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</LI></UL></DIV> <DIV id=maincontent> <H1>HTML 5 <script> 标签</H1> <DIV> <H2>定义和用法</H2> <P><script> 标签定义一段脚本，比如 JavaScript。</P> <P>如果 async 属性为 true，则脚本会相对于文档的其余部分异步执行，这样脚本会可以在页面继续解析的过程中来执行。</P> <P>如果 async 属性为 false，而 defer 属性为 true，则脚本会在页面完成解析时得到执行。</P> <P>如果 async 和 defer 属性均为 false，那么脚本会立即执行，页面会在脚本执行完毕继续解析。</P></DIV> <DIV> <H2>HTML 4.01 与 HTML 5 之间的差异</H2> <P>在 HTML 5 中，有一些新属性，同时不再支持 HTML 4.01 中的一些属性。</P></DIV> <DIV> <H2>提示和注释</H2> <P class=tip><SPAN>提示：</SPAN>如果存在 src 属性，则 <script> 标签必须是空的。</P></DIV> <DIV> <H2>例子</H2><PRE><CODE><script type="text/javascript"></CODE> document.write("Hello World!") <CODE></script></CODE> </PRE></DIV> <DIV> <H2>属性</H2> <TABLE class=dataintable> <TBODY> <TR> <TH>属性</TH> <TH>值</TH> <TH>描述</TH> <TH>4</TH> <TH>5</TH></TR> <TR> <TD>async</TD> <TD> <UL> <LI>true <LI>false </LI></UL></TD> <TD>定义脚本是否异步执行。</TD> <TD> </TD> <TD>5</TD></TR> <TR> <TD>type</TD> <TD> <UL> <LI>text/ecmascript <LI>text/javascript <LI>application/ecmascript <LI>application/javascript <LI>text/vbscript </LI></UL></TD> <TD>指示脚本的 MIME 类型。</TD> <TD>4</TD> <TD>5</TD></TR> <TR> <TD>charset</TD> <TD>charset</TD> <TD>定义脚本中使用的字符编码。不支持。</TD> <TD>4</TD> <TD> </TD></TR> <TR> <TD>defer</TD> <TD> <UL> <LI>true <LI>false </LI></UL></TD> <TD>指示脚本不会�成任何的文档内容。浏览器可以继续解析并绘制页面。</TD> <TD>4</TD> <TD>5</TD></TR> <TR> <TD>language</TD> <TD> <UL> <LI>javascript <LI>livescript <LI>vbscript <LI><I>other</I> </LI></UL></TD> <TD>规定脚本语言。不赞成使用。请使用 type 属性代替它。</TD> <TD>4</TD> <TD> </TD></TR> <TR> <TD>src</TD> <TD>URL</TD> <TD>定义指向包含脚本的文件的 URL（这样您就可以引用某个包含脚本的文件，而不是直接把脚本插入您的 HTML 文档中）。</TD> <TD>4</TD> <TD>5</TD></TR></TBODY></TABLE> <H3>标准属性</H3><PRE>class, contenteditable, contextmenu, dir, draggable, id, irrelevant, lang, ref, registrationmark, tabindex, template, title</PRE> <P>如需完整的描述，请访问 <A href="html5_ref_standardattributes.htm">HTML 5 中标准属性</A>。</P> <H3>事件属性</H3><PRE>onabort, onbeforeunload, onblur, onchange, onclick, oncontextmenu, ondblclick, ondrag, ondragend, ondragenter, ondragleave, ondragover, ondragstart, ondrop, onerror, onfocus, onkeydown, onkeypress, onkeyup, onload, onmessage, onmousedown, onmousemove, onmouseover, onmouseout, onmouseup, onmousewheel, onresize, onscroll, onselect, onsubmit, onunload </PRE> <P>如需完整的描述，请访问 <A href="html5_ref_eventattributes.htm">HTML 5 中事件属性</A>。</P></DIV> <DIV class=example> <H2>TIY 实例</H2> <DL> <DT><A href="/tiy/t.htm?f=html_script">插入一段脚本</A> <DD>本例演示如何将脚本插入 HTML 文档。 <DT><A href="/tiy/t.htm?f=html_noscript">运行于不支持脚本的浏览器</A> <DD>本例演示如何对付不支持脚本的浏览器。 </DD></DL></DIV></DIV> <DIV id=sidebar> <DIV id=searchui> <FORM id=searchform method=get action=http://www.google.cn/search> <P><LABEL for=searched_content>Search:</LABEL></P> <P><INPUT value=www.w3school.com.cn type=hidden name=sitesearch></P> <P><INPUT id=searched_content class=box title=在此输入搜索内容。 name=as_q> <INPUT class=button title=搜索！ value=Go type=submit> </P></FORM></DIV> </DIV> <DIV id=footer> 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