defaults

_.defaults(object, [sources])

对于所有解析为 undefined 的目标属性，将源对象的自身和继承的可枚举字符串键属性分配给目标对象。源对象从左到右应用。设置属性后，将忽略同一属性的其他值。

¥Assigns own and inherited enumerable string keyed properties of source objects to the destination object for all destination properties that resolve to undefined. Source objects are applied from left to right. Once a property is set, additional values of the same property are ignored.

注意：此方法改变 object。

¥Note: This method mutates object.

新增于

¥Since

0.1.0

参数

¥Arguments

1. object (对象)：目标对象。

   ¥object (Object): The destination object.

2. [sources] (...对象)：起始位置。

   ¥[sources] (...Object): The source objects.

返回

¥Returns

(对象)：返回 object。

¥(Object): Returns object.

示例

¥Example

_.defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
// => { 'a': 1, 'b': 2 }