2018-10-10 18:03:03 -04:00
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---
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id: 587d7b85367417b2b2512b3a
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challengeType: 1
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2020-09-07 16:09:54 +08:00
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forumTopicId: 301184
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localeTitle: 调用函数时,捕获以错误顺序传递的参数
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2018-10-10 18:03:03 -04:00
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---
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## Description
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2020-09-07 16:09:54 +08:00
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<section id='description'>
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继续讨论调用函数,需要注意的下一个 bug 是函数的参数传递顺序错误。 如果参数分别是不同的类型,例如接受数组和整数两个参数的函数,参数顺序传错就可能会引发运行时错误。对于接受相同类型参数的函数,传错参数也会导致逻辑错误或运行结果错误。确保以正确的顺序提供所有必需的参数以避免这些问题。
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</section>
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2018-10-10 18:03:03 -04:00
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## Instructions
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2020-09-07 16:09:54 +08:00
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<section id='instructions'>
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函数<code>raiseToPower</code>返回基数 (base) 的指数 (exponent) 次幂。不幸的是,它没有被正确调用 ———— 修改代码,使<code>power</code>的值为 8。
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</section>
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2018-10-10 18:03:03 -04:00
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## Tests
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<section id='tests'>
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```yml
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tests:
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2020-09-07 16:09:54 +08:00
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- text: 你应修复变量<code>power</code>,使其等于 2 的 3 次方,而不是 3 的 2 次方。
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2020-02-18 01:40:55 +09:00
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testString: assert(power == 8);
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2020-09-07 16:09:54 +08:00
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- text: 你调用<code>raiseToPower</code>函数时,传递参数的顺序应正确。
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2020-02-18 01:40:55 +09:00
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testString: assert(code.match(/raiseToPower\(\s*?base\s*?,\s*?exp\s*?\);/g));
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2018-10-10 18:03:03 -04:00
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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function raiseToPower(b, e) {
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return Math.pow(b, e);
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}
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let base = 2;
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let exp = 3;
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let power = raiseToPower(exp, base);
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console.log(power);
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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2020-09-07 16:09:54 +08:00
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function raiseToPower(b, e) {
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return Math.pow(b, e);
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}
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let base = 2;
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let exp = 3;
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let power = raiseToPower(base, exp);
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console.log(power);
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2018-10-10 18:03:03 -04:00
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```
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2020-08-13 17:24:35 +02:00
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2020-09-07 16:09:54 +08:00
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</section>
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