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@sofish
Created July 3, 2012 03:25
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seajs send 404 request
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Loader</title>
<link href="http://typo.sofish.de/typo.css" rel="stylesheet" />
<style type="text/css">
code{padding:0 2px;border:1px solid #eee;background:#f7f7f7;border-radius:3px;}
</style>
<script src="http://test.com:8080/static/??sea/sea.js,modules/jquery-1.7.2.min.js"></script>
</head>
<body class="typo" style="padding:20px 60px;">
<h3>#测试异步加载</h3>
<blockquote id="test">
我现在的位置是:<span id="geo">Loading...</span>
</blockquote>
<h3>#开发原则</h3>
<ul>
<li>默认框架 module 不应该用 seajs 来加载
<p>sea 使用的是传统的 script insertion,默认框架一来永远都是不动的,二来总是需要最先载入的,如果使用 <code>seajs.use()</code> 加载则会产生 insertion 这个过程,反而让页面更慢。</p>
</li>
</ul>
<h3>#注意点</h3>
<ul>
<li>所有 module 都需要经过 <code>seajs.define()</code> 预先定义
<p>可以参考现有这个 <a href="http://test.com:8080/static/modules/jquery-1.7.2.min.js">jQuery-1.7.2.min.js</a>。
</li>
<li>版本可以利用 <code>seajs.config()</code> 中配置 <code>alias</code> 来实现别名。不建议直接删除版本号
</ul>
<script>
seajs.config({
base: 'http://test.com:8080/static/modules'
});
seajs.use(['jquery', 'geolocation'], function($, geo){
geo(function(coords){
$('#geo').html(coords.latitude + ', ' + coords.longitude);
}, function(err){
alert('error occurred: ' + err);
})
})
</script>
</body>
</html>
@sofish
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Author

