Question

当我尝试在计算机上将其拉出页面时，我遇到了问题。我不明白这一点。就像当您单击互联网上的文件按钮并单击打开文件时，该文件显示为空白。有人可以帮助我理解它为什么这样做。感谢。

    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
     <html xmlns="http://www.w3.org/1999/xhtml">

     <head>
     <meta http-equiv="content-type" content="text/html;charset=UTF-8" />
     <title>Week 10</title>
        <script type="text/javascript">
      / *<![CDATA[ */
      Var name;
     firstName = "Valerie";
     lastName ="Shipbaugh";
     var placeOfBirth;
     name=FirstName +"";
     name += lastName;
      placeOfBirth ="Houston";
     placeOfBirth +=",Texas";
     nameArray = name.split("");
     /*]]>*/
    </script>
     </head>
     <body>
     <script type="text/javascript">
       //<![CDATA[

     document.write("<p> My first name is : + nameArray[0]
     + "<br />");

    document.write("My last name is: "+ nameArray[1]
    + "<br />");
    */
     The brackets[] specifies alternate characters allowed in a patch pattern.
      It uses metacharacters which are special characters that define the pattern      matching rules ina  regular experession.
     */ 

   document.write("There are " + firstName.length
   + " characters in my first name" + " <br/>");
    */
    This one called the length property.
     This returns the number of characters in a string.

    */
    document.write("I was born in " + placeOfBirth + " <br/>");
    */ 
    With this string we are using concatenation operations.
      */
     document.write("<p>My initials are: " + firstName.charAt(0) +
     lastName.charAt(0) + "</p>"); 
     */ 
     The last one return the character at the specific position in a text string
    returns an empty string if the specified position is greater than the length of the string.
      */

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

所以，我的评论是在哪里解释发生了什么是在错误的地方???

Answer 1

当然它不起作用，评论块甚至都不对：

 */
 The brackets[] specifies alternate characters allowed in a patch pattern.
  It uses metacharacters which are special characters that define the pattern
  matching rules ina  regular experession.
 */

应该是：

 /*
 The brackets[] specifies alternate characters allowed in a patch pattern.
  It uses metacharacters which are special characters that define the pattern
  matching rules ina  regular experession.
 */

另外，你真的应该避免使用document.write。在某些情况下，这就是导致空白页面的原因（如果我没记错的话，在页面加载后使用它时）。

Answer 2

查看浏览器报告的错误（例如，firefox中的工具 - >错误控制台）它会点亮错误，例如您不匹配的/**/评论＆amp;来自;

的缺少结束引用字符

document.write("<p> My first name is : + nameArray[0]

此外，js区分大小写，因此其var不是Var，您应该使用它来定义所有变量，例如firstname（您偶然将其称为Firstname }）等。

Answer 3

有一种更通用的方法可以解决这个问题：

从这个文件中取出所有内容把它复制到记事本中。
放入 <html>和</html>到文件
开始将非常小的块复制到每次一个文件重新加载页面
很快你会看到一个小块导致失败，然后你可以评估小块。

Answer 4

JavaScript区分大小写 - 因此在脚本的第一部分中：

Var name;                      //var is with a lowecase "v"
firstName = "Valerie";
lastName ="Shipbaugh";
var placeOfBirth;
name=FirstName +"";            //firstName was created with a lowecase "f"

后来你有了......

document.write("<p> My first name is : + nameArray[0]
 + "<br />");

你错过了那里的引用，应该是 document.write（“

我的名字是：”+ nameArray [0] +“
”）;

最后，评论打开和关闭如下：

/* comment */

不喜欢这个

*/ error */

修复这些内容会使脚本运行。然而，它没有做我怀疑你想要的。您正在尝试split（）包含该名称的字符串，但没有什么可以拆分它。你需要在那之间添加一个空格并尝试这个：

nameArray = name.split(" ");

你可以在这里看到这个： http://jsfiddle.net/CM7fx/

Answer 5

在多个浏览器中进行测试，并确保您启用了启用了javascript的ID'建议首先

Answer 6

注释错误，变量名称区分大小写。这是一个没有注释的工作版本，你可以重新添加那些

     <head>
     <meta http-equiv="content-type" content="text/html;charset=UTF-8" />
     <title>Week 10</title>
        <script type="text/javascript">
            var name;
            var firstName = "Valerie";
            var lastName ="Shipbaugh";
            var placeOfBirth;

            name= firstName + " " + lastName;
            placeOfBirth ="Houston ,Texas";
            var nameArray = name.split(" ");
        </script>
    </head>
     <body>
     <script type="text/javascript">

        document.write("<p> My first name is : " + nameArray[0] + "<br />");

        document.write("My last name is: " + nameArray[1] + "<br />");

        document.write("There are " + firstName.length + " characters in my first name" + " <br/>");

        document.write("I was born in " + placeOfBirth + " <br/>");

        document.write("<p> My initials are: " + firstName.charAt(0) + lastName.charAt(0) + "</p>"); 
   </script>
    </body>
   </html>

有人能告诉我他们是否看到这个

6 个答案: