function tovalidate(){
var first = document.getElementById("first");
var second = document.getElementById("second");
if(first.value=="1"){
first.style.backgroundColor="red";
//first.style.backgroundImage="";图
}
if(second.value=="2"){
second.style.backgroundColor="blue";
}
}页面
输入1： <input type="text" id="first" />
输入2： <input type="text" id="second" />
<input type="button" value="test" onclick="tovalidate()" />
var first = document.getElementById("first");
var second = document.getElementById("second");
if(first.value=="1"){
first.style.backgroundColor="red";
//first.style.backgroundImage="";图
}
if(second.value=="2"){
second.style.backgroundColor="blue";
}
}页面
输入1： <input type="text" id="first" />
输入2： <input type="text" id="second" />
<input type="button" value="test" onclick="tovalidate()" />
<input type=hidden id="hidInf" value=0>
<table border="1" width="100%" id=myTab>
<tr>
<td> </td>
<td> </td>
</tr>
<tr>
<td> </td>
<td> </td>
</tr>
</table>
<script language="javascript">
<!--
function $(id){return document.getElementById(id)}
$("myTab").style.backgroundImage="url("+($("hidInf").value==1?"http://s.vdoing.com/icon/vd02.gif":"http://www.csdn.net/ui/images/gongshang_logos.gif")+")"
//-->
</script>
<body onload="tovalidate()">