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返回值:Object
jQuery.extend([deep], target, object1, [objectN])
概述
用一个或多个其他对象来扩展一个对象，返回被扩展的对象。
如果不指定target，则给jQuery命名空间本身进行扩展。这有助于插件作者为jQuery增加新方法。 如果第一个参数设置为true，则jQuery返回一个深层次的副本，递归地复制找到的任何对象。否则的话，副本会与原对象共享结构。 未定义的属性将不会被复制，然而从对象的原型继承的属性将会被复制。
参数
target,[object1],[objectN]Object,Object,Object V1.0
target:一个对象，如果附加的对象被传递给这个方法将那么它将接收新的属性，如果它是唯一的参数将扩展jQuery的命名空间。
object1:待合并到第一个对象的对象。
objectN:待合并到第一个对象的对象。
[deep],target,object1,[objectN]Object,Object,Object,ObjectV1.1.4
deep:如果设为true，则递归合并。
target:待修改对象。
object1:待合并到第一个对象的对象。
objectN:待合并到第一个对象的对象。
示例
描述:
合并 settings 和 options，修改并返回 settings。
jQuery 代码:
var settings = { validate: false, limit: 5, name: "foo" };
var options = { validate: true, name: "bar" };
jQuery.extend(settings, options);结果:
settings == { validate: true, limit: 5, name: "bar" }描述:
合并 defaults 和 options, 不修改 defaults。
jQuery 代码:
var empty = {};
var defaults = { validate: false, limit: 5, name: "foo" };
var options = { validate: true, name: "bar" };
var settings = jQuery.extend(empty, defaults, options);结果:
settings == { validate: true, limit: 5, name: "bar" }
empty == { validate: true, limit: 5, name: "bar" }