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。
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="/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>
点击只读按钮输入框就会变色，并且只读不写，再点击可写按钮就会撤销只读属性，变得可写，并且颜色也变回来了。
