用JS实现input输入框里的只读属性_is input 只读-优快云博客

本文链接：https://blog.youkuaiyun.com/chunyong66/article/details/78022434

大家好！今天我再写程序时，见到了用js如何使input里的输入框产生只读属性。特意搜索一些资料，网上说的很多，我见到了一个特别的，而且简单，给大家分享一下。
欢迎大家转发，版权归作者所有，转载请注明出处

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <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.removeAttribute("readOnly");

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="只读" value="read" onclick="isreadonly();">

  <input type="button" name="可写" value="write" onclick="readwrite();">

  </form>

 </body>

</html>