使用r.js来打包模块化的javascript文件

前面的话

  r.js(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

 

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div元素的宽、高,内容如下

//s1.js
define(['../common/jquery'],function (){
    return $('div').height();
})
//s2.js
define(['../common/jquery'],function (){
    return $('div').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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wt=/^(?:input|select|textarea|button)$/i,Tt=/^(?:a|area)$/i;ge.fn.extend({prop:function(e,t){return Fe(this,ge.prop,e,t,arguments.length>1)},removeProp:function(e){return this.each(function(){delete this[ge.propFix[e]||e]})}}),ge.extend({prop:function(e,t,n){var r,i,o=e.nodeType;if(3!==o&&8!==o&&2!==o)return 1===o&&ge.isXMLDoc(e)||(t=ge.propFix[t]||t,i=ge.propHooks[t]),void 0!==n?i&&"set"in i&&void 0!==(r=i.set(e,n,t))?r:e[t]=n:i&&"get"in i&&null!==(r=i.get(e,t))?r:e[t]},propHooks:{tabIndex:{get:function(e){var t=ge.find.attr(e,"tabindex");return t?parseInt(t,10):wt.test(e.nodeName)||Tt.test(e.nodeName)&&e.href?0:-1}}},propFix:{for:"htmlFor",class:"className"}}),de.optSelected||(ge.propHooks.selected={get:function(e){var t=e.parentNode;return t&&t.parentNode&&t.parentNode.selectedIndex,null},set:function(e){var 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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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View Code

【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 $("div").height()}),define("js/module/s2",["../common/jquery"],function(){return $("div").width()}),require(["js/module/s1","js/module/s2"],function(e,n){console.log(parseInt(e)+parseInt(n))}),define("main",function(){});

 

posted @ 2017-06-09 23:51 小火柴的蓝色理想 阅读(...) 评论(...) 编辑 收藏