58 lines
2.0 KiB
Markdown
58 lines
2.0 KiB
Markdown
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---
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id: 587d7dad367417b2b2512b75
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title: Create a Method on an Object
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challengeType: 1
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videoUrl: ''
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localeTitle: 在对象上创建方法
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---
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## Description
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<section id="description"> <code>Objects</code>可以具有特殊类型的<code>property</code> ，称为<code>method</code> 。 <code>Methods</code>是作为函数的<code>properties</code> 。这会为<code>object</code>添加不同的行为。这是一个方法的<code>duck</code>示例： <blockquote>让duck = { <br>名称：“Aflac”， <br> numLegs：2， <br> sayName：function（）{return“这个鸭子的名字是”+ duck.name +“。”;} <br> }; <br> duck.sayName（）; <br> //返回“这个鸭子的名字是Aflac。” </blockquote>该示例添加了<code>sayName</code> <code>method</code> ，该<code>method</code>是一个返回给出<code>duck</code>名称的句子的函数。请注意，该<code>method</code>使用<code>duck.name</code>访问return语句中的<code>name</code>属性。下一个挑战将包括另一种方法。 </section>
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## Instructions
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<section id="instructions">使用<code>dog</code> <code>object</code> ，给它一个名为<code>sayLegs</code>的方法。该方法应该返回句子“这条狗有4条腿”。 </section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: <code>dog.sayLegs()</code>应该是一个函数。
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testString: 'assert(typeof(dog.sayLegs) === "function", "<code>dog.sayLegs()</code> should be a function.");'
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- text: <code>dog.sayLegs()</code>应返回给定的字符串 - 请注意标点符号和间距很重要。
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testString: 'assert(dog.sayLegs() === "This dog has 4 legs.", "<code>dog.sayLegs()</code> should return the given string - note that punctuation and spacing matter.");'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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let dog = {
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name: "Spot",
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numLegs: 4,
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};
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dog.sayLegs();
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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</section>
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