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如何用第三个响应来回答我的JavaScript问题?

html javascript

-3

teacosts · 技术社区 · 5 年前

我正在学习JavaScript,我创建了一个简单的脚本,它会问你工作了多少小时。然后,它将显示您是否工作足够,然后显示您之前输入的号码。

我做了前两行

if (hours > 18) {
    alert('You have worked enough hours, thank you,');
} else if (hours < 18) {
    alert('You have not worked enough hours.');
}

效果很好。但随后我添加了第三行:

else if (hours > 30) {
    alert('Wow, you have worked a lot of hours!');
}

这行不通。

可能有什么问题?我将在这里留下完整的剧本:

'use strict';

let hours = prompt('How many hours have you worked today?');

if (hours > 18) {
  alert('You have worked enough hours, thank you,');
} else if (hours < 18) {
  alert('You have not worked enough hours.');
} else if (hours > 30) {
  alert('Wow, you have worked a lot of hours!');
}

alert(`You have worked ${hours} hours`);

3 回复 | 直到 5 年前

Dcoder14 5 年前

首先,你必须检查小时数是否大于30,然后你必须检查18,因为首先如果你检查 hours > 18 然后,当您输入的小时数超过18小时(也包括大于30小时)时,它将始终为真,因此您的支票 else if (hours > 30) 从不执行。

<!DOCTYPE>
 <html>
   <script>

     'use strict';

      let hours = prompt('How many hours have you worked today?');

      if (hours > 30) {
         alert('Wow, you have worked a lot of hours!');
      }
      else if (hours >= 18) {
         alert('You have worked enough hours, thank you,');
      }
      else if (hours < 18) {
         alert('You have not worked enough hours.');
      }

     alert(`You have worked ${hours} hours`);

  </script>
</html>

Albert Nguyen 5 年前

您需要先检查条件“小时数>30”。希望下面的代码对你有所帮助

<!DOCTYPE>
<html>

<script>

    'use strict';

    let hours = prompt('How many hours have you worked today?');
    if (hours > 30) {

        alert('Wow, you have worked a lot of hours!');
    } 
    else if (hours > 18) {

        alert('You have worked enough hours, thank you,');
    }

    else if (hours < 18) {

        alert('You have not worked enough hours.');
    }

    alert(`You have worked ${hours} hours`);

    </script>

</html>

Shawn Xiao 5 年前

你应该搬走 if (hours >= 30) 一开始,先检查一下。否则,它将包含在条件中 if (hours >= 18) 永远不会被处决。

<!DOCTYPE>
<html>

<script>

    'use strict';

    let hours = prompt('How many hours have you worked today?');

    if (hours >= 30) {

        alert('Wow, you have worked a lot of hours!');
    }
    else if (hours >= 18) {

        alert('You have worked enough hours, thank you,');
    }
    else {

        alert('You have not worked enough hours.');
    }

    alert(`You have worked ${hours} hours`);

    </script>

</html>

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