---
id: a3566b1109230028080c9345
title: Sum All Numbers in a Range
isRequired: true
challengeType: 5
videoUrl: ''
localeTitle: 求和范围中的所有数字
---

## Description
<section id="description">我们将通过两个数字的数组。返回这两个数字的总和加上它们之间所有数字的总和。最低的数字并不总是第一位。如果卡住，请记得使用<a href="http://forum.freecodecamp.org/t/how-to-get-help-when-you-are-stuck/19514" target="_blank">Read-Search-Ask</a> 。尝试配对程序。编写自己的代码。 </section>

## Instructions
<section id="instructions">
</section>

## Tests
<section id='tests'>

```yml
tests:
  - text: '<code>sumAll([1, 4])</code>应该返回一个数字。'
    testString: 'assert(typeof sumAll([1, 4]) === "number", "<code>sumAll([1, 4])</code> should return a number.");'
  - text: '<code>sumAll([1, 4])</code>应该返回10。'
    testString: 'assert.deepEqual(sumAll([1, 4]), 10, "<code>sumAll([1, 4])</code> should return 10.");'
  - text: '<code>sumAll([4, 1])</code>应该返回10。'
    testString: 'assert.deepEqual(sumAll([4, 1]), 10, "<code>sumAll([4, 1])</code> should return 10.");'
  - text: '<code>sumAll([5, 10])</code>应该返回45。'
    testString: 'assert.deepEqual(sumAll([5, 10]), 45, "<code>sumAll([5, 10])</code> should return 45.");'
  - text: '<code>sumAll([10, 5])</code>应该返回45。'
    testString: 'assert.deepEqual(sumAll([10, 5]), 45, "<code>sumAll([10, 5])</code> should return 45.");'

```

</section>

## Challenge Seed
<section id='challengeSeed'>

<div id='js-seed'>

```js
function sumAll(arr) {
  return 1;
}

sumAll([1, 4]);

```

</div>



</section>

## Solution
<section id='solution'>

```js
// solution required
```
</section>