<html>
<head>
<title> New Document </title>
<meta name="Generator" content="EditPlus">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="">
</head>
<script language="JavaScript">
function isreadonly(){
var obj = document.getElementById("username");
obj.setAttribute("readOnly",true);
obj.style.backgroundColor="#d2d2d2";
}
function readwrite(){
var obj = document.getElementById("username");
obj.setAttribute("readOnly",false);
obj.style.backgroundColor="#ffffff";
}
</script>
<body>
<form name="addform" id="addform" method="post" action="" >
<input type="text" id="username" name="username">
<input type="button" name=" read-only " value="read" onclick="isreadonly();">
<input type="button" name=" Can write " value="write" onclick="readwrite();">
</form>
</body>
</html>
<!--
Click on the" read "Button, input The box cannot be written and is grayed. Click on the" write "Button, input Box back.
-->