<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
function switchUser() {
let usernameEl = document.getElementById("username");
const beforeVal = usernameEl.getAttribute("readonly");
console.log("切换前状态：" + getStatus(beforeVal));
if (beforeVal === null) {
usernameEl.setAttribute("readonly", "readonly");
} else {
usernameEl.removeAttribute("readonly");
}
const afterVal = usernameEl.getAttribute("readonly");
console.log("切换后状态：" + getStatus(afterVal));
}
function getStatus(readonlyVal) {
if (readonlyVal === null) {
return "读写"
} else {
return "只读"
}
}
</script>
</head>
<body>
用户名：<input type="text" id="username" name="username"><br>
<button onclick="switchUser()">切换用户名readonly属性</button>
</body>
</html>
var rowNum = RBResultGrid.mulLineCount; // MulLine.js
if (BusinessType=="02" || BusinessType=="03") {
for (var i = 0; i < rowNum; i++) {
document.getElementsByName("RBResultGrid15")[i].setAttribute("disabled",true);
document.getElementsByName("RBResultGrid16")[i].setAttribute("disabled",true);
}
}else {
for (var i = 0; i < rowNum; i++) {
document.getElementsByName("RBResultGrid15")[i].removeAttribute("disabled");
document.getElementsByName("RBResultGrid16")[i].removeAttribute("disabled");
}
}
使用$("#id").attr("readonly","true"); 添加readonly属性
使用$("#id").removeAttr("readonly"); 移除该属性
【参考】https://blog.csdn.net/weixin_38405770/article/details/77847602
原文：https://www.cnblogs.com/wuzimeimei/p/15356305.html