前端常用的库和实用技术之JavaScript 模块化

模块化概念
AMD是requirejs在推广过程中对模块化定义的规范化产出。
异步加载模块，依赖前置，提前执行
Define定义模块define(['require','foo'],function(){return});
Require加载模块（依赖前置）require(['foo','bar'],function(foo,bar){});
CMD是SeaJS在推广过程中对模块化定义的规范化产出。
Define定义exports导出define(function(require,exports,module){});
module上存储了当前模块上的一些对象。
require(./a)直接引入，require.async异步引入
同步加载，依赖就近，延迟执行
类似的还有CommonjsModule/2.0规范
AMD模块化的代码

//index.html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script data-main="js/main.js" src="./js/require.js"></script>
</head>
<body>
    <script>

    </script>
</body>
</html>

//main.js
define(['require','main'],function(require){
    require(['index','test'],function(index,test){
        console.log(index());
        console.log(test());
    })
})

//index.js
define(['require','index'],function(require){
    var index = function(){
        console.log('test index');
    }
    return index;
 })

//test.js
define(['require','index'],function(require){
   var init = function(){
       console.log('test init');
   }
   return init;
})

方法调用的方式

//index.js
define(['require','index'],function(require){
    var index = {};
    var index = {
        init:function(){
            console.log('test init');
        }
    }
    return index;
 })

//main.js
define(['require','main'],function(require){
    require(['index','test'],function(index,test){
        console.log(index.init());
        console.log(test.init());
    })
})

//test.js
define(['require','index'],function(require){
    var index = {};

   var index = {
       init:function(){
           console.log('test init');
       }
   }
   return index;
})

效果为

seajs的应用

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="./js/sea.js"></script>
</head>
<body>
    <script>
        // seajs 的简单配置
seajs.config({
  base: "./js/",
  alias: {
    "jquery": "jquery.js"
  }
})

// 加载入口模块
seajs.use("main")    
    </script>
</body>
</html>

//index.js
define(function(require,exports,module){
    // 透过exports对外提供接口
    // exports.doSomething = function(){
    //     console.log('my ok ');
    // }
    // exports.doSomething2 = function(){
    //     console.log('my ok2 ');
    // }
    var a = {};
    a.doSomething = function(){
        console.log('my ok ');
    }
    a.doSomething2 = function(){
        console.log('my ok2 ');
    }
    // console.log(module);
    module.exports = a;
    
});

//main.js
define(function(require,exports,module){
    require('jquery');
    console.log('..aaa');
    var index =require.async('index',function(index){
        console.log(index);
    });
    
})

本文看自前端常用的库和实用技术之JavaScript 模块化视频

来源：https://www.cnblogs.com/smart-girl/p/11545198.html

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