JavaScript 异步加载库：LoadJS

jopen 9年前

LoadJS 是一个微型的异步加载库，支持流行的浏览器，体积非常小，只有 590 字节。

LoadJS is a tiny async loading library for modern browsers (IE9+). It has a simple yet powerful dependency management system that lets you fetch files in parallel and execute code after the dependencies have been met. The recommended way to use LoadJS is to include the minified source code in your <html> and then use theloadjsglobal to manage JavaScript dependencies after pageload.

LoadJS is based on the excellent $script library by Dustin Diaz. We kept the behavior of the library the same but we re-wrote the code from scratch to add support for success/failure callbacks and to optimize the library for modern browsers. LoadJS is 590 bytes (minified + gzipped).


示例代码： 

// define a dependency bundle  loadjs(['foo.js', 'bar.js'], 'foobar');     // execute code elsewhere when the bundle has loaded  loadjs.ready('foobar', function() {    // foo.js & bar.js loaded  });

支持的浏览器：

  • IE9+

  • Opera 12+

  • Safari 5+

  • Chrome

  • Firefox

  • iOS 6+

  • Android 4.4+ 

// load a single file  loadjs('foo.js', function() {    // foo.js loaded  });      // load multiple files  loadjs(['foo.js', 'bar.js'], function() {    // foo.js & bar.js loaded  });      // add a bundle id  loadjs(['foo.js', 'bar.js'], 'foobar', function() {    // foo.js & bar.js loaded  });      // add a failure callback  loadjs(['foo.js', 'bar.js'],         'foobar',         function() { /* foo.js & bar.js loaded */ },         function(pathsNotFound) { /* at least one path didn't load */ });      // execute a callback after bundle finishes loading  loadjs(['foo.js', 'bar.js'], 'foobar');    loadjs.ready('foobar', function() {    // foo.js & bar.js loaded  });      // .ready() can be chained together  loadjs('foo.js', 'foo');  loadjs('bar.js', 'bar');    loadjs    .ready('foo', function() {      // foo.js loaded    })    .ready('bar', function() {      // bar.js loaded    });      // compose more complex dependency lists  loadjs('foo.js', 'foo');  loadjs('bar.js', 'bar');  loadjs(['thunkor.js', 'thunky.js'], 'thunk');      // wait for multiple depdendencies  loadjs.ready(['foo', 'bar', 'thunk'],               function() {                 // foo.js & bar.js & thunkor.js & thunky.js loaded               },               function(depsNotFound) {                 if (depsNotFound.indexOf('foo') > -1) {};  // foo failed                 if (depsNotFound.indexOf('bar') > -1) {};  // bar failed                 if (depsNotFound.indexOf('thunk') > -1) {};  // thunk failed               });      // use .done() for more control  loadjs.ready('my-awesome-plugin', function() {    myAwesomePlugin();  });    loadjs.ready('jquery', function() {    // plugin requires jquery    window.myAwesomePlugin = function() {      if (!window.jQuery) throw "jQuery is missing!";    };      // plugin is done loading    loadjs.done('my-awesome-plugin');  });

Directory structure 

loadjs/  ├── dist  |   ├── loadjs.js  |   └── loadjs.min.js  ├── examples/  ├── gulpfile.js  ├── main.js  ├── package.json  ├── LICENSE.md  ├── README.md  ├── src  |   └── loadjs.js  ├── test/

Development Quickstart

  1. Install dependencies

  2. Clone repository 

    $ git clone git@github.com:muicss/loadjs.git  $ cd loadjs

  3. Install node dependencies using npm 

    $ npm install

  4. Build examples 

    $ ./node_modules/.bin/gulp build-examples

    To view the examples you can use any static file server. To use thenodejshttp-server module: 

    $ npm install http-server  $ ./node_modules/.bin/http-server -p 3000

    Then visit http://localhost:3000/examples

Run tests

To run the browser tests first build theloadjslibrary: 

$ ./node_modules/.bin/gulp build-test

Then visit http://localhost:3000/test

项目主页：http://www.open-open.com/lib/view/home/1437786280334