jQuery中$.extend()数组合并用法总结


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。 


<span style="font-size:18px;"><html> 
<head> 
<title></title> 
</head> 
<body> 
<h3 class="ye">new soul</h3> 
<h3 class="ye">new soul</h3> 
<h3 class="ye">new soul</h3> 
<h3 class="ye">new soul</h3> 
<script type="text/javascript" src="jquery.2.0.3.js"></script> 
<script type="text/javascript"> 
jQuery.fn.myPlugin = function(options) { 
$options = $.extend( { 
html: "no messages", 
css: { 
"color": "red", 
"font-size":"14px" 
}}, 
options); 
return $(this).css({ 
"color": $options.css.color, 

}).html($options.html); 
} 


$('.ye').myPlugin({html:"So easy,yes?",css:{"color":"green","font-size":"20px"}}); 
</script> 
</body> 
</html> 
</span>


下面详细介绍用法

1.合并多个对象。 

这里使用的就是$.extend()的嵌套多个对象的功能。 

所谓嵌套多个对象，有点类似于数组的合并的操作。  


<span style="font-size:18px;">//用法: jQuery.extend(obj1,obj2,obj3,..) 
var Css1={size: "10px",style: "oblique"} 
var Css2={size: "12px",style: "oblique",weight: "bolder"} 
$.jQuery.extend(Css1,Css2) 
//结果:Css1的size属性被覆盖,而且继承了Css2的weight属性 
// Css1 = {size: "12px",style: "oblique",weight: "bolder"} 
</span>
2.深度嵌套对象。 



<span style="font-size:18px;"> jQuery.extend( 
{ name: “John”, location: { city: “Boston” } }, 
{ last: “Resig”, location: { state: “MA” } } 
); 
// 结果: 
// => { name: “John”, last: “Resig”, location: { state: “MA” } } 
// 新的更深入的 .extend() 
jQuery.extend( true, 
{ name: “John”, location: { city: “Boston” } }, 
{ last: “Resig”, location: { state: “MA” } } 
); 
// 结果 
// => { name: “John”, last: “Resig”, 
// location: { city: “Boston”, state: “MA” } } 
</span>
3.给jQuery添加静态方法 



<span style="font-size:18px;"><html> 
<head> 
<title></title> 
</head> 
<body> 
<script type="text/javascript" src="jquery.2.0.3.js"></script> 
<script type="text/javascript"> 
$.extend({ 
add:function(a,b){return a+b;}, 
minus:function(a,b){return a-b}, 
multiply:function(a,b){return a*b;}, 
divide:function(a,b){return Math.floor(a/b);} 
}); 

var sum = $.add(3,5)+$.minus(3,5)+$.multiply(3,5)+$.divide(5,7); 
console.log(sum); 
</script> 
</body> 
</html></span>