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                # Objects 和`Array`類似,underscore也提供了大量針對Object的函數。 ## keys / allKeys `keys()`可以非常方便地返回一個object自身所有的key,但不包含從原型鏈繼承下來的: ``` 'use strict'; function Student(name, age) { this.name = name; this.age = age; } var xiaoming = new Student('小明', 20); _.keys(xiaoming); // ['name', 'age'] ``` `allKeys()`除了object自身的key,還包含從原型鏈繼承下來的: ``` 'use strict'; function Student(name, age) { this.name = name; this.age = age; } Student.prototype.school = 'No.1 Middle School'; var xiaoming = new Student('小明', 20); _.allKeys(xiaoming); // ['name', 'age', 'school'] ``` ## values 和`keys()`類似,`values()`返回object自身但不包含原型鏈繼承的所有值: ``` 'use strict'; var obj = { name: '小明', age: 20 }; _.values(obj); // ['小明', 20] ``` 注意,沒有`allValues()`,原因我也不知道。 ## mapObject `mapObject()`就是針對object的map版本: ``` 'use strict'; var obj = { a: 1, b: 2, c: 3 }; // 注意傳入的函數簽名,value在前,key在后: _.mapObject(obj, (v, k) => 100 + v); // { a: 101, b: 102, c: 103 } ``` ## invert `invert()`把object的每個key-value來個交換,key變成value,value變成key: ``` 'use strict'; var obj = { Adam: 90, Lisa: 85, Bart: 59 }; _.invert(obj); // { '59': 'Bart', '85': 'Lisa', '90': 'Adam' } ``` ## extend / extendOwn `extend()`把多個object的key-value合并到第一個object并返回: ``` 'use strict'; var a = {name: 'Bob', age: 20}; _.extend(a, {age: 15}, {age: 88, city: 'Beijing'}); // {name: 'Bob', age: 88, city: 'Beijing'} // 變量a的內容也改變了: a; // {name: 'Bob', age: 88, city: 'Beijing'} ``` 注意:如果有相同的key,后面的object的value將覆蓋前面的object的value。 `extendOwn()`和`extend()`類似,但獲取屬性時忽略從原型鏈繼承下來的屬性。 ## clone 如果我們要復制一個object對象,就可以用`clone()`方法,它會把原有對象的所有屬性都復制到新的對象中: ``` 'use strict'; var source = { name: '小明', age: 20, skills: ['JavaScript', 'CSS', 'HTML'] }; var copied = _.clone(source); alert(JSON.stringify(copied, null, ' ')); ``` 注意,`clone()`是“淺復制”。所謂“淺復制”就是說,兩個對象相同的key所引用的value其實是同一對象: ``` source.skills === copied.skills; // true ``` 也就是說,修改`source.skills`會影響`copied.skills`。 ## isEqual `isEqual()`對兩個object進行深度比較,如果內容完全相同,則返回`true`: ``` 'use strict'; var o1 = { name: 'Bob', skills: { Java: 90, JavaScript: 99 }}; var o2 = { name: 'Bob', skills: { JavaScript: 99, Java: 90 }}; o1 === o2; // false _.isEqual(o1, o2); // true ``` `isEqual()`其實對`Array`也可以比較: ``` 'use strict'; var o1 = ['Bob', { skills: ['Java', 'JavaScript'] }]; var o2 = ['Bob', { skills: ['Java', 'JavaScript'] }]; o1 === o2; // false _.isEqual(o1, o2); // true ``` 更多完整的函數請參考underscore的文檔:[http://underscorejs.org/#objects](http://underscorejs.org/#objects)
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