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javascript代码在ie8里报错 document.getElementById(...) 为空或不是对象的解决方法原创

2009-11-28 02:08:42 作者：

今天更升级了ie8,发现原来在ie7下可以运行的代码，不能运行了，发现了一些细节，附临时修改办法。

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' />

<script type="text/javascript"> 
                function osdo(str){ 
                document.getElementById("os").value=str; 
                } 
                </script> 
<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 <strong>php源码</strong> 
<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 <strong>asp.net源码</strong> 
<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

复制代码代码如下:

<!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' />

<script type="text/javascript"> 
                function osdo(str){ 
                document.getElementById("os").value=str; 
                } 
                </script> 
<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 <strong>php源码</strong> 
<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 <strong>asp.net源码</strong> 
<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]

发现提示document.getElementById(...) 为空或不是对象的解决方法
如果页面中既有文档声明，因为用div+css布局的时候，声不声明文档，页面的一些地方都不一样。
可以在head中添加下面的代码

复制代码代码如下:

<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" />

完整的代码

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" /> 
运行环境： 
<input type='text' name='os' value='Windows平台' style='width:100px' />

<script type="text/javascript"> 
                function osdo(str){ 
                document.getElementById("os").value=str; 
                } 
                </script> 
<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 <strong>php源码</strong> 
<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 <strong>asp.net源码</strong> 
<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]

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