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                ## bindKey + [link](./bindKey "Link to this entry.") + [source](https://github.com/lodash/lodash/blob/4.5.0正式版/lodash.src.js#L8475 "View in source.") + [npm](https://www.npmjs.com/package/lodash.bindkey "See the npm package.") ``` _.bindKey(object, key, [partials]) ``` 創建一個函數。 該方法綁定 `object[key]` 的方法。 任何附加在 `_.bindKey` 的參數會預設到該綁定函數上。 這個方法與 `_.bind` 的不同之處在于允許重寫綁定函數即使它還不存在。 瀏覽 [Peter Michaux's article](http://peter.michaux.ca/articles/lazy-function-definition-pattern) 了解更多詳情。 這個 `_.bindKey.placeholder` 的值,默認是以 `_` 作為附加部分參數的占位符。 ### 參數 1. object (Object) 需要綁定函數的對象 2. key (string) 需要綁定函數對象的鍵 3. [partials] (...*) 附加的部分參數 ### 返回值 (Function) 返回新的綁定函數 ### 示例 ``` 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!' // 使用了占位符 var bound = _.bindKey(object, 'greet', _, '!'); bound('hi'); // => 'hiya fred!' ```
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