jQuery extendネーミングスペースeachなどの説明

1.extend拡張
①基本拡張

extend(dest,src1,src2,src3...);
var newSrc=$.extend({},src1,src2,src3...)//    "{}"  dest  

var result=$.extend({},{name:"Tom",age:21},{name:"Jerry",sex:"Boy"})

result={name:"Jerry",age:21,sex:"Boy"

 
   
  
  ② 省略dest参数
 
   
  
 $.extend({
  hello:function(){alert('hello');}
  });//   jQuery     
  
$.fn.extend({
  hello:function(){alert('hello');}
 });//   jQuery     
  
   
   $(document).ready(function (){
		$.extend({jqueryAlert:function(){alert("jQuery method!");}});
		$.fn.extend({        
		    alertWhileClick:function(){
		    alert("jQuery  method!");    
		     }        
		}); 
		$.jqueryAlert();
	});
   //  
  
③基本的な拡張と深い拡張
//    ;
 var newSrc1 = jQuery.extend(   
    { name: "jonh", location: { city: "Boston" } },   
    { last: "Resig", location: { state: "MA" } }   
  );  
 alert(newSrc1.location.city); 
 
//    ;
   var newSrc2 = jQuery.extend( true,   
  { name: "John", location: { city: "Boston" } },   
    { last: "Resig", location: { state: "MA" } }   
 ); 
   alert(newSrc2.location.city);
深く拡張すると、locationのプロパティは2つになりますが、基本的な拡張は確実に上書きされます.
2.ネーミングスペース
①netにjsonデータがある
 $.extend({net:[{name:"ggf"},{name:"jack"}]});
   $.extend($.net,{
    hello:function(){alert('hello');}
   });
   $(document).ready(function(){$.net.hello();alert($.net[1].name);});
②netにjsonデータがありません
 $.extend({net:{}});
   $.extend($.net,{
    hello:function(){alert('hello');}
   });
   $(document).ready(function(){$.net.hello();alert($.net[1].name);});
  
3.jQuery each関数
$.each([1,2,3],function(i,val){
	//var         ;
	//alert(i);  
	//alert(val); 
});
var obj = { one:"o", two:"t", three:"r", four:"f"};     
$.each(obj, function(key, val) {    
	//alert(val.one);error
    //alert(val.key);error
    //alert(obj.key);error
    //alert(obj.one);o o o o 
     //alert(key);  one two three four
     //alert(val);o t r f
}); 
var obj2 = [{name:"Jack",age:22},{name:"Marry",age:21}];
$.each(obj2, function(key, val) { 
	//alert(key);1 2
	//alert(val.name);Jack Marry
	//alert(obj2[1].age);
}); 
}