bindKey

_.bindKey(object, key, [partials])

创建一个调用 object[key] 处的方法的函数，并在其接收的参数前面添加 partials。

¥Creates a function that invokes the method at object[key] with partials prepended to the arguments it receives.

此方法与 _.bind 不同，它允许绑定函数引用可能被重新定义或尚不存在的方法。有关更多详细信息，请参阅 Peter Michaux 的文章。

¥This method differs from _.bind by allowing bound functions to reference methods that may be redefined or don't yet exist. See Peter Michaux's article for more details.

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

新增于

¥Since

0.10.0

参数

¥Arguments

1. object (对象)：要在其上调用方法的对象。

   ¥object (Object): The object to invoke the method on.

2. key (字符串)：方法的键。

   ¥key (string): The key of the method.

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

var object = {
  'user': 'fred',
  'greet': function(greeting, punctuation) {
    return greeting + ' ' + this.user + punctuation;
  }
};

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

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

bound('!');
// => 'hiya fred!'

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