Question

这是一个小问题，我开始学习JavaScript，目前正在测试其他if语句以及“提示”操作。但是此操作不会在此处执行，因为我无法给“鸡肉”赋予值

我到底做错了什么？

<html>
<head></head>
<body>
<script>
function state(){
 var chicken = promt("insert value");
 var alive = 1;
 var dead = 2;

 if (chicken == alive)
 {
  document.write("Chicken is Alive");
 }
 else if 
 {
  document.write("Chicken is Dead");
 }
}

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

Answer 1

在下面的代码中添加了一些注释，希望对您有所帮助！

<html>
  <head></head>
  <body>
    <script>
      function state(){
        var chicken = prompt("insert value");
        var alive = 1;
        var dead = 2;

        //compare string to number? this chicken will never be alive! 
    //What if user types "maybe", we would compare 'maybe' == 1 //false

     if (chicken == alive)
        {
          document.write("Chicken is Alive");
        }
        // you will always kill the chicken! you missed condition
        else if (alive < 3)
        {
          document.write("Chicken is Dead");
        }
      }

      //remember to call the function!
      state()
    </script>
  </body>
</html>

Answer 2

您没有在定义状态函数后调用它。除了markymarks答案外，在页面加载完成后加载用户javascript也是一个好习惯。

<body onload="myFunction()">

JavaScript`promt`不会在脚本开头执行

2 个答案: