docs: function readMainFiles(path, files) {
  		fs.readdirSync(path).forEach(function (filename) {
  			var file = path+'/'+filename;
  			if (filename.slice(-3)==='.js') {
  				files.push(file.slice(prj_path_len + 5)); //把“main/”也去掉
  			} else if (filename[0]!=='.' && fs.statSync(file).isDirectory()) {
  				//排除.svn，.github之类的文件夹
  				readMainFiles(file, files);
  			}
  		});
  	}