Question

我正在学习并搞乱内置的Chrome控制台。请原谅我的结构。我可以问这些初学者问题吗？

我无法使用两种变体：

如果我对学习JavaScript不感兴趣，请输入“不”。响应，我想要一个新的提示，以显示分配newInterest变量，然后继续提醒＆＃39;这很棒＆＃39;。

＆＃13;

var interestLevel = prompt('Hello, are you interested in learning JavaScript?')
if (interestLevel == "yes") {
  alert('Wonderful, welcome!')
}
if (interestLevel == "no") {
  var newInterest = prompt('Then what are you interested in?')
}

＆＃13;

第二个应该在“是”之后结束。响应，但它实际上继续询问第二个提示，不应该是这种情况。

＆＃13;

var interestLevel = prompt('Hello, are you interested in learning JavaScript?')
if (interestLevel == "yes") {
  alert('Wonderful, welcome!')
}
if (interestlevel == "no") {
  alert('That sucks')
}
/* press ok to make the box go away so that the next prompt below will show up */
var newInterest = prompt('Then what are you interested in?')

＆＃13;

编辑：我根据每个人的建议修改了所有内容。我的下一个目标是找出如何使下面的功能。

var interestLevel = prompt('Hello, are you interested in learning JavaScript?')
if (interestLevel == "yes") {
  alert('Wonderful, welcome!')
}
else if (interestLevel == "no") {
  alert('That sucks')
  /* press ok to make the box go away so that the next prompt below will show up */
  var newInterest = prompt('Then what are you interested in? html? css?')
if (newInterest === "html"){alert('let\'s get started with html!')}
else if (newInterest === "css"){alert('I don\'t know css')
}
    else {alert('please input css or html')}
}

Answer 1

仅在此人回复否时提示。

var interestLevel = prompt('Hello, are you interested in learning JavaScript?')
if (interestLevel == "yes") {
  alert('Wonderful, welcome!')
}
if (interestlevel == "no") {
  alert('That sucks')
}
/* press ok to make the box go away so that the next prompt below will show up*/
if(interestLevel == "no")
    var newInterest = prompt('Then what are you interested in?')

或者这也可以，取决于您希望如何组织代码。

var interestLevel = prompt('Hello, are you interested in learning JavaScript?')
if (interestLevel == "yes") {
  alert('Wonderful, welcome!')
}
if (interestlevel == "no") {
  alert('That sucks');
  var newInterest = prompt('Then what are you interested in?')
}
/*press ok to make the box go away so that the next prompt below will show up */

Answer 2

这里有两个问题：

如果第一个答案为＆＃34; no，＆＃34;则仅显示第二个提示（newInterest）。将其移至if (interestlevel == "no")代码块。
您的变量大小写并不总是匹配。上述interestlevel声明中的if应更改为interestLevel。

见这个例子：

＆＃13;

var interestLevel = prompt('Hello, are you interested in learning JavaScript?')
if (interestLevel == "yes") {
  alert('Wonderful, welcome!')
}
if (interestLevel == "no") {
  alert('That sucks')
  /* press ok to make the box go away so that the next prompt below will show up */
  var newInterest = prompt('Then what are you interested in?')
}

＆＃13;

这里并不重要，但是对于较大的脚本，您可以使用if语句替换第二个else if语句，该语句只有在第一个if时才会运行}语句返回false。这样，如果第一个条件是true，则第二个if语句根本不会被检查（因为它的结果不重要）并且可能会节省几纳秒。

<强>更新

如果要将此代码转换为函数，请将其包装在函数语句中，如下所示：

function myFunction() {
  var interestLevel = prompt('Hello, are you interested in learning JavaScript?')
  if (interestLevel == "yes") {
    alert('Wonderful, welcome!')
  }
  if (interestLevel == "no") {
    alert('That sucks')
      /* press ok to make the box go away so that the next prompt below will show up */
    var newInterest = prompt('Then what are you interested in?')
  }
}

然后调用它，就像这样：

myFunction();

在事件

2 个答案: