和get类似，稍作改动：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>AJAX POST 请求</title>
<style>
#result {
width: 200px;
height: 100px;
border: solid 1px #903;
}
</style>
</head>
<body>
<div id="result"></div>
<script>
const result = document.getElementById("result");
result.addEventListener("mouseover", function () {
const xhr = new XMLHttpRequest();
xhr.open('POST', 'http://127.0.0.1:8000/server');
xhr.send();
xhr.onreadystatechange = function () {
if (xhr.readyState === 4) {
if (xhr.status >= 200 && xhr.status < 300) {
result.innerHTML = xhr.response;
}
}
}
})
</script>
</body>
</html>server文件里加上
app.post('/server', (request, response) => {
//设置响应头
response.setHeader('Access-Control-Allow-Origin', '*');
//设置响应体
response.send('HELLO AJAX POST');
});如图：
即可到网页端查看效果
