后端发出请求，前端进行接收（AJAX）
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style>
#result {
width: 300px;
height: 100px;
border: 1px solid red;
}
</style>
</head>
<body>
<div id="result"></div>
</body>
<script type="text/javascript">
//获取元素
const result = document.getElementById('result');
//绑定键盘按下事件
window.onkeydown = function(){
//发送请求
const xhr = new XMLHttpRequest();
//设置响应体数据类型
xhr.responseType = 'json';
//初始化
xhr.open('GET','http://127.0.0.1:8000/json-server');
//发送
xhr.send();
//事件绑定1
xhr.onreadystatechange = function() {
if(xhr.readyState === 4) {
if(xhr.status >= 200 && xhr.status < 300){
//手动获取数据
// let data = JSON.parse(xhr.response);
// console.log(data)
// result.innerHTML = data.name;
//自动获取数据 使用方法:xhr.responseType = 'json';
console.log(xhr.response)
let data = xhr.response
result.innerHTML = data.name;
}
}
}
}
</script>
</html>