sofish commented Jul 3, 2012

打包后的 seajs + jquery


/*
 SeaJS - A Module Loader for the Web
 v1.2.0 | seajs.org | MIT Licensed
*/
this.seajs={_seajs:this.seajs};seajs.version="1.2.0";seajs._util={};seajs._config={debug:"",preload:[]};
(function(a){var b=Object.prototype.toString,d=Array.prototype;a.isString=function(a){return"[object String]"===b.call(a)};a.isFunction=function(a){return"[object Function]"===b.call(a)};a.isRegExp=function(a){return"[object RegExp]"===b.call(a)};a.isObject=function(a){return a===Object(a)};a.isArray=Array.isArray||function(a){return"[object Array]"===b.call(a)};a.indexOf=d.indexOf?function(a,b){return a.indexOf(b)}:function(a,b){for(var c=0;c<a.length;c++)if(a[c]===b)return c;return-1};var c=a.forEach=
d.forEach?function(a,b){a.forEach(b)}:function(a,b){for(var c=0;c<a.length;c++)b(a[c],c,a)};a.map=d.map?function(a,b){return a.map(b)}:function(a,b){var d=[];c(a,function(a,c,e){d.push(b(a,c,e))});return d};a.filter=d.filter?function(a,b){return a.filter(b)}:function(a,b){var d=[];c(a,function(a,c,e){b(a,c,e)&&d.push(a)});return d};a.unique=function(a){var b=[],d={};c(a,function(a){d[a]=1});if(Object.keys)b=Object.keys(d);else for(var l in d)d.hasOwnProperty(l)&&b.push(l);return b};a.keys=Object.keys;
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(function(a,b,d){function c(a){a=a.match(r);return(a?a[0]:".")+"/"}function e(a){f.lastIndex=0;f.test(a)&&(a=a.replace(f,"$1/"));if(-1===a.indexOf("."))return a;for(var b=a.split("/"),c=[],d,e=0;e<b.length;e++)if(d=b[e],".."===d){if(0===c.length)throw Error("The path is invalid: "+a);c.pop()}else"."!==d&&c.push(d);return c.join("/")}function m(a){var a=e(a),b=a.charAt(a.length-1);if("/"===b)return a;"#"===b?a=a.slice(0,-1):-1===a.indexOf("?")&&!p.test(a)&&(a+=".js");return a}function h(a){if("#"===
a.charAt(0))return a.substring(1);var c=b.alias;if(c&&q(a)){var d=a.split("/"),e=d[0];c.hasOwnProperty(e)&&(d[0]=c[e],a=d.join("/"))}return a}function l(a){return 0<a.indexOf("://")||0===a.indexOf("//")}function q(a){var b=a.charAt(0);return-1===a.indexOf("://")&&"."!==b&&"/"!==b}var r=/.*(?=\/.*$)/,f=/([^:\/])\/\/+/g,p=/\.(?:css|js)$/,g=/^(.*?\w)(?:\/|$)/,n={},d=d.location,i=d.protocol+"//"+d.host+function(a){"/"!==a.charAt(0)&&(a="/"+a);return a}(d.pathname);0<i.indexOf("\\")&&(i=i.replace(/\\/g,
"/"));a.dirname=c;a.realpath=e;a.normalize=m;a.parseAlias=h;a.parseMap=function(c,d){d||(d=b.map||[]);if(!d.length)return c;for(var e=c,o=0;o<d.length;o++){var g=d[o];if(a.isArray(g)&&2===g.length){var i=g[0];if(a.isString(i)&&-1<e.indexOf(i)||a.isRegExp(i)&&i.test(e))e=e.replace(i,g[1])}else a.isFunction(g)&&(e=g(e))}e!==c&&(n[e]=c);return e};a.unParseMap=function(a){return n[a]||a};a.id2Uri=function(a,d){a=h(a);d||(d=i);var e;l(a)?e=a:0===a.indexOf("./")||0===a.indexOf("../")?(0===a.indexOf("./")&&
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(function(a,b){function d(a,c){a.onload=a.onerror=a.onreadystatechange=function(){n.test(a.readyState)&&(a.onload=a.onerror=a.onreadystatechange=null,a.parentNode&&!b.debug&&l.removeChild(a),a=void 0,c())}}function c(b,c){f||p&&!("onload"in b)?(a.log("Start poll to fetch css"),setTimeout(function(){e(b,c)},1)):b.onload=b.onerror=function(){b.onload=b.onerror=null;b=void 0;c()}}function e(a,b){var c;if(f)a.sheet&&(c=!0);else if(a.sheet)try{a.sheet.cssRules&&(c=!0)}catch(d){if("SecurityError"===d.name||
"NS_ERROR_DOM_SECURITY_ERR"===d.name)c=!0}setTimeout(function(){c?b():e(a,b)},1)}function m(){}var h=document,l=h.head||h.getElementsByTagName("head")[0]||h.documentElement,q=l.getElementsByTagName("base")[0],r=navigator.userAgent,f=0<r.indexOf("Safari")&&-1===r.indexOf("Chrome"),p=0<r.indexOf("Firefox"),g=/\.css(?:\?|$)/i,n=/loaded|complete|undefined/,i,j;a.fetch=function(b,e,o){var j=g.test(b),f=document.createElement(j?"link":"script");o&&(o=a.isFunction(o)?o(b):o)&&(f.charset=o);e=e||m;"SCRIPT"===
f.nodeName?d(f,e):c(f,e);j?(f.rel="stylesheet",f.href=b):(f.async="async",f.src=b);i=f;q?l.insertBefore(f,q):l.appendChild(f);i=null};a.getCurrentScript=function(){if(i)return i;if(j&&"interactive"===j.readyState)return j;for(var a=l.getElementsByTagName("script"),b=0;b<a.length;b++){var c=a[b];if("interactive"===c.readyState)return j=c}};a.getScriptAbsoluteSrc=function(a){return a.hasAttribute?a.src:a.getAttribute("src",4)};a.importStyle=function(a,b){if(!b||!h.getElementById(b)){var c=h.createElement("style");
b&&(c.id=b);l.appendChild(c);c.styleSheet?c.styleSheet.cssText=a:c.appendChild(h.createTextNode(a))}}})(seajs._util,seajs._config,this);(function(a){var b=/(?:^|[^.$])\brequire\s*\(\s*(["'])([^"'\s\)]+)\1\s*\)/g;a.parseDependencies=function(d){var c=[],e,d=d.replace(/^\s*\/\*[\s\S]*?\*\/\s*$/mg,"").replace(/^\s*\/\/.*$/mg,"");for(b.lastIndex=0;e=b.exec(d);)e[2]&&c.push(e[2]);return a.unique(c)}})(seajs._util);
