JS模块化库seajs体验

seajs

Extremely simple experience of modular development

Why use Sea.js ？

Sea.js's pursuit of a simple, natural coding and organization，has the following key aspects:

The definition of a module specification is simple and friendly：Sea.js follow the CMD specification，as the Node.js module style.
Natural and intuitive code organization：Automatically load dependence, configuration is simple and clear，so that we can more enjoy coding.

Sea.js provides common plug-ins，they are very helpful for the development of debugging and performance optimization，and has a rich extensible interface.

模块的声明非常简单和友好。

自然和直觉性的代码组织方式。自动依赖下载和配置简单明了。

兼容性：

Compatibility

Sea.js has perfect test cases, compatible with all major browsers:
Chrome 3+         ✔
Firefox 2+        ✔
Safari 3.2+       ✔
Opera 10+         ✔
IE 5.5+           ✔
Sea.js can be run in Mobile terminal，including Hybrid Mode App. In theory, Sea.js can be run in any browser.

CMD

http://wiki.commonjs.org/wiki/Modules/1.1.1

CMD规范模块定义格式

//Inside b.js:
define(function(require, exports, module) {
    //If "a" has used exports, then we have a real
    //object reference here. However, we cannot use
    //any of "a"'s properties until after "b" returns a value.
    var a = require("a");

    exports.foo = function () {
        return a.bar();
    };
});

AMD规范：

http://www.requirejs.org/docs/api.html#funcmodule

//Inside b.js:
define(["require", "a"],
    function(require, a) {
        //"a" in this case will be null if "a" also asked for "b",
        //a circular dependency.
        return function(title) {
            return require("a").doSomething();
        }
    }
);

实验

https://github.com/fanqingsong/code-snippet/tree/master/web/seajs_demo

one.js

//Inside one.js:
define(function(require, exports, module) {
      var two = require('./two.js');

      exports.sayHello = function() {
        console.log('one module called');
      };

      exports.callTwo = function() {
        two.sayHello();
      };
    }
);

two.js

//Inside two.js:
define(function(require, exports, module) {
      exports.sayHello = function() {
        console.log('two module called');
      };
    }
);

demo.html

<html>
<head>
        
        <script src="./sea.js"></script>
        <style>

        </style>
        <script>
        seajs.use('one', function(one) {
          one.sayHello();
          one.callTwo();
        });
        </script>
</head>
<body>
        <h1>hello world!</h1>
</body>
</html>

相比requirejs，更加直接，使用更加简单。