前端之家收集整理的这篇文章主要介绍了
Ajax状态，
前端之家小编觉得挺不错的，现在分享给大家，也给大家做个参考。
var xhr = new XMLHttpRequest();
xhr.open("GET","http://localhost:8080",true);
xhr.onreadystatechange = function(){
switch(this.readyState){
case 0:
console.log('request has not been initialized');
break;
case 1:
console.log('server connection established');
break;
case 2:
console.log('request received');
break;
case 3:
console.log('processing request');
break;
case 4:
console.log('request finished and response is ready');
console.log(this.responseText)
break;
}
}
xhr.send();