(function(a,b,d){function c(a,b){this.uri=a;this.status=b||0}function e(a,d){return b.isString(a)?c._resolve(a,d):b.map(a,function(a){return e(a,d)})}function m(a,s){var k=b.parseMap(a);z[k]?s():t[k]?o[k].push(s):(t[k]=!0,o[k]=[s],c._fetch(k,function(){z[k]=!0;u&&(h(a,u),u=null);var c=w[0];c&&g[a].status===j.FETCHING&&(g[a]=c);w=[];t[k]&&delete t[k];o[k]&&(b.forEach(o[k],function(a){a()}),delete o[k])},d.charset))}function h(a,d){var k=g[a]||(g[a]=new c(a));k.status<j.SAVED&&(k.id=d.id||a,k.dependencies=
e(b.filter(d.dependencies||[],function(a){return!!a}),a),k.factory=d.factory,k.status=j.SAVED);return k}function l(a,b){var c=a(b.require,b.exports,b);void 0!==c&&(b.exports=c)}function q(a){var c=a.uri,d=n[c];d&&(b.forEach(d,function(b){l(b,a)}),delete n[c])}function r(a){var c=a.uri;return b.filter(a.dependencies,function(a){v=[c];if(a=f(g[a],c))v.push(c),p(v);return!a})}function f(a,c){if(!a||a.status!==j.SAVED)return!1;v.push(a.uri);var d=a.dependencies;if(d.length){if(-1<b.indexOf(d,c))return!0;
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g[a].status<j.LOADED)});if(0===x.length)d();else for(var f=x.length,i=f,l=0;l<f;l++)(function(a){function b(){d=g[a];if(d.status>=j.SAVED){var s=r(d);s.length?c.prototype._load(s,function(){e(d)}):e(d)}else e()}var d=g[a]||(g[a]=new c(a,j.FETCHING));d.status===j.SAVED?b():m(a,b)})(x[l])};c.prototype._compile=function(){function a(b){b=e(b,c.uri);b=g[b];if(!b||b.status<j.LOADED)return null;for(var d=!1,k=[b.uri],f=b;f=f.parent;)if(k.unshift(f.uri),f===b){d=!0;break}d&&p(k,"warn");if(d)return b.exports;
b.parent=c;return b._compile()}var c=this;if(c.exports)return c.exports;a.async=function(a,b){c._use(a,b)};a.resolve=function(a){return e(a,c.uri)};a.cache=g;c.require=a;c.exports={};var d=c.factory;b.isFunction(d)?(i.push(c),l(d,c),i.pop()):void 0!==d&&(c.exports=d);c.status=j.COMPILED;q(c);return c.exports};c._define=function(a,c,d){var f=arguments.length;1===f?(d=a,a=void 0):2===f&&(d=c,c=void 0,b.isArray(a)&&(c=a,a=void 0));!b.isArray(c)&&b.isFunction(d)&&(c=b.parseDependencies(d.toString()));
if(a)var g=e(a);else document.attachEvent&&((f=b.getCurrentScript())&&(g=b.unParseMap(b.getScriptAbsoluteSrc(f))),g||b.log("Failed to derive URI from interactive script for:",d.toString(),"warn"));f={id:a,dependencies:c,factory:d};g?w.push(h(g,f)):u=f};c._getCompilingModule=function(){return i[i.length-1]};c._find=function(a){var c=[];b.forEach(b.keys(g),function(d){if(b.isString(a)&&-1<d.indexOf(a)||b.isRegExp(a)&&a.test(d))d=g[d],d.exports&&c.push(d.exports)});var d=c.length;1===d?c=c[0]:0===d&&
(c=null);return c};c._modify=function(b,c){var d=e(b),f=g[d];f&&f.status===j.COMPILED?l(c,f):(n[d]||(n[d]=[]),n[d].push(c));return a};c.STATUS=j;c._resolve=b.id2Uri;c._fetch=b.fetch;c.cache=g;var t={},z={},o={},u=null,w=[],v=[],y=new c(b.pageUri,j.COMPILED);a.use=function(b,c){var e=d.preload;e.length?y._use(e,function(){d.preload=[];y._use(b,c)}):y._use(b,c);return a};a.define=c._define;a.cache=c.cache;a.find=c._find;a.modify=c._modify;a.pluginSDK={Module:c,util:b,config:d}})(seajs,seajs._util,seajs._config);
(function(a,b,d){var c="seajs-ts="+b.now(),e=document.getElementById("seajsnode");e||(e=document.getElementsByTagName("script"),e=e[e.length-1]);var m=b.getScriptAbsoluteSrc(e)||b.pageUri,m=b.dirname(m);b.loaderDir=m;var h=m.match(/^(.+\/)seajs\/[\d\.]+\/$/);h&&(m=h[1]);d.base=m;if(e=e.getAttribute("data-main"))d.main=e;d.charset="utf-8";a.config=function(e){for(var h in e)if(e.hasOwnProperty(h)){var m=d[h],f=e[h];if(m&&h==="alias")for(var p in f){if(f.hasOwnProperty(p)){var g=m[p],n=f[p];/^\d+\.\d+\.\d+$/.test(n)&&
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d.debug&&(a.debug=!!d.debug)})(seajs,seajs._util,seajs._config);(function(a,b,d){a.log=b.log;a.importStyle=b.importStyle;a.config({alias:{seajs:b.loaderDir}});if(-1<d.location.search.indexOf("seajs-debug")||-1<document.cookie.indexOf("seajs=1"))a.config({debug:2}).use("seajs/plugin-debug"),a._use=a.use,a._useArgs=[],a.use=function(){a._useArgs.push(arguments);return a}})(seajs,seajs._util,this);
(function(a,b,d){var c=a._seajs;if(c&&!c.args)d.seajs=a._seajs;else{d.define=a.define;b.main&&a.use(b.main);if(b=(c||0).args){d={"0":"config",1:"use",2:"define"};for(c=0;c<b.length;c+=2)a[d[b[c]]].apply(a,b[c+1])}delete a.define;delete a._util;delete a._config;delete a._seajs}})(seajs,seajs._config,this);
define('#jquery', [], function(require) {

  /*! jQuery v1.7.2 jquery.com | jquery.org/license */
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@sofish
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sofish commented Jul 3, 2012

seajs object stack

seajs object

@sofish
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sofish commented Jul 3, 2012

seajs.use('jquery', callback) 可以,但依然发出 404 请求

404 jquery

@lifesinger
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@sofish

有几点想探讨下:

  1. jquery 等框架文件的同步引入。我推荐还是异步引入,目前支付宝是这样用的:

页头:

<script src="https://a.alipayobjects.com/static/arale/seajs/1.2.0/sea.js,plugin-combo.js" id="seajsnode"></script>
<script>
// 全部配置,除了 jquery 还可以有其他
seajs.config({
  alias: {
    '$': 'jquery/1.7.2/jquery'
  }
})

// 异步独立加载 jquery
seajs.use('jquery')
</script>

页面中:

seajs.use(['$', 'xx'], function($, xx) {
   // biz code
})

异步加载 jquery 等类库文件有一个好处:用户第一次打开页面时,jquery.js 的加载不是同步阻塞的,能比较明显的提高无缓存用户的页面打开速度。

无缓存用户,根据在淘宝时的统计,有 20-30% 多,挺大的占比,还是得考虑。这批用户往往是新用户,页面速度是留住新用户的因素之一,不可小觑。

至于异步插入 script 导致的页面 reflow,个人觉得可以忽略。而且,seajs.use('jquery') 是放在页面头部的,插入时页面还没开始渲染,不会增加 reflow

一楼提到的重复发请求的问题,是 combo 导致的。目前已修复,可以到 https://github.com/seajs/seajs/tree/master/dist 下载覆盖下就好。

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