+b); });
index.html的内容如下
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <script data-main="js/main" src="js/require.js"></script> </head> <body> </body> </html>
运行index.html文件,所依赖资源如下图所示
【打包】
接下来,使用r.js来对javascript文件进行打包,而r.js需要使用build.js文件来进行配置,配置如下
({ baseUrl: "./", name:'main', out:'out.js' })
接下来运行node r.js -o build.js
命令
项目根目录下,生成一个out.js文件,内容如下
define("s1",[],function(){return 1}),define("s2",[],function(){return 2}),require(["s1","s2"],function(n,e){console.log(n+e)}),define("main",function(){});
将index.html的入口文件修改为'out.js',文件依然能正常运行
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <script data-main="js/out" src="js/require.js"></script> </head> <body> </body> </html>
jQuery打包
一般地,我们并不是使用原生javascript进行开发,更多的使用库进行高效开发,以jQuery为例,对上面的代码进行改造
s1模块和s2模块,分别基于jQuery来获取页面p元素的宽、高,内容如下
//s1.js define(['../common/jquery'],function (){ return $('p').height(); }) //s2.js define(['../common/jquery'],function (){ return $('p').width(); })
项目结构如下所示,js文件夹包括common和module两个子文件夹,common文件夹包含公用的require.js和jquery.js,module文件夹包含模块s1.js和s2.js。
页面的根目录下,有index.html、入口文件main.js、以及r.js和build.js
【包含jQuery】
如果打包后的main.js要包含jQuery.js,则代码如下所示
({ appDir: './', //项目根目录 dir: './dist', //输出目录,全部文件打包后要放入的文件夹(如果没有会自动新建的) baseUrl:'./', modules: [ //要优化的模块,相对baseUrl的路径,也是省略后缀“.js” { name:'main' } ], fileExclusionRegExp: /^(r|build)\.js|.*\.scss$/, //过滤,匹配到的文件将不会被输出到输出目录去 optimizeCss: 'standard', removeCombined: true //如果为true,将从输出目录中删除已合并的文件 })
打包后的main.js内容如下所示
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n||(e.selectedIndex=-1),o}}}}),ge.each(["radio","checkbox"],function(){ge.valHooks[this]={set:function(e,t){if(Array.isArray(t))return e.checked=ge.inArray(ge(e).val(),t)>-1}},de.checkOn||(ge.valHooks[this].get=function(e){return null===e.getAttribute("value")?"on":e.value})});var Et=/^(?:focusinfocus|focusoutblur)$/;ge.extend(ge.event,{trigger:function(t,n,r,i){var o,a,s,u,l,c,f,p=[r||ne],d=ce.call(t,"type")?t.type:t,h=ce.call(t,"namespace")?t.namespace.split("."):[];if(a=s=r=r||ne,3!==r.nodeType&&8!==r.nodeType&&!Et.test(d+ge.event.triggered)&&(d.indexOf(".")>-1&&(h=d.split("."),d=h.shift(),h.sort()),l=d.indexOf(":")<0&&"on"+d,t=t[ge.expando]?t:new ge.Event(d,"object"==typeof t&&t),t.isTrigger=i?2:3,t.namespace=h.join("."),t.rnamespace=t.namespace?new RegExp("(^|\\.)"+h.join("\\.(?:.*\\.|)")+"(\\.|$)"):null,t.result=void 0,t.target||(t.target=r),n=null==n?[t]:ge.makeArray(n,[t]),f=ge.event.special[d]||{},i||!f.trigger||f.trigger.apply(r,n)!==!1)){if(!i&&!f.noBubble&&!ge.isWindow(r)){for(u=f.delegateType||d,Et.test(u+d)||(a=a.parentNode);a;a=a.parentNode)p.push(a),s=a;s===(r.ownerDocument||ne)&&p.push(s.defaultView||s.parentWindow||e)}for(o=0;(a=p[o++])&&!t.isPropagationStopped();)t.type=o>1?u:f.bindType||d,c=(Pe.get(a,"events")||{})[t.type]&&Pe.get(a,"handle"),c&&c.apply(a,n),c=l&&a[l],c&&c.apply&&Oe(a)&&(t.result=c.apply(a,n),t.result===!1&&t.preventDefault());return t.type=d,i||t.isDefaultPrevented()||f._default&&f._default.apply(p.pop(),n)!==!1||!Oe(r)||l&&ge.isFunction(r[d])&&!ge.isWindow(r)&&(s=r[l],s&&(r[l]=null),ge.event.triggered=d,r[d](),ge.event.triggered=void 0,s&&(r[l]=s)),t.result}},simulate:function(e,t,n){var r=ge.extend(new ge.Event,n,{type:e,isSimulated:!0});ge.event.trigger(r,null,t)}}),ge.fn.extend({trigger:function(e,t){return this.each(function(){ge.event.trigger(e,t,this)})},triggerHandler:function(e,t){var n=this[0];if(n)return ge.event.trigger(e,t,n,!0)}}),ge.each("blur focus focusin focusout resize scroll click dblclick mousedown mouseup mousemove mouseover mouseout mouseenter mouseleave change select submit keydown keypress keyup contextmenu".split(" "),function(e,t){ge.fn[t]=function(e,n){return arguments.length>0?this.on(t,null,e,n):this.trigger(t)}}),ge.fn.extend({hover:function(e,t){return this.mouseenter(e).mouseleave(t||e)}}),de.focusin="onfocusin"in e,de.focusin||ge.each({focus:"focusin",blur:"focusout"},function(e,t){var n=function(e){ge.event.simulate(t,e.target,ge.event.fix(e))};ge.event.special[t]={setup:function(){var r=this.ownerDocument||this,i=Pe.access(r,t);i||r.addEventListener(e,n,!0),Pe.access(r,t,(i||0)+1)},teardown:function(){var r=this.ownerDocument||this,i=Pe.access(r,t)-1;i?Pe.access(r,t,i):(r.removeEventListener(e,n,!0),Pe.remove(r,t))}}});var 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【不包含jQuery】
如果其他页面也需要用到jQuery,它们打包的时候,也会把jQuery打包。这样,相当于每个页面都打包了一次jQuery,性能很差。更好的做法是,不打包jQuery,其他页面引用jQuery时,就可以使用缓存了。
build.js内容如下所示
({ appDir: './', //项目根目录 dir: './dist', //输出目录,全部文件打包后要放入的文件夹(如果没有会自动新建的) baseUrl:'./', modules: [ //要优化的模块,相对baseUrl的路径,也是省略后缀“.js” { name:'main', exclude: ['js/common/jquery']//不打包jQuery } ], fileExclusionRegExp: /^(r|build)\.js|.*\.scss$/, //过滤,匹配到的文件将不会被输出到输出目录去 optimizeCss: 'standard', removeCombined: true //如果为true,将从输出目录中删除已合并的文件 })
接下来运行node r.js -o build.js
命令
运行后,生成一个'dist'文件夹,该文件夹包含的文件都是处理过后的文件,适合上线
打包后的main.js内容如下所示
define("js/module/s1",["../common/jquery"],function(){return $("p").height()}),define("js/module/s2",["../common/jquery"],function(){return $("p").width()}),require(["js/module/s1","js/module/s2"],function(e,n){console.log(parseInt(e)+parseInt(n))}),define("main",function(){});
总结
Ce qui précède est le contenu détaillé de. pour plus d'informations, suivez d'autres articles connexes sur le site Web de PHP en chinois!

