code: function( str , dest ){
  		var _spilt 	= "cb==cb",
  			_imgs 	= str.replace( /\s+/gi , " " ).replace( /url\(([^\)]*)\)/gi , _spilt + "$1" + _spilt ).split( _spilt ),
  			_md5,
  			_dest;
  		for( var i = _imgs.length; i--; ){
  			if( i % 2 ){
  				_img 	= tool.get_resource_path( _imgs[ i ].replace( /[\'|\"|\s]*/gi , "" ) , dest );
  				if( !grunt.file.exists( _img ) ){
  					continue;
  				};
  				if( !config.resources[ _img ] ){
  					_md5 	= [
  						"resources/",
  						tool.md5( config.md5 + new Date().getTime() + parseInt( Math.random() * 999999999 ) ),
  						_img.replace( /.*(\..*)$/gi , "$1" )
  					].join( "" );
  					config.resources[ _img ] = _md5;
  				} else {
  					_md5 = config.resources[ _img ];
  				};
  				_imgs[ i ] = "url('../" + _md5 + "')";
  			};
  		};
  		return _imgs.join( "" );
  	}
docs: /*!
  修正对应内容的图片/其它资源的引用
  @str 	{string} 	内容
  @dest 	{string} 	目标文件地址
  return 	修正后的内容