64 lines
1.9 KiB
Markdown
64 lines
1.9 KiB
Markdown
---
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id: 587d7b8b367417b2b2512b50
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title: Write Concise Declarative Functions with ES6
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challengeType: 1
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videoUrl: ''
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localeTitle: 用ES6编写简明的声明函数
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---
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## Description
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<section id="description">在ES5中定义对象内的函数时，我们必须使用关键字<code>function</code> ，如下所示： <blockquote> const person = { <br>名称：“泰勒”， <br> sayHello：function（）{ <br>回来`你好！我的名字是$ {this.name} .`; <br> } <br> }; </blockquote>使用ES6，您可以在定义对象中的函数时完全删除<code>function</code>关键字和冒号。以下是此语法的示例： <blockquote> const person = { <br>名称：“泰勒”， <br>问好（） { <br>回来`你好！我的名字是$ {this.name} .`; <br> } <br> }; </blockquote></section>
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## Instructions
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<section id="instructions">重构对象<code>bicycle</code>内的函数<code>setGear</code>以使用上述简写语法。 </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: 未使用传统函数表达式。
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testString: 'assert(!getUserInput("index").match(/function/),"Traditional <code>function</code> expression was not used.");'
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- text: <code>setGear</code>是一个声明函数。
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testString: 'assert(typeof bicycle.setGear === "function" && getUserInput("index").match(/setGear\s*\(.+\)\s*\{/), "<code>setGear</code> is a declarative function.");'
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- text: ''
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testString: 'assert((new bicycle.setGear(48)).gear === 48, "<code>bicycle.setGear(48)</code> changes the <code>gear</code> value to 48.");'
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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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// change code below this line
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const bicycle = {
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gear: 2,
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setGear: function(newGear) {
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"use strict";
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this.gear = newGear;
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}
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};
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// change code above this line
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bicycle.setGear(3);
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console.log(bicycle.gear);
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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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