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

---
id: 56533eb9ac21ba0edf2244da
challengeType: 1
videoUrl: 'https://scrimba.com/c/cek4Efq'
forumTopicId: 18207
localeTitle: 介绍 else 语句
---

## Description
<section id='description'>
当<code>if</code>语句的条件为真，大括号里的代码执行，那如果条件为假呢？正常情况下什么也不会发生。使用else语句，可以执行当条件为假时相应的代码。

```js
if (num > 10) {
  return "Bigger than 10";
} else {
  return "10 or Less";
}
```

</section>

## Instructions
<section id='instructions'>
请把多个<code>if</code>语句合并为一个<code>if/else</code>语句。
</section>

## Tests
<section id='tests'>

```yml
tests:
  - text: 你应该只有一个<code>if</code>表达式。
    testString: assert(code.match(/if/g).length === 1);
  - text: 你应该使用一个<code>else</code>表达式。
    testString: assert(/else/g.test(code));
  - text: <code>testElse(4)</code>应该返回 "5 or Smaller"。
    testString: assert(testElse(4) === "5 or Smaller");
  - text: <code>testElse(5)</code>应该返回 "5 or Smaller"。
    testString: assert(testElse(5) === "5 or Smaller");
  - text: <code>testElse(6)</code>应该返回 "Bigger than 5"。
    testString: assert(testElse(6) === "Bigger than 5");
  - text: <code>testElse(10)</code>应该返回 "Bigger than 5"。
    testString: assert(testElse(10) === "Bigger than 5");
  - text: 不要修改上面和下面的代码。
    testString: assert(/var result = "";/.test(code) && /return result;/.test(code));

```

</section>

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

<div id='js-seed'>

```js
function testElse(val) {
  var result = "";
  // Only change code below this line

  if (val > 5) {
    result = "Bigger than 5";
  }

  if (val <= 5) {
    result = "5 or Smaller";
  }

  // Only change code above this line
  return result;
}

// Change this value to test
testElse(4);

```

</div>



</section>

## Solution
<section id='solution'>


```js
function testElse(val) {
  var result = "";
  if(val > 5) {
    result = "Bigger than 5";
  } else {
    result = "5 or Smaller";
  }
  return result;
}
```

</section>