JS代码在ie8里报错document.getElementById(...)为空或不是对象的解决方法
程序员文章站
2022-05-16 16:08:16
...
ie8中对于声明文档类型更加严格如下面的代码。
<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
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
<!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
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
<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