最近在研究jQuery。把jQuery.extend扩展函数的用法记录下来。
1、扩展jQuery静态方法.
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$.extend({
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test:function(){alert('test函数')}
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})
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用法: $.test()
2、合并多个对象.
为jQuery.extend(css1,css2)为例,css1,css2个有一些属性(法照样会比处理,这里之讲属性).
extend函数会把css2有而css2没有的属性加到css1中,如果css2的某个属性与css1的某个属性名称享用,就会用css2的属性去覆盖css1的同名属性。css1就是最后的整和对象。或者也可以用 :
var newcss = jquery.extend(css1,css2) newcss就是合并的新对象。
var newcss = jquery.extend({},css1,css2) newcss就是合并的新对象.而且没有破坏css1的结构。
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//用法: jQuery.extend(obj1,obj2,obj3,
..)
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var Css1={size: "10px",style: "oblique"}
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var Css2={size: "12px",style: "oblique",weight: "bolder"}
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$.jQuery.extend(Css1,Css2)
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//结果:Css1的size属性被覆盖,而且继承了Css2的weight属性
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// Css1 = {size: "12px",style: "oblique",weight: "bolder"}
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3。深度镶套对象
新的extend()允许你更深度的合并镶套对象。下面的例子是一个很好的证明。
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// 以前的 .extend()
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jQuery.extend(
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{ name: “John”, location: { city: “Boston” } },
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{ last: “Resig”, location: { state: “MA” } }
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);
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// 结果:
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// => { name: “John”, last: “Resig”, location: { state: “MA” } }
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// 新的更深入的 .extend()
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jQuery.extend( true,
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{ name: “John”, location: { city: “Boston” } },
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{ last: “Resig”, location: { state: “MA” } }
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);
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// 结果
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// => { name: “John”, last: “Resig”,
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// location: { city: “Boston”, state: “MA” } }
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