ee1e8abd87
* feat(tools): add seed/solution restore script * chore(curriculum): remove empty sections' markers * chore(curriculum): add seed + solution to Chinese * chore: remove old formatter * fix: update getChallenges parse translated challenges separately, without reference to the source * chore(curriculum): add dashedName to English * chore(curriculum): add dashedName to Chinese * refactor: remove unused challenge property 'name' * fix: relax dashedName requirement * fix: stray tag Remove stray `pre` tag from challenge file. Signed-off-by: nhcarrigan <nhcarrigan@gmail.com> Co-authored-by: nhcarrigan <nhcarrigan@gmail.com>
79 lines
1.4 KiB
Markdown
79 lines
1.4 KiB
Markdown
---
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id: 587d7b7e367417b2b2512b22
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title: 使用 parseInt 函数并传入一个基数
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challengeType: 1
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videoUrl: 'https://scrimba.com/c/c6K4Kh3'
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forumTopicId: 301182
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dashedName: use-the-parseint-function-with-a-radix
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---
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# --description--
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`parseInt()`函数解析一个字符串并返回一个整数。它同时可接受第二个参数，一个介于2和36之间的整数，表示字符串的基数。
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函数调用如下所示：
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`parseInt(string, radix);`
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示例：
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`var a = parseInt("11", 2);`
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参数 2 表示 "11" 使用二进制数值系统。此示例将字符串 "11" 转换为整数 3。
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# --instructions--
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在`convertToIntegerparseInt()`函数把二进制数转换成十进制并返回。
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# --hints--
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`convertToInteger`中应该使用`parseInt()`函数。
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```js
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assert(/parseInt/g.test(code));
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```
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`convertToInteger("10011")`应该返回一个数字。
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```js
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assert(typeof convertToInteger('10011') === 'number');
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```
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`convertToInteger("10011")`应该返回 19。
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```js
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assert(convertToInteger('10011') === 19);
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```
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`convertToInteger("111001")`应该返回 57。
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```js
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assert(convertToInteger('111001') === 57);
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```
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`convertToInteger("JamesBond")`应该返回 NaN。
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```js
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assert.isNaN(convertToInteger('JamesBond'));
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```
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# --seed--
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## --seed-contents--
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```js
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function convertToInteger(str) {
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}
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convertToInteger("10011");
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```
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# --solutions--
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```js
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function convertToInteger(str) {
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return parseInt(str, 2);
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}
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```
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