partial

_.partial(func, [partials])

创建一个调用 func 的函数，并在其收到的参数前面添加 partials。此方法类似于 _.bind，只是它不会改变 this 绑定。

¥Creates a function that invokes func with partials prepended to the arguments it receives. This method is like _.bind except it does not alter the this binding.

_.partial.placeholder 值在单片构建中​​默认为 _，可用作部分应用参数的占位符。

¥The _.partial.placeholder value, which defaults to _ in monolithic builds, may be used as a placeholder for partially applied arguments.

注意：此方法不设置部分应用函数的 "length" 属性。

¥Note: This method doesn't set the "length" property of partially applied functions.

新增于

¥Since

0.2.0

参数

¥Arguments

1. func (函数)：部分应用参数的函数。

   ¥func (Function): The function to partially apply arguments to.

2. [partials] (...*)：要部分应用的参数。

   ¥[partials] (...)*: The arguments to be partially applied.

返回

¥Returns

(函数)：返回新的部分应用函数。

¥(Function): Returns the new partially applied function.

示例

¥Example

function greet(greeting, name) {
  return greeting + ' ' + name;
}

var sayHelloTo = _.partial(greet, 'hello');
sayHelloTo('fred');
// => 'hello fred'

// Partially applied with placeholders.
var greetFred = _.partial(greet, _, 'fred');
greetFred('hi');
// => 'hi fred'