Question

我正在做一个课程课程，这需要一个制作程序，询问学生每天要学习多少小时，但是我无法获得提示命令在这些JavaScript系列中工作：< / p>

<html>
<body>
<script>

var studiedhours = prompt("How many hours do you study a day?");

if (studiedhours <= 0) { alert{"Sorry, you must enter a number between 0 and 24"}
}
    else if (studiedhours >= 5) {
    alert("Well Done! \n Keep it up!")
}
    else if (studiedhours >= 24) {
    alert("Sorry, there is only 24 hours in a day, you entered an invalid number")
}
else {
    alert("You should study more!")
}

</script>
</body>
</html>

什么阻止提示命令工作？

Answer 1

您的代码中存在语法错误。

在这一行中使用括号，而不是大括号。

 alert{"Sorry, you must enter a number between 0 and 24"}

到

 alert("Sorry, you must enter a number between 0 and 24")

希望这会有所帮助。

JavaScript Prompt命令在HTML中不起作用

1 个答案: