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l.js

l.js is another simple/tiny javascript/css loader

此腳本不應該直接安裝,它是一個供其他腳本使用的函式庫。欲使用本函式庫,請在腳本 metadata 寫上: // @require https://greasyfork.org/scripts/23419-l-js/code/ljs.js?version=634829

作者
jaeger
評價
0 0 0
版本
0.0.1.20181007120505
建立日期
更新日期
授權條款
未知
腳本執行於
所有網站

腳本說明

Github:https://github.com/jae-jae/l.js

l.js is another simple/tiny javascript/css loader

Modify by Jaeger JaegerCode@gmail.com

Modify log

  • 2016-09-19:Add exec and execJs function; In order to load the js file and execute js script, but don't insert the js file link into the document header.

features

  • parallel script / css loading
  • callback after script loading (css support callback too but are executed imediately)
  • tiny only 2.1ko uglifyed, less than 1ko gziped (at least for latest revision)
  • may load in order to preserve dependencies
  • support aliases for simpler calling
  • on demand loading
  • only one script tag required
  • clear syntax
  • successive load of same file will load it once but execute all callbacks associated
  • can dumbly check already inserted tags at load time
  • may use a fallback url on error (only for js files and with error events compatible browsers)

examples

loading ljs and another libs with one single tag

<script src="l.js">
    ljs.load('myLib.js',function(){ /* your callback here */});
    ljs.exec('myLib.js',function(){ /* your callback here */});
</script>

loading some scripts in parallel others in order

<script src="l.js">
    ljs
        .load('myLib.js')
        .load('myRequiredLib.js','myDependentLib.js',function(){ /* your callback here */})
    ;

    ljs
            .load('myLib.js')
            .exec('myRequiredLib.js','myDependentLib.js',function(){ /* your callback here */})
        ;
</script>

second load will be executed in parallel of first load but myDependentLib.js won't load before myRequireLib.js is loaded

<script src="l.js">
    ljs.load(['myLib.js','myRequiredLib.js'],'myDependentLib.js',function(){ /* your callback here */});
</script>

this will load myLib.js and myRequiredLib.js in parrallel and wait for them before loading myDependentLib.js

using some aliases for simpler loading

<script src="l.js?checkLoaded"> // <- adding checkLoaded to the url will dumbly check already inserted script/link tags
    ljs
        .addAliases({
            jQuery:'http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js#jqueryId' // <- script tag will have attribute id=jqueryId
            ui:[
                'jQuery'
                ,'https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.18/jquery-ui.min.js'
                ,'myUITheme.css'
            ]
        })
        .load('ui',function(){
            /* work with both jquery and jquery-ui here */
        })
    ;
</script>

define a fallback url

l.js also support a fallback url for javascript files in case you want to try to get the resource from another location on loading failure You can define this fallback url parameter like you define ids. The difference is you will prefix with #= instead of # alone

<script src="l.js">
    ljs.load('http://domain.com/myLib.js#=/myfallback.js#myid',function(){
        /*
            generated script tag will have myid as id and will try to load /myfallback.js if it fail to load http://domain.com/myLib.js
        */
    });
</script>

this piece of code is dual licensed under MIT / GPL Hope this help, code review, suggestions, bug reports are welcome and appreciated.