Question

这段代码有问题，但我无法弄清楚它是什么。页面无法正常工作或执行其应有的操作。我需要一个提示输入密码并将尝试限制为3的代码。在第三次尝试之后，它需要有一个警告框。我还没有添加警报框后面的内容。

<script>
var attempts = 3;
var answer = prompt("Password: ");
while (attempts != 0) 
{
    if (answer == "Psycho")
    {
        document.write("These are pictures of my kitten and     her things.");
    }
    else
    {
        answer = prompt("Password: ");
        attempts--;
    }
}
if (attempts = 0) 
{
    alert("Incorrect Password");
}
</script>

Answer 1

有几个选项可以修复您的代码。一旦你完成了工作，你就可以回来。

<script>
var attempts = 3;
var answer = prompt("Password: ");
while (attempts != 0) 
{
    if (answer == "Psycho")
    {
        document.write("These are pictures of my kitten and     her things.");
        return;
    }
    else
    {
        answer = prompt("Password: ");
        attempts--;
    }
}
if (attempts == 0) 
{
    alert("Incorrect Password");
}
</script>

或者，如果你失败了，我会早点回来

<script>
var attempts = 4;
var answer = prompt("Password: ");
while (attempts > 0 && answer != "Psycho") 
{
    answer = prompt("Password: ");
    attempts--;
}

if (attempts == 0) 
{
    alert("Incorrect Password");
}
else
{
    document.write("These are pictures of my kitten and     her things.");
}
</script>

Answer 2

你有几个问题。您应该在用户输入提示后检查条目。或者不会检查最后一个条目。下一个问题是你没有退出循环。另一个问题是=是如此分配的事实，如果你分配零，而不是检查它是否为零。

＆＃13;

var attempts = 3;
while (attempts > 0) {
  var answer = prompt("Password: ");
  if (answer == "Psycho") {
    document.write("These are pictures of my kitten and her things.");
    break;
  }
  attempts--;
}
if (attempts == 0) {
  alert("Incorrect Password");
}

＆＃13;

Javascript Prompt Box Loops

2 个答案: