加载器中的预编

  if (_type == "js") {//js预编译
                    var _script = "_define(function(exports,module){
";
                    _script += "var $parent = "" + _basePath + "";
";
                    _script += data.replace(/require(/g, "_require($parent,");
                    _script += ";
});" + "//@ sourceURL=" + _absUrl(path);
                    _moudle = window["eval"](_script);
}

上面这段程序会把下面的代码

exports.txt = "hello word";
var rep=require("./js/moule");
module.exports={
    "name":"张三"
}

预编译为

_define(function(exports,module){
var $parent = "";
exports.txt = "hello word";
var rep=_require($parent,"./js/moule");
module.exports={
    "name":"张三"
};
});//@ sourceURL=http://localhost:63342/jiaocheng/moudle.js

1.加上了_define(function(exports,module){ 

2.var rep=require("./js/moule"); 变为了var rep=_require($parent,"./js/moule");

3.加上了var $parent = "";  $parent 是 当前js 的路径，因为 当前js在根目录 所以$parent为空