freeCodeCamp/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-less-than-or-equal-to-operator.md

---
id: 56533eb9ac21ba0edf2244d7
title: 小于或等于运算符
challengeType: 1
videoUrl: 'https://scrimba.com/c/cNVR7Am'
forumTopicId: 16788
dashedName: comparison-with-the-less-than-or-equal-to-operator
---

# --description--

使用`小于等于`运算符（`<=`）比较两个数字的大小。如果在小于等于运算符左边的数字小于或者等于右边的数字，它会返回`true`。如果在小于等于运算符左边的数字大于右边的数字，它会返回`false`。与相等运算符类似，`小于等于`运算符会转换数据类型。

**例如**

```js
4   <= 5  // true
'7' <= 7  // true
5   <= 5  // true
3   <= 2  // false
'8' <= 4  // false
```

# --instructions--

添加`小于等于`运算符到指定行，使得函数的返回语句有意义。

# --hints--

`testLessOrEqual(0)`应该返回 "Smaller Than or Equal to 12"。

```js
assert(testLessOrEqual(0) === 'Smaller Than or Equal to 12');
```

`testLessOrEqual(11)`应该返回 "Smaller Than or Equal to 12"。

```js
assert(testLessOrEqual(11) === 'Smaller Than or Equal to 12');
```

`testLessOrEqual(12)`应该返回 "Smaller Than or Equal to 12"。

```js
assert(testLessOrEqual(12) === 'Smaller Than or Equal to 12');
```

`testLessOrEqual(23)`应该返回 "Smaller Than or Equal to 24"。

```js
assert(testLessOrEqual(23) === 'Smaller Than or Equal to 24');
```

`testLessOrEqual(24)`应该返回 "Smaller Than or Equal to 24"。

```js
assert(testLessOrEqual(24) === 'Smaller Than or Equal to 24');
```

`testLessOrEqual(25)`应该返回 "More Than 24"。

```js
assert(testLessOrEqual(25) === 'More Than 24');
```

`testLessOrEqual(55)`应该返回 "More Than 24"。

```js
assert(testLessOrEqual(55) === 'More Than 24');
```

你应该使用`<=`运算符至少两。

```js
assert(code.match(/val\s*<=\s*('|")*\d+('|")*/g).length > 1);
```

# --seed--

## --seed-contents--

```js
function testLessOrEqual(val) {
  if (val) {  // Change this line
    return "Smaller Than or Equal to 12";
  }

  if (val) {  // Change this line
    return "Smaller Than or Equal to 24";
  }

  return "More Than 24";
}

testLessOrEqual(10);
```

# --solutions--

```js
function testLessOrEqual(val) {
  if (val <= 12) {  // Change this line
    return "Smaller Than or Equal to 12";
  }

  if (val <= 24) {  // Change this line
    return "Smaller Than or Equal to 24";
  }

  return "More Than 24";
}
```