onChange跟onpropertychange事件 _Web前端

onChange和onpropertychange事件
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>onproperychange和onChange方法</title>
<script>
function changeFunction(){
    	document.getElementById("textfield2").readOnly=true ;
	}
</script>
</head>
<body>
		<br>
		<input type="text" name="textfield" value="请输入" onpropertychange="document.getElementById('webtest').innerHTML=this.value;" />
		<div>您输入的值为：<span id="webtest">还未输入</span></div>
		<input type="text" name="textfield1" value="请输入"  onChange="changeFunction()" />
		<input type="text" id="textfield2" name="textfield2" value="默认值" />
		<br />
		<br>
</body>
</html>