HTML5 Javascript SWITCH不在头部或身体上运行

Question

I have a simple code written in JS and embedded in the html5 document. 我有一个用JS编写并嵌入html5文档的简单代码。 Cannot get this thing to run no matter where I place the script part (head or body). 无论我将脚本部件（头部或身体）放在何处，都无法运行此程序。 I have enabled all content in my browsers but none of them runs the script. 我已经在浏览器中启用了所有内容，但是没有一个运行脚本。

Any ideas where the issue could be? 有什么想法可以解决这个问题吗？

<!DOCTYPE html>
<html>
   <title>tryme</title>
   <head>
   </head>
   <body>
      <script>
        var instr = prompt("which instrument do you play?");
        switch(instr) {
            case "violin":
            case "piano":
                alert("Me too!");
                break;
            case "drums":
            case "ukulele":
                alert("sonds good");
                break;
            case "whistle":
                alert("omg!!!");
                break;
            default:    
                alert("whatever...");
        }
      </script>
      <noscript>"your browser doesnt support javascript"</noscript>
   </body>
</html>

Answer 1

Your semi-colon looking characters ( ; ) are actually showing up as the unicode : 分号字符（ ; ）实际上显示为unicode ：

U+037E : GREEK QUESTION MARK U + 037E：希腊问号

Rather than the correct semi-colons ( ; ): 而不是正确的分号（ ; ）：

U+003B : SEMICOLON U + 003B：SEMICOLON

With the "wrong semi-colon", you see this error in the browser developer console (usually press F12 to open): 使用“错误的分号”，您会在浏览器开发人员控制台中看到此错误（通常按F12键打开）：

Uncaught SyntaxError: Unexpected token ILLEGAL Uncaught SyntaxError：意外的令牌非法

JavaScript supports unicode directly in source files, so you have to be very careful about which characters are used in the source. JavaScript直接在源文件中支持unicode，因此您必须非常小心源中使用了哪些字符。

Answer 2

Your problem here is that your ";" 您的问题是您的“;” semicolons have the wrong encoding. 分号的编码错误。

Answer 3

This is sample example as like your code. 这是示例示例，就像您的代码一样。 It working fine. 工作正常。

  <!DOCTYPE html> <html> <title>tryme</title> <head> </head> <body> <script type="text/javascript"> var instr = prompt("which instrument do you play?"); switch(instr){ case "2": case "1":alert('hello'); break; case "dd": case "tt":alert('hello tt'); break; default:alert("no any"); } </script> <noscript>"your browser doesnt support javascript"</noscript> </body> </html>

HTML5 Javascript SWITCH不在头部或身体上运行

问题描述

3 个解决方案

解决方案1
4 已采纳 2016-01-27 14:59:42

解决方案2
2 2016-01-27 14:59:18

解决方案3
-1 2016-01-27 15:12:07

HTML5 Javascript SWITCH不在头部或身体上运行

问题描述

3 个解决方案

解决方案1 4 已采纳 2016-01-27 14:59:42

解决方案2 2 2016-01-27 14:59:18

解决方案3 -1 2016-01-27 15:12:07

解决方案1
4 已采纳 2016-01-27 14:59:42

解决方案2
2 2016-01-27 14:59:18

解决方案3
-1 2016-01-27 15:12:07