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PyInstaller : Indépendance des applications Python PyInstaller est un outil de packaging Python open source qui regroupe les applications Python et leurs dépendances dans un fichier exécutable indépendant. Ce processus élimine la dépendance à l'égard de l'interpréteur Python tout en permettant aux applications de s'exécuter sur diverses plates-formes, notamment Windows, MacOS et Linux. Processus de packaging Le processus de packaging de PyInstaller est relativement simple et implique les étapes suivantes : L'option pipinstallpyinstallerpyinstaller--onefile--windowedmain.py--onefile crée un seul fichier.

PyInstaller est un outil révolutionnaire qui permet aux applications Python d'aller au-delà de leur forme de script d'origine. En compilant le code Python dans des fichiers exécutables autonomes, PyInstaller ouvre un nouveau domaine de distribution, de déploiement et de maintenance de code. D'un simple script à une application puissante Autrefois, les scripts Python n'existaient que dans un environnement Python spécifique. La distribution d'un tel script nécessite que les utilisateurs installent Python et les bibliothèques nécessaires, ce qui est un processus long et fastidieux. PyInstaller introduit le concept de packaging, combinant le code Python avec toutes les dépendances requises dans un seul fichier exécutable. L’art du packaging de code Le travail de PyInstaller

PyInstaller est une bibliothèque open source qui permet aux développeurs de compiler du code Python en exécutables autonomes indépendants de la plate-forme (.exe ou .app). Pour ce faire, il regroupe le code Python, les dépendances et les fichiers de support pour créer des applications autonomes pouvant s'exécuter sans installer d'interpréteur Python. L'avantage de PyInstaller est qu'il supprime la dépendance à l'environnement Python, permettant aux applications d'être facilement distribuées et déployées vers les utilisateurs finaux. Il fournit également un mode constructeur qui permet aux utilisateurs de personnaliser les paramètres, les icônes, les fichiers de ressources et les variables d'environnement de l'application. Installez PyInstal à l'aide de PyInstaller pour empaqueter le code Python

En tant que plateforme sociale de vidéos courtes de renommée mondiale, Douyin a gagné la faveur d'un grand nombre d'utilisateurs grâce à son algorithme de recommandation personnalisé unique. Cet article approfondira la valeur et les principes de la recommandation vidéo Douyin pour aider les lecteurs à mieux comprendre et à utiliser pleinement cette fonctionnalité. 1. Qu'est-ce que la vidéo recommandée par Douyin ? La vidéo recommandée par Douyin utilise des algorithmes de recommandation intelligents pour filtrer et proposer du contenu vidéo personnalisé aux utilisateurs en fonction de leurs intérêts et de leurs habitudes comportementales. La plateforme Douyin analyse l'historique de visionnage des utilisateurs, le comportement des likes et des commentaires, les enregistrements de partage et d'autres données pour sélectionner et recommander les vidéos qui correspondent le mieux aux goûts des utilisateurs à partir d'une immense vidéothèque. Ce système de recommandation personnalisé améliore non seulement l'expérience utilisateur, mais aide également les utilisateurs à découvrir davantage de contenu vidéo correspondant à leurs préférences, améliorant ainsi la fidélité des utilisateurs et leur taux de rétention. à ceci
