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step5.js
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step5.js
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/**
* 现代的模块机制 * 模块定义之依赖注入
*/
var MyModules = (function Manager () {
// 所有定义的模块
var modules = {};
function define (name, deps, impl) {
for (var i=0, len=deps.length; i<len; i++) {
// 依赖模块名称,换成了依赖模块
deps[i] = modules[deps[i]]
}
modules[name] = impl.apply(impl, deps)
}
function get (name) {
return modules[name];
}
return {
define,
get
}
})()
MyModules.define('moduleA', [], function () {
return {
log: function (msg) {
console.log(msg)
}
}
})
MyModules.define('moduleB', ['moduleA'], function (moduleA) {
return {
log: function (msg) {
msg = msg.toUpperCase();
moduleA.log(msg)
}
}
})
MyModules.get('moduleA').log('i am module a');
MyModules.get('moduleB').log('i am module b');
// i am module a
// I AM MODULE B