function ajax(a,b,c,d,e){c=void 0===c?null:c,d=void 0===d?"GET":d,e=void 0===e?!0:e;var f;f=window.XMLHttpRequest?new XMLHttpRequest:new ActiveXObject("Microsoft.XMLHTTP"),f.onreadystatechange=function(){4==f.readyState&&200==f.status&&b(f.responseText)},f.open(d,a,e),"POST"==d&&f.setRequestHeader("Content-type","application/x-www-form-urlencoded"),f.send(c)}
1. ajax(网址,回调函数,post的数据,post/get方式,是否异步默认为是); ajax(url,check,data,"POST"); 2. ajax(网址,回调函数);post默认为get ajax(url,callback)
