requirejs源码分析: define 方法

define = function (name, deps, callback) {
    var node, context;

    //Allow for anonymous modules
    if (typeof name !== 'string') {
        //Adjust args appropriately
        callback = deps;
        deps = name;
        name = null;
    }

    //This module may not have dependencies
    if (!isArray(deps)) {
        callback = deps;
        deps = null;
    }

    //If no name, and callback is a function, then figure out if it a
    //CommonJS thing with dependencies.
    if (!deps && isFunction(callback)) {
        deps = [];
        //Remove comments from the callback string,
        //look for require calls, and pull them into the dependencies,
        //but only if there are function args.
        if (callback.length) {
            callback
                .toString()
                .replace(commentRegExp, '')
                .replace(cjsRequireRegExp, function (match, dep) {
                    deps.push(dep);
                });

            //May be a CommonJS thing even without require calls, but still
            //could use exports, and module. Avoid doing exports and module
            //work though if it just needs require.
            //REQUIRES the function to expect the CommonJS variables in the
            //order listed below.
            deps = (callback.length === 1 ? ['require'] : ['require', 'exports', 'module']).concat(deps);
        }
    }

    //If in IE 6-8 and hit an anonymous define() call, do the interactive
    //work.
    if (useInteractive) {
        node = currentlyAddingScript || getInteractiveScript();
        if (node) {
            if (!name) {
                name = node.getAttribute('data-requiremodule');
            }
            context = contexts[node.getAttribute('data-requirecontext')];
        }
    }

    //Always save off evaluating the def call until the script onload handler.
    //This allows multiple modules to be in a file without prematurely
    //tracing dependencies, and allows for anonymous module support,
    //where the module name is not known until the script onload event
    //occurs. If no context, use the global queue, and get it processed
    //in the onscript load callback.
    (context ? context.defQueue : globalDefQueue).push([name, deps, callback]);
};

这里的代码比较简单， 主要是把将是将前端的参数 添加到 队列 中。

 

第一个参数name， 可以自定义当前模块的名称， 用于require时可以使用这个名称进行加载。  现在很少使用这个参数，都使用路径的方法加载模块了。