同步与异步
原生的AJAX
代码
<!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">
<title>原生Ajax</title>
</head>
<body>
<input type="button" value="获取数据" onclick="getData()">
<div id="div1"></div>
</body>
<script>
function getData(){
//1. 创建XMLHttpRequest
var xmlHttpRequest = new XMLHttpRequest();
//2. 发送异步请求
xmlHttpRequest.open('GET','http://yapi.smart-xwork.cn/mock/169327/emp/list');
xmlHttpRequest.send();//发送请求
//3. 获取服务响应数据
xmlHttpRequest.onreadystatechange = function(){
if(xmlHttpRequest.readyState == 4 && xmlHttpRequest.status == 200){
document.getElementById('div1').innerHTML = xmlHttpRequest.responseText;
}
}
}
</script>
</html>
