这里实现点击单选按钮改变输入框中文本域内容的方法，是一个JavaScript 的简单应用，可以减少用户的输入，提升用户操作易用性，它类似一个TAB选项卡一样的功能，并可以完成后提交表单，值得学习。
运行效果截图如下：
具体代码如下：
<html> <head> <title>JavaScript点击单选框改变输入框内容</title> </head> <body> <script language=JavaScript> var defaultValue = "" function Changes() { var defaultValue = "changed"; } ie = document.all?1:0 ns4 = document.layers?1:0 var c = 1 function hideIt(id) { if (ie) { document.all[id].style.zIndex = c--; document.all[id].style.visibility = "hidden"; document.all['hider'].style.visibility = "visible"; } else if (ns4) { document.layers[cat].layers[id].zIndex = c--; document.layers[cat].layers[id].visibility = "hide"; document.layers[cat].layers['hider'].visibility = "show"; } } function showIt(id) { if (ie) { document.all[id].style.zIndex = c++; document.all[id].style.visibility = "visible"; } else if (ns4) { document.layers[cat].layers[id].zIndex = c++; document.layers[cat].layers[id].visibility = "show"; } else { document.getElementById(id).style.zIndex = c++; document.getElementById(id).style.visibility = "visible"; } } function imgLbl(tab) { premier = frmWc.elements[tab - 1]; if (premier.checked == 1) { premier.checked = 0; } else { premier.checked = 1; } } </script> <FORM name=protectForm action="" method=post > <TABLE width=560> <TR> <TD> <TABLE cellPadding=2> <TR align=left> <TD vAlign=top align=left> <INPUT type=radio value=0 name=Level checked> ASP</TD> <TD align=left width=20> </TD> <TD vAlign=top align=left><INPUT type=radio value=25 name=Level> PHP</TD> <TD align=left width=20> </TD> <TD vAlign=top align=left> <INPUT type=radio value=75 name=Level> JSP</TD> <TD align=left width=20> </TD> <TD vAlign=top align=left><INPUT type=radio value=100 name=Level> AJAX</TD> </TR></TABLE></TD></TR></TABLE> <table cellspacing=1 cellpadding=0 width=562 bgcolor="7285CF"> <tr> <td colspan=3 valign="top" bgcolor="F2F2F2"> <div id=off> <table cellspacing=5 cellpadding=2> <tr> <td>ASP是一种微软发明的WEB动态编程语言。</td> </tr> </table> </div> <div id=low> <table cellspacing=5 cellpadding=2> <tr > <td>PHP是一种开源、免费平台通用型WEB编程语言。</td> </tr> </table> </div> <div id=high> <table cellspacing=5 cellpadding=2> <tr>JSP是SUN公司制造的基于JAVA的WEB编程容器，也是一种WEB编程语言。</td> </tr> </table> </div> <div id=excl> <table cellspacing=5 cellpadding=2> <tr> <td>AJAX是一种WEB交互型框架语言，可以很好的提升用户体验。</td> </tr> </table> </div> </td> </tr> </table> <TABLE cellSpacing=0 cellPadding=0 width=560> <TR> <TD align=right> <INPUT class=bottom type=submit value=" 确定 "> <INPUT class=bottom type=button value=" 取消 "> </TD></TR></TABLE> </FORM> </body> </html>