1.在项目的根目录下创建data目录，data目录下创建info文件,编写info文件如下代码:
<h1>all data<h2>
<p>this is the data of the p sign</p>
2.在index.html文件中编写如何代码:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta lang="zh">
<script src="js/jquery-3.3.1.js">
</script>
<script>
$(document).ready(function(){
$("#btn1").click(function(){
$('#test').load('data/info',function (responseTxt,statusTxt,xhr) {
if(statusTxt == "success")
alert("内容加载成功！");
if(statusTxt == "error")
alert("Error: "+xhr.status+": "+xhr.statusText);
});
});
$("#btn2").click(function () {
$("#test").load('data/info p',function (responseTxt,statusTxt,xhr) {
if(statusTxt == "success")
alert("内容加载成功！");
if(statusTxt == "error")
alert("Error: "+xhr.status+": "+xhr.statusText);
})
});
})
</script>
</head>
<body>
<h3 id="test">请点击下面的按钮，通过 jQuery AJAX 改变这段文本。</h3>
<button id="btn1" type="button">获取全部内容</button>
<button id="btn2" type="button">获取p标签内容</button>
</body>
</html>