bind

_.bind(func, thisArg, [partials])

创建一个函数，使用 this 绑定调用 func，并在其接收的参数前面添加 thisArg 和 partials。

¥Creates a function that invokes func with the this binding of thisArg and partials prepended to the arguments it receives.

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

注意：与原生 Function#bind 不同，此方法不设置绑定函数的 "length" 属性。

¥Note: Unlike native Function#bind, this method doesn't set the "length" property of bound functions.

新增于

¥Since

0.1.0

参数

¥Arguments

1. func (函数)：要绑定的函数。

   ¥func (Function): The function to bind.

2. thisArg (*):func 的 this 绑定。

   ¥thisArg ()*: The this binding of func.

3. [partials] (...*)：要部分应用的参数。

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

返回

¥Returns

(函数)：返回新的绑定函数。

¥(Function): Returns the new bound function.

示例

¥Example

function greet(greeting, punctuation) {
  return greeting + ' ' + this.user + punctuation;
}

var object = { 'user': 'fred' };

var bound = _.bind(greet, object, 'hi');
bound('!');
// => 'hi fred!'

// Bound with placeholders.
var bound = _.bind(greet, object, _, '!');
bound('hi');
// => 'hi fred!'