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

id, challengeType, videoUrl, forumTopicId, title

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

Description

如果你有多个条件语句，你可以通过else if语句把if语句链起来。

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

Instructions

使用if else实现同样的效果。

Tests

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");

Challenge Seed

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);

Solution

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