freeCodeCamp/adding-a-default-option-in-switch-statements.chinese.md at 00446ffb1758af30d51a3dc664c20c43244bcdcb

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Randell Dawson 772d775fe3 fix: removed guideUrl from frontmatter non-English

2019-02-19 11:34:27 +03:00

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id, title, challengeType, videoUrl, localeTitle

id	title	challengeType	videoUrl	localeTitle
56533eb9ac21ba0edf2244de	Adding a Default Option in Switch Statements	1		在交换机语句中添加默认选项

Description

在switch语句中，您可能无法将所有可能的值指定为case语句。相反，您可以添加default语句，如果找不到匹配的case语句，将执行该语句。可以把它想象成if/else链中的最后一个else语句。 default语句应该是最后一种情况。

switch（num）{
案例值1：
语句1;
打破;
案例值2：
语句2;
打破;
...
默认：
defaultStatement;
打破;
}

Instructions

写一个switch语句来设置以下条件的answer ：
"a" - “苹果”
"b" - “鸟”
"c" - “猫”
default - “东西”

Tests

tests:
  - text: <code>switchOfStuff(&quot;a&quot;)</code>的值应为“apple”
    testString: 'assert(switchOfStuff("a") === "apple", "<code>switchOfStuff("a")</code> should have a value of "apple"");'
  - text: <code>switchOfStuff(&quot;b&quot;)</code>的值应为“bird”
    testString: 'assert(switchOfStuff("b") === "bird", "<code>switchOfStuff("b")</code> should have a value of "bird"");'
  - text: <code>switchOfStuff(&quot;c&quot;)</code>的值应为“cat”
    testString: 'assert(switchOfStuff("c") === "cat", "<code>switchOfStuff("c")</code> should have a value of "cat"");'
  - text: <code>switchOfStuff(&quot;d&quot;)</code>的值应为“stuff”
    testString: 'assert(switchOfStuff("d") === "stuff", "<code>switchOfStuff("d")</code> should have a value of "stuff"");'
  - text: <code>switchOfStuff(4)</code>的值应为“stuff”
    testString: 'assert(switchOfStuff(4) === "stuff", "<code>switchOfStuff(4)</code> should have a value of "stuff"");'
  - text: 您不应该使用任何<code>if</code>或<code>else</code>语句
    testString: 'assert(!/else/g.test(code) || !/if/g.test(code), "You should not use any <code>if</code> or <code>else</code> statements");'
  - text: 您应该使用<code>default</code>语句
    testString: 'assert(switchOfStuff("string-to-trigger-default-case") === "stuff", "You should use a <code>default</code> statement");'
  - text: 你应该至少有3个<code>break</code>语句
    testString: 'assert(code.match(/break/g).length > 2, "You should have at least 3 <code>break</code> statements");'

Challenge Seed

function switchOfStuff(val) {
  var answer = "";
  // Only change code below this line



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

// Change this value to test
switchOfStuff(1);

Solution

// solution required

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