(function(){  var	jQuery = function( ) {return new jQuery.init( );}; 	//1jQuery.prototype =     {	init:function(){},	fx:function(){		alert(‘这是类库的一个实例化方法[fx]‘);		         }	}; //2jQuery.prototype.init.prototype = jQuery.prototype; //3window.doll= window._ = jQuery;	//4})()doll().fx();