安排不好程序，要求给输入框内容赋值时触发事件
可以用onpropertychange来实现的。
<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(){
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 = Value
i.Value('abc')
i.Value('abc')
i.Value('def')
//-->
</script>
</html>
没
<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>