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js控制input框只讀實現示例

 控制input框只讀可以防止用戶對數據的更改,在某些情況下還是比較實用的,下面使用js來完成這個只讀實現

代碼如下: <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="只讀" value="read" onclick="isreadonly();">  <input type="button" name="可寫" value="write" onclick="readwrite();">  </form>  </body>  </html>  <!--  點擊“read”按鈕,input框不能書寫,且變灰;點擊“write”按鈕,input框恢復。  -->   
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