javascript代码在ie8里报错 document.getElementById(...) 为空或不是对象的

2024-05-06 14:12:37

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ie8中对于声明文档类型更加严格如下面的代码。

运行环境： <input type='text' name='os' value='Windows平台' style='width:100px' />  <input name="ostmp" type="radio" value="" onclick="osdo('')" />清空 <input name="ostmp" type="radio" value="Windows平台" onclick="osdo('Windows平台')" /> Windows平台 <input name="ostmp" type="radio" value="" onclick="osdo('S60v2')" />S60v2 <input name="ostmp" type="radio" value="" onclick="osdo('S60v3')" />S60v3 <input name="ostmp" type="radio" value="" onclick="osdo('CHM')" />CHM <input name="ostmp" type="radio" value="" onclick="osdo('PDF')" />PDF <input name="ostmp" type="radio" value="" onclick="osdo('PPT')" />PPT <input name="ostmp" type="radio" value="" onclick="osdo('DOC')" />WORD <input name="ostmp" type="radio" value="" onclick="osdo('EXCEL')" />EXCEL <input name="ostmp" type="radio" value="" onclick="osdo('asp')" />asp <input name="ostmp" type="radio" value="" onclick="osdo('asp+access')" />asp+access <input name="ostmp" type="radio" value="" onclick="osdo('asp+sqlserver')" />asp+sqlserver <input name="ostmp" type="radio" value="" onclick="osdo('asp+sql/access')" /> asp+sql/access php源码 <input name="ostmp" type="radio" value="" onclick="osdo('php')" />php <input name="ostmp" type="radio" value="" onclick="osdo('php+mysql')" /> php+mysql<input name="ostmp" type="radio" value="" onclick="osdo('jsp')" />jsp asp.net源码 <input name="ostmp" type="radio" value="" onclick="osdo('asp.net')" />asp.net <input name="ostmp" type="radio" value="" onclick="osdo('asp.net+access')" />asp.net+access <input name="ostmp" type="radio" value="" onclick="osdo('asp.net+sql')" />asp.net+sql <input name="ostmp" type="radio" value="" onclick="osdo('asp.net+sql/access')" />asp.net+sql/access

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]
可以看到这段代码在ie7与ie8中都是可以运行的，下面的代码我们加入声明文档
代码如下:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

加了上面的文档类型声明。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 运行环境： <input type='text' name='os' value='Windows平台' style='width:100px' />  <input name="ostmp" type="radio" value="" onclick="osdo('')" />清空 <input name="ostmp" type="radio" value="Windows平台" onclick="osdo('Windows平台')" /> Windows平台 <input name="ostmp" type="radio" value="" onclick="osdo('S60v2')" />S60v2 <input name="ostmp" type="radio" value="" onclick="osdo('S60v3')" />S60v3 <input name="ostmp" type="radio" value="" onclick="osdo('CHM')" />CHM             </SPAN>
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<p align="center" class="pageLink"></p>
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<script>
		  function CheckPl(obj)
		  {
		  if(obj.saytext.value=="")
		  {
		  alert("您没什么话要说吗？");
		  obj.saytext.focus();
		  return false;
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		  </script><form action="/e/pl/doaction.php" method="post" name="saypl" id="saypl" onsubmit="return CheckPl(document.saypl)">
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