ajax的封装
function getParam(obj){ "use strict"; let str=""; for(var k in obj){ str+=k+"="+obj[k]+"&"; } return str.substring(0,str.length-1); } function createXHR(){ if(window.XMLHttpRequest){ return new XMLHttpRequest(); } return new ActiveXObject("Msxml2.XMLHTTP"); } function Ajax(opts){ opts.type=opts.type==undefined ? "get":opts.type; opts.async=opts.async==undefined ? true:opts.async; opts.dataType=opts.dateType==undefined ? "json":opts.dataType; let xhr=createXHR(); if(opts.type=="get"){ xhr.open("get",opts.url+"?"+getParam(opts.data),opts.async); xhr.send(null); }else{ xhr.open("post",opts.url,opts.async); xhr.setRequestHeader('Content-Type','application/x-www-form-urlencodeed'); xhr.send(getParam(opts.data)); } if(opts.async){ xhr.onreadystatechange=function(){ if(xhr.readyState==4){ result(); } } }else{ result(); } } function result(){ if(xhr.status===200){ if(opts.dataType=="json"){ opts.success(JSON.parse(xhr.responseText)); }else{ opts.success(xhr.responseText); } } }