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

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

出处:互联网 整理: 软晨网（RuanChen.com） 发布: 2010-01-10 浏览: 572 ::

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javascript &&和||运算法的另类使用技巧 js鼠标移动在title中显示图片的效果代码

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 全选提示:你可先修改部分代码,再按运行]

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 全选提示:你可先修改部分代码,再按运行]

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:

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 全选提示:你可先修改部分代码,再按运行]

javascript &&和||运算法的另类使用技巧 js鼠标移动在title中显示图片的效果代码

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

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