JQuery$.extend()用法

1.合并多个对象。

<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.可以给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>

巴特西

JQuery$.extend()用法

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