fetch获取http的response响应码
DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>状态码测试title>
head>
<body>
body>
<script>
fetch('www.baidu.com').then(function(response) {
if(response.status == 200){
alert(response.status);
}
}).catch(function(e) {
alert("error");
});
script>
html>
各个状态码的参考：http://tools.jb51.net/table/http_status_code
之后学习一下fetch的相关知识
fetch相关网站
Fetch API: https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch
W3C: https://www.w3cschool.cn/fetch_api/fetch_api-w7mt2jzc.html
xhr: https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest#Constructor
W3C xhr: https://www.w3cschool.cn/ajax/ajax-xmlhttprequest-send.html