<html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><title>新建网页 1</title></head><body><input id=i></body>
<script language="javascript">
<!--
i.onchange = function(){
i.onchange if(i.old == i.value){ alert('not change') }else{ i.old = i.value alert('changed')
}}i.value = 'abc'i.onchange()i.value = 'abc'i.onchange()i.value = 'def'i.onchange()function Value(v){ if(this.old == v){ alert('not change') }else{ this.old = this.value this.value = v this.onchange() }}i.Value = Valuei.Value('abc')i.Value('abc')i.Value('def')
//--></script></html>