我正在学习 Beginning Javascript,但无法通过第 2 章完成练习 2。练习是纠正这段代码
<!DOCTYPE html>
<html lang="en">
<head>
<title>Chapter 2, Finishing exercise 2</title>
</head>
<body>
<script>
var firstNumber = prompt("Enter the first number", "");
var secondNumber = prompt("Enter the second number", "");
var theTotal = firstNumber + secondNumber;
document.write(firstNumber + " added to " + secondNumber + " equals " theTotal);
</script>
</body>
</html>
我可以使用警报来显示正确的总数,但是当我删除评论时,它不再起作用。
<!DOCTYPE html>
<html lang="en">
<head>
<title>Chapter 2, Finishing exercise 2</title>
</head>
<body>
<script>
var firstNumber = prompt("Enter the first number", "");
var secondNumber = prompt("Enter the second number", "");
var intFirstNumber = parseInt(firstNumber, 10);
var intSecondNumber = parseInt(secondNumber, 10);
var theTotal = intFirstNumber + intSecondNumber;
alert(theTotal);
//document.write (intFirstNumber + " added to " + intSecondNumber + " equals " theTotal);
</script>
</body>
</html>
我不知道我的 document.write 语句有什么问题。有什么提示吗?此外,是否有更优雅的方式来实现我正在做的事情?
最佳答案
您需要在 "equals"
和 theTotal
之间再添加一个 +
:
document.write(firstNumber + " added to " + secondNumber + " equals " + theTotal);
在此上下文中,+
符号表示将其后面的任何内容连接(追加)到其之前的任何内容。
进一步阅读:
关于javascript - Javascript入门第2章完成练习2,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/30281458/