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limu
July 31, 2012
Technology
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KsLite-for-3rd-Part-Content-Develop
limu
July 31, 2012
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Transcript
使用KsLite支持第三方 内容开发 李牧 2010-12-16
inf.js-2.0 <script> alimama_pid="mm_1_2_3";alimama_type=2; alimama_width=270;alimama_height=390; </script> <script src="http://a.alimama.cn/inf.js"></script>
inf.js-3.0 <script> alimama_pid="mm_1_2_3";alimama_type=2; alimama_width=270;alimama_height=390; </script> <script src="http://anydomain/inf.js"></script>
inf.js-3.0 <script src="http://anydomain/inf.js"></script> <script> alimama_pid="mm_1_2_3";alimama_type=2; alimama_width=270;alimama_height=390; window.alimama_show && alimama_show(); </script>
inf.js-3.0 <!-- http://anydomain/any.js include the content of inf.js --> <script
src="http://anydomain/any.js"></script> <script> alimama_pid="mm_1_2_3";alimama_type=2; alimama_width=270;alimama_height=390; window.alimama_show && alimama_show(); </script>
inf.js-3.0 <script> //content of inf.js </script> <script> alimama_pid="mm_1_2_3";alimama_type=2; alimama_width=270;alimama_height=390; window.alimama_show
&& alimama_show(); </script>
http://a.com/a.html: alimama_show() <script src="inf.js"></script> <script> alimama_show(); </script> <iframe src="" style="display:none
!important" id="anchor-pid"> <!-- ad content--> </iframe> <head> <script src="main.js"></script> </head> <div> <!-- ad content--> </div> destory iframe onunload onbeforeunload
Inf.js – 3.0 需求&功能 • 需求 • 必须稳定 • 足够小
• 可扩展 -- 结构化 • 功能 • "alimama_" 变量收集 • 锚点/容器 iframe 输出 • 动态内容无阻引入 • kissyLite
KsLite kissylite,是kissy的一个支持有限方 法的子集 目标是用1.5k代码支持包管理和模 块化管理 预览地址
KsLite -- 足够小 统一风格的OOP,异步的带依赖关系模块化,简单的模板. • S.mix • S.extend • S.clone
• S.add • S.use • S.getScript • S.substitute
KsLite -- 基于包的扩展 包内无限可扩展 => 模块名由包名,路径,文件名.三部分构成. {packagename} - [ {path_0}
- ... - {path_n} - ] {filename} S.Config.lt_pkgs={ inf:"http://a.alimama.cn/kslite/", test:"http://demo.taobao.com/tbad/kslite/" } 模块"inf-a“: http://a.alimama.cn/kslite/inf/a.js 模块"test-t-1“: http://demo.taobao.com/tbad/kslite/test/t/1.js
KsLite -- 基于包的扩展 可扩展无限包 => package root router 在一个地址记录所有可用的包以及对应的class root.
S.Config.lt_pkgrouter = http://a.alimama.cn/kslite/router.js S.mix(S.Config.lt_pkgs,{ pkg1:"http://a.alimama.cn/pkg1/", pkg2:"http://demo.taobao.com/tbad/pkg2/" }); 当自带S.Config.lt_pkgs没有相关配置时询问pkgrouter.
KsLite -- 命名约定 S.add("pkg1-path1-mod1",function(S,P){ S["pkg1"] = S["pkg1"] || {}; P
= S["pkg1"]; }); S.use("pkg1-path1-mod1",function(S,P){}); 保证包内对象都在名称空间P,即S.P内. 相当于另一个途径实现S.app(),嵌入至S的app. 为了被Kissy兼容,P只能作为开发约定,手动写在每个包中.
KsLite -- 轻量的add S.add = function(name, fn, config){ var mods
= S.Env.mods, mod; if (mods[name] && mods[name].status > INIT)return; mod = {name: name,fn: fn || null,status: LOADED}; mods[name] = S.mix(mod,config); } 不提前attach,保证模块在使用之前没有多余的代码执行消耗. 可选优化:domready之前按需执行,domready之后选择性预热.
KsLite -- 简单的use S.use = function(modNames, callback){ var mods =
S.Env.mods; modNames = modNames.split(','); S.attachMods(modNames, function(){ if (callback) callback(S); }); } 将attachMods单独提出来.不止供use中使用.
KsLite – 明确的attachMod 如果模块LOADED,直接attach. 如果模块没有LOADED,则异步载入模块.然后attach. 模块load之后,attach时如果发现requires. attachMods(requires,callbcak).之后attach.
asyncer -- 异步执行单元 /* * @interface asyncer 可能需要等待再回调的function. * @param
{ * } args * @param { Function | Object } callback info * @param {number} timeout(ms) * @return {Object} */ function ayncer(args , callback,timeout){ }
parallel asyncers L asyncerA(a,function(resA){ window.resA = resA; if(window.resB)c(); }); asyncerB(b,function(resB){
window.resB = resB; if(window.resA)c(); }) function c(){ //your code run after resA & resB both returend. }
serial asyncers L asyncerA(a,function(resA){ asyncerB(b,function(resB){ asyncerC(c,function(resC){ //your code. }) });
});
S.multiAsync J S.multiAsync(asyncers,callback,timeout,isSerial); 实例: S.attachMods = function(modNames,callback){ var i, asyncers
= {}; for (i = 0; i < modNames.length; i++) { asyncers[modNames[i]] = { f: S.attachMod, a: modNames[i] }; } S.multiAsync(asyncers, callback); }
串行模块加载优化 场景: mod-a requires mod-b mod-b requires mod-c 开发时: S.use(“mod-a”,function(){});
//串行的载入mod-a,mod-b,mod-c.效率不高 代码开发完成,发布上线之前,手动预编译优化(就是Google Closure做事的时候): S.log("should use('mod-a,mod-b,mod-c') here for parallel download !"); S.log("should combine 'mod/b.js','mod/c.js' to 'mod/a.js' for reduce requests !");
避免循环引用 模块和包都是无限可扩展的,一旦出现循环引用,影响客户页面稳定性 场景: mod-a requires mod-b mod-b requires mod-c mod-c
requires mod-a 运行时: S.use("mod-a",function(){}); throw new Error("Fatal Error,Loop Reqs!");
简单粗暴的算法 在env中有一个对象记录 x模块依赖哪些模块 x模块支持哪些模块 当出现x依赖x的时候 thorw error.
避免循环引用实例 Load mod-a => requires b 依赖关系: a => b
支持关系 b <= a
避免循环引用实例 Load mod-b => requires c 依赖关系: a => b
, c b => c 支持关系: b <= a c <= b , a
避免循环引用实例 Load mod-c => requires a 依赖关系: a => b
, c , a b => c , a c => a a依赖a throw Error.
简单粗暴的算法 多次遍历 + 数据冗余. 广告类小应用勉强可以. 求更好的算法J
被Kissy兼容 S.app("KSLITE"); 仍然是发布前预编译时,生成面向KISSY.add的模块注册代码.
End