<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>自动分配最优线路</title> <meta name="viewport" content="width=device-width,initial-scale=1"> <style type="text/css"> #loadingwrapper .loading-mask{background:#080915;position:fixed;z-index:1000;top:0;right:0;left:0;bottom:0;} #loadingwrapper .loading-box-s{position:absolute;top:50%;left:50%;z-index:5000;text-align:center;width:100%;transform:translate(-50%, -50%);background:#080915;border-radius:5px; } #loadingwrapper .loader-cicle{position:relative;width:50px;height:50px;margin-top:15px;margin-bottom:15px;border-radius:50%;display:inline-block;vertical-align:middle;border:7px double #bd5837;-webkit-animation:ball-turn 1s linear infinite;animation:ball-turn 1s linear infinite;} #loadingwrapper .loading-text{color: #c3c3c3;} #loadingwrapper .loader-cicle::before{content: "";position:absolute;width:10px;height:10px;background:#bd5837;border-radius:50%;bottom:0;right:30px;} #loadingwrapper .loader-cicle::after{content: "";position:absolute;width:10px;height:10px;background:#bd5837;border-radius:50%;left:30px;top:0;} @keyframes ball-turn{0%{-webkit-transform:rotate(0deg);transform:rotate(0deg);}100%{-webkit-transform:rotate(360deg);transform:rotate(360deg);}} </style> </head> <body> <div id="loadingwrapper"> <div class="loading-mask"></div> <div class="loading-box-s"> <div class="loader-cicle"></div> <p class="loading-text">正在为您选择最佳线路，请稍后.....</p> </div> </div> <script type="text/javascript"> let ips = [ '192.168.12.1', '192.168.12.2', '192.168.12.3', '192.168.12.4', '192.168.12.5', ];//线路地址 let source = 'http://b-ssl.duitang.com/uploads/item/201705/04/20170504162335_msfSV.jpeg';//静态请求资源 let arr = []; for(let ip of ips){ arr.push( new Promise(function(resolve, reject) { let startTime, endTime, fileSize; let xhr = new XMLHttpRequest(); xhr.onreadystatechange = () => { if(xhr.readyState === 2){ startTime = Date.now(); } if (xhr.readyState === 4 && xhr.status === 200) { endTime = Date.now(); fileSize = xhr.responseText.length; setTimeout(resolve, endTime-startTime, ip); } } xhr.open("GET", source, true); xhr.send(); }) ); } Promise.race(arr).then(function(value) { console.log(value); location.href= value; //跳转最优线路 }); </script> </body> </html>