Require a module, without going to Node.js's require cache

try_require.js

var _invalidateRequireCacheForFile = function(mmm){
	try{
		var p=require.resolve(mmm);
		delete require.cache[p];
	}catch(ex){};
};

var try_require=function(mmm,nocache){
	if(nocache) _invalidateRequireCacheForFile(mmm);
	try{
		return require(mmm);
	}catch(ex){
		//TODO 判断如果是网络的就抓回到 tmp再require
		//如果是本地的，尝试到 ./src/  ../上面再找找
		return null;
	}
};

module.exports=try_require;