62 lines
1.4 KiB
Markdown
62 lines
1.4 KiB
Markdown
|
---
|
||
|
|
id: cf1391c1c11feddfaeb4bdef
|
||
|
|
title: Create Decimal Numbers with JavaScript
|
||
|
|
challengeType: 1
|
||
|
|
videoUrl: ''
|
||
|
|
localeTitle: 使用JavaScript创建十进制数
|
||
|
|
---
|
||
|
|
|
||
|
|
## Description
|
||
|
|
<section id="description">我们也可以在变量中存储十进制数。十进制数有时称为<dfn>浮点数</dfn>或<dfn>浮点数</dfn> 。 <strong>注意</strong> <br>并非所有实数都可以准确地以<dfn>浮点</dfn>表示。这可能导致舍入错误。 <a href="https://en.wikipedia.org/wiki/Floating_point#Accuracy_problems" target="_blank">细节在这里</a> 。 </section>
|
||
|
|
|
||
|
|
## Instructions
|
||
|
|
<section id="instructions">创建一个变量<code>myDecimal</code>并给它一个带小数部分的十进制值（例如<code>5.7</code> ）。 </section>
|
||
|
|
|
||
|
|
## Tests
|
||
|
|
<section id='tests'>
|
||
|
|
|
||
|
|
```yml
|
||
|
|
tests:
|
||
|
|
- text: <code>myDecimal</code>应该是一个数字。
|
||
|
|
testString: 'assert(typeof myDecimal === "number", "<code>myDecimal</code> should be a number.");'
|
||
|
|
- text: <code>myDecimal</code>应该有一个小数点
|
||
|
|
testString: 'assert(myDecimal % 1 != 0, "<code>myDecimal</code> should have a decimal point"); '
|
||
|
|
|
||
|
|
```
|
||
|
|
|
||
|
|
</section>
|
||
|
|
|
||
|
|
## Challenge Seed
|
||
|
|
<section id='challengeSeed'>
|
||
|
|
|
||
|
|
<div id='js-seed'>
|
||
|
|
|
||
|
|
```js
|
||
|
|
var ourDecimal = 5.7;
|
||
|
|
|
||
|
|
// Only change code below this line
|
||
|
|
|
||
|
|
```
|
||
|
|
|
||
|
|
</div>
|
||
|
|
|
||
|
|
|
||
|
|
### After Test
|
||
|
|
<div id='js-teardown'>
|
||
|
|
|
||
|
|
```js
|
||
|
|
console.info('after the test');
|
||
|
|
```
|
||
|
|
|
||
|
|
</div>
|
||
|
|
|
||
|
|
</section>
|
||
|
|
|
||
|
|
## Solution
|
||
|
|
<section id='solution'>
|
||
|
|
|
||
|
|
```js
|
||
|
|
// solution required
|
||
|
|
```
|
||
|
|
</section>
|