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点击单选按钮改变输入框（文本域）的内容，这是一个JavaScript 的应用，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。
<html> <head> <title>点击单选框改变输入框内容JavaScript</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=ok.asp method=post > <TABLE width=560> <TR> <TD> <TABLE cellPadding=2> <TR align=left> <TD vAlign=top align=left> <INPUT onclick="showIt( 'off');return true" type=radio value=0 name=Level checked> ASP</TD> <TD align=left width=20> </TD> <TD vAlign=top align=left><INPUT onclick="showIt( 'low');return true" type=radio value=25 name=Level> PHP</TD> <TD align=left width=20> </TD> <TD vAlign=top align=left> <INPUT onclick="showIt( 'high');return true" type=radio value=75 name=Level> JSP</TD> <TD align=left width=20> </TD> <TD vAlign=top align=left><INPUT onclick="showIt( 'excl');return true" type=radio value=100 name=Level> AJAX</TD> </TR></TABLE></TD></TR></TABLE> <table cellspacing=1 cellpadding=0 width=562 border="0" bgcolor="7285CF" height="240"> <tr> <td colspan=3 height="145" valign="top" bgcolor="F2F2F2"> <div id=off style="WIDTH: 560px;POSITION: absolute; HEIGHT: 230; z-index: 1; background-color: F2F2F2; layer-background-color: F2F2F2; border: 1px none #000000"> <table cellspacing=5 cellpadding=2 width="560" border="0"> <tr> <td width="560">ASP是一种微软发明的WEB动态编程语言。</td> </tr> </table> </div> <div id=low style="WIDTH: 560px;POSITION: absolute; HEIGHT: 230; z-index: 2; visibility: hidden; background-color: F2F2F2; layer-background-color: F2F2F2; border: 1px none #000000"> <table cellspacing=5 cellpadding=2 width="560"> <tr > <td width="1237">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 style="WIDTH: 560px;POSITION: absolute; HEIGHT: 230; z-index: 1; visibility: hidden; background-color: F2F2F2; layer-background-color: F2F2F2; border: 1px none #000000"> <table cellspacing=5 cellpadding=2 width="560"> <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 style="WIDTH: 560px;POSITION: absolute; HEIGHT: 230; z-index: 1; visibility: hidden; background-color: F2F2F2; layer-background-color: F2F2F2; border: 1px none #000000"> <table cellspacing=5 cellpadding=2 width="560"> <tr> <td width="953">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 height="30"> <INPUT class=bottom type=submit value=" 确定 "> <INPUT class=bottom type=button value=" 取消 " name="Button"> </TD></TR></TABLE> </FORM> </body> </html>