<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Ajax</title> <script> $(function(){ $('btn').onclick = function(){ //创建ajax对象 //ie6以下：new ActiveXObject('Microsoft.XMLHTTP'); var xhr = null; try{ xhr = new XMLHttpRequest(); }catch (e){ xhr = new ActiveXObject('Microsoft.XMLHTTP'); } //发送方式 xhr.open('post','1.txt',true); //接受 xhr.send(); //触发 xhr.onreadystatechange = function(){ console.log( this ); //判断状态 if (xhr.readyState == 4) { alert( xhr.responseURL ); } } } }) function $(v){ if (typeof v === 'function') { window.onload = v; }else if (typeof v === 'string') { return document.getElementById(v); }else if (typeof v === 'object') { return v } } </script> </head> <body> <input type='button' value='按钮' id='btn'/> </body> </html>