jQuery DOM操作文本
DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<script src="jquery-3.4.1.min.js">script>
<title>Documenttitle>
head>
<body>
<input type="text" id="myinput" name="username" value="张三"> <br>
<div id="mydiv"><p>勇敢牛牛p>div>
body>
<script>
//获取value属性
alert($("#myinput").val());
//获取标题文本
alert($("#mydiv").text());
//获取div后面所有内容
alert($("#mydiv").html());
script>
html>
实现效果