jQuery为开发插件提拱了两个方法，分别是：
jQuery.fn.extend(object);
jQuery.extend(object);
jQuery.extend(object);为扩展jQuery类本身.为类添加新的方法。
jQuery.fn.extend(object);给jQuery对象添加方法
jQuery.extend()方法
1 <div id="log"></div> 2 <script> 3 $(function () { 4 var object1 = { 5 apple: 0, 6 banana: {weight: 52, price: 100}, 7 cherry: 97 8 }; 9 var object2 = { 10 banana: {price: 200}, 11 durian: 100 12 }; 13 /* object2 合并到 object1 中 */ 14 $.extend(object1, object2); 15 var printObj = typeof JSON != "undefined" ? JSON.stringify : function(obj) { 16 var arr = []; 17 $.each(obj, function(key, val) { 18 var next = key + ": "; 19 next += $.isPlainObject(val) ? printObj(val) : val; 20 arr.push( next ); 21 }); 22 return "{ " + arr.join(", ") + " }"; 23 }; 24 $("#log").append( printObj(object1) ); 25 }) 26 </script>
给jquery添加静态方法
1 <span style="font-size:18px;"><html> 2 <head> 3 <title></title> 4 </head> 5 <body> 6 <script type="text/javascript" src="jquery.2.0.3.js"></script> 7 <script type="text/javascript"> 8 $.extend({ 9 add:function(a,b){return a+b;}, 10 minus:function(a,b){return a-b}, 11 multiply:function(a,b){return a*b;}, 12 divide:function(a,b){return Math.floor(a/b);} 13 }); 14 15 var sum = $.add(3,5)+$.minus(3,5)+$.multiply(3,5)+$.divide(5,7); 16 console.log(sum); 17 </script> 18 </body> 19 </html></span>
其他的也不一一写，中文文档
jQuery.fn.extend()
1 <span style="font-size:18px;"><html> 2 <head> 3 <title></title> 4 </head> 5 <body> 6 <h3 class="ye">new soul</h3> 7 <h3 class="ye">new soul</h3> 8 <h3 class="ye">new soul</h3> 9 <h3 class="ye">new soul</h3> 10 <script type="text/javascript" src="jquery.2.0.3.js"></script> 11 <script type="text/javascript"> 12 jQuery.fn.myPlugin = function(options) { 13 $options = $.extend( { 14 html: "no messages", 15 css: { 16 "color": "red", 17 "font-size":"14px" 18 }}, 19 options); 20 return $(this).css({ 21 "color": $options.css.color, 22 23 }).html($options.html); 24 } 25 26 27 $('.ye').myPlugin({html:"So easy,yes?",css:{"color":"green","font-size":"20px"}}); 28 </script> 29 </body> 30 </html> 31 </span>
以及这个写的很好的文章
extend()很好用，js避不过去