freeCodeCamp/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-javascript/introducing-else-if-statements.md

---
id: 56533eb9ac21ba0edf2244db
challengeType: 1
videoUrl: 'https://scrimba.com/c/caeJ2hm'
forumTopicId: 18206
localeTitle: 介绍 else if 语句
---

## Description
<section id='description'>
如果你有多个条件语句，你可以通过<code>else if</code>语句把<code>if</code>语句链起来。

```js
if (num > 15) {
  return "Bigger than 15";
} else if (num < 5) {
  return "Smaller than 5";
} else {
  return "Between 5 and 15";
}
```

</section>

## Instructions
<section id='instructions'>
使用<code>if else</code>实现同样的效果。
</section>

## Tests
<section id='tests'>

```yml
tests:
  - text: 你应该至少有两个<code>else</code>表达式。
    testString: assert(code.match(/else/g).length > 1);
  - text: 你应该至少有两个<code>if</code>表达式。
    testString: assert(code.match(/if/g).length > 1);
  - text: <code>testElseIf(0)</code>应该返回 "Smaller than 5"。
    testString: assert(testElseIf(0) === "Smaller than 5");
  - text: <code>testElseIf(5)</code>应该返回 "Between 5 and 10"。
    testString: assert(testElseIf(5) === "Between 5 and 10");
  - text: <code>testElseIf(7)</code>应该返回 "Between 5 and 10"。
    testString: assert(testElseIf(7) === "Between 5 and 10");
  - text: <code>testElseIf(10)</code>应该返回 "Between 5 and 10"。
    testString: assert(testElseIf(10) === "Between 5 and 10");
  - text: <code>testElseIf(12)</code>应该返回 "Greater than 10"。
    testString: assert(testElseIf(12) === "Greater than 10");
  - text: <code>testElseIf(12)</code> 应该返回 "Greater than 10"。
    testString: assert(testElseIf(12) === "Greater than 10");

```

</section>

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

<div id='js-seed'>

```js
function testElseIf(val) {
  if (val > 10) {
    return "Greater than 10";
  }

  if (val < 5) {
    return "Smaller than 5";
  }

  return "Between 5 and 10";
}

// Change this value to test
testElseIf(7);

```

</div>



</section>

## Solution
<section id='solution'>


```js
function testElseIf(val) {
  if(val > 10) {
    return "Greater than 10";
  } else if(val < 5) {
    return "Smaller than 5";
  } else {
    return "Between 5 and 10";
  }
}
```

</section>