html脚本标记

Question

为什么这不起作用

<script src="jquery.js"/>

但这很有效

<script src="jquery.js"></script>

？

Firefox 3.5.8

Answer 1

因为:

<script src="jquery.js"/>

是有效的XML(包括XHTML),但不是有效的HTML.

见18.2.1 SCRIPT元素:

18.2.1 SCRIPT元素

<!ELEMENT SCRIPT - - %Script;          -- script statements -->
<!ATTLIST SCRIPT
  charset     %Charset;      #IMPLIED  -- char encoding of linked resource --
  type        %ContentType;  #REQUIRED -- content type of script language --
  src         %URI;          #IMPLIED  -- URI for an external script --
  defer       (defer)        #IMPLIED  -- UA may defer execution of script --
  >

开始标记:必需,结束标记:必需