标签：function const 网络 xhr AJAX result 超时
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>请求超时与网络异常</title>
<style>
#result{
width:200px;
height:100px;
border:solid 1px #90b;
}
</style>
</head>
<body>
<button>点击发送请求</button>
<div id="result"></div>
<script>
const btn = document.getElementsByTagName('button')[0];
const result = document.querySelector('#result');
btn.addEventListener('click', function(){
const xhr = new XMLHttpRequest();
//超时设置 2s 设置
xhr.timeout = 2000;
//超时回调
xhr.ontimeout = function(){
alert("网络异常, 请稍后重试!!");
}
//网络异常回调
xhr.onerror = function(){
alert("你的网络似乎出了一些问题!");
}
xhr.open("GET",'http://127.0.0.1:8000/delay');
xhr.send();
xhr.onreadystatechange = function(){
if(xhr.readyState === 4){
if(xhr.status >= 200 && xhr.status< 300){
result.innerHTML = xhr.response;
}
}
}
})
</script>
</body>
</html>
标签：function,
const,
网络,
xhr,
AJAX,
result,
超时
From： https://www.cnblogs.com/chuixulvcao/p/17070464.html