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

id, challengeType, videoUrl, forumTopicId, title

id	challengeType	videoUrl	forumTopicId	title
56533eb9ac21ba0edf2244d7	1	https://scrimba.com/c/cNVR7Am	16788	小于或等于运算符

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

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。

Tests

tests:
  - text: <code>testLessOrEqual(0)</code>应该返回 "Smaller Than or Equal to 12"。
    testString: assert(testLessOrEqual(0) === "Smaller Than or Equal to 12");
  - text: <code>testLessOrEqual(11)</code>应该返回 "Smaller Than or Equal to 12"。
    testString: assert(testLessOrEqual(11) === "Smaller Than or Equal to 12");
  - text: <code>testLessOrEqual(12)</code>应该返回 "Smaller Than or Equal to 12"。
    testString: assert(testLessOrEqual(12) === "Smaller Than or Equal to 12");
  - text: <code>testLessOrEqual(23)</code>应该返回 "Smaller Than or Equal to 24"。
    testString: assert(testLessOrEqual(23) === "Smaller Than or Equal to 24");
  - text: <code>testLessOrEqual(24)</code>应该返回 "Smaller Than or Equal to 24"。
    testString: assert(testLessOrEqual(24) === "Smaller Than or Equal to 24");
  - text: <code>testLessOrEqual(25)</code>应该返回 "More Than 24"。
    testString: assert(testLessOrEqual(25) === "More Than 24");
  - text: <code>testLessOrEqual(55)</code>应该返回 "More Than 24"。
    testString: assert(testLessOrEqual(55) === "More Than 24");
  - text: 你应该使用<code>&lt;=</code>运算符至少两。
    testString: assert(code.match(/val\s*<=\s*('|")*\d+('|")*/g).length > 1);

Challenge Seed

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";
}

// Change this value to test
testLessOrEqual(10);

Solution

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";
}