javascript代碼在ie8里報(bào)錯(cuò) document.getElementById(...) 為空或不是對(duì)象的

2024-05-06 14:12:37

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ie8中對(duì)于聲明文檔類型更加嚴(yán)格如下面的代碼。

運(yùn)行環(huán)境： <input type='text' name='os' value='Windows平臺(tái)' style='width:100px' />  <input name="ostmp" type="radio" value="" onclick="osdo('')" />清空 <input name="ostmp" type="radio" value="Windows平臺(tái)" onclick="osdo('Windows平臺(tái)')" /> Windows平臺(tái) <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源碼 <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源碼 <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 全選注:如需引入外部Js需刷新才能執(zhí)行]
可以看到這段代碼在ie7與ie8中都是可以運(yùn)行的，下面的代碼我們加入聲明文檔
代碼如下:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

加了上面的文檔類型聲明。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 運(yùn)行環(huán)境： <input type='text' name='os' value='Windows平臺(tái)' style='width:100px' />  <input name="ostmp" type="radio" value="" onclick="osdo('')" />清空 <input name="ostmp" type="radio" value="Windows平臺(tái)" onclick="osdo('Windows平臺(tái)')" /> Windows平臺(tái) <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>
</div>
</div>
<div   id="iwvjtn8m0"   class=page1>
<p align="center" class="pageLink"></p>
</div>

<div   id="iwvjtn8m0"   class="fenxiang">

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<script src=/d/js/acmsd/gao21.js></script>

</div>

<div   id="iwvjtn8m0"   class="pinglun">

<script>
		  function CheckPl(obj)
		  {
		  if(obj.saytext.value=="")
		  {
		  alert("您沒什么話要說嗎？");
		  obj.saytext.focus();
		  return false;
		  }
		  return true;
		  }
		  </script><form action="/e/pl/doaction.php" method="post" name="saypl" id="saypl" onsubmit="return CheckPl(document.saypl)">
<table width="100%" border="0" cellpadding="0" cellspacing="0" id="plpost">

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