复制代码代码如下:
<html>
<Evista>
<title> nuevo documento </title>
<meta name = "generador" content = "editplus">
<meta name = "autor" content = "">
<meta name = "Keywords" content = "">
<meta name = "descripción" content = "">
</ablo>
<script language = "javaScript">
función isreadonly () {
var obj = document.getElementById ("nombre de usuario");
obj.SetAttribute ("Readonly", verdadero);
obj.style.backgroundcolor = "#d2d2d2";
}
function readWrite () {
var obj = document.getElementById ("nombre de usuario");
obj.SetAttribute ("Readonly", falso);
obj.style.backgroundcolor = "#ffffff";
}
</script>
<Body>
<form de nombre = "addform" id = "addform" método = "post" action = "">
<input type = "text" id = "username" name = "username">
<input type = "button" name = "只读" value = "read" onClick = "isReadonly ();">
<input type = "button" name = "可写" value = "write" onClick = "readWrite ();">
</form>
</body>
</html>
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点击 “Leer” 按钮 ， Entrada 框不能书写 且变灰；点击 且变灰；点击 “Escribir” 按钮 按钮 框恢复。 框恢复。
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