'use strict';function ajax(obj){var defaults = {type:'get',url:'#',dataType:'text',jsonp:'callback',data:{},async:true,success:function(data){console.log(data);}};for(var k in obj){defaults[k] = obj[k];}if(defaults.dataType == 'jsonp') {//調(diào)用jsonpajaxForJsonp(defaults);}else {//調(diào)用ajax jsonajaxForJson(defaults);}}//json數(shù)據(jù)格式function ajaxForJson(defaults){//1、創(chuàng)建XMLHttpRequset對(duì)象var xhr = null;if(window.XMLHttpRequest){xhr = new XMLHttpRequest();}else {xhr = new ActiveXObject("Microsoft.XMLHTTP");}var param = '';for(var key in defaults.data) {param += key + '='+ defaults.data[key] + '&';}if(param){param = param.slice(0, param.length-1);}// 處理get請(qǐng)求參數(shù)并且處理中文亂碼問(wèn)題if(defaults.type == 'get') {defaults.url += '?' + encodeURI(param);}//2、準(zhǔn)備發(fā)送（設(shè)置發(fā)送的參數(shù)）xhr.open(defaults.type,defaults.url,defaults.async);// 處理post請(qǐng)求參數(shù)并且設(shè)置請(qǐng)求頭信息（必須設(shè)置）var data = null;if(defaults.type == 'post') {data = param;//設(shè)置請(qǐng)求頭xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");}// 3、執(zhí)行發(fā)送動(dòng)作xhr.send(data);//處理同步請(qǐng)求，不會(huì)調(diào)用回調(diào)函數(shù)if(!defaults.async) {if(defaults.dataType == 'json'){return JSON.parse(xhr.responseText);}else {return xhr.responseText;}}//// 4、指定回調(diào)函數(shù)（處理服務(wù)器響應(yīng)數(shù)據(jù)）xhr.onreadystatechange = function() {if(xhr.readyState == 4){if(xhr.status == 200){var data = xhr.responseText;if(defaults.dataType == 'json'){data = JSON.parse(data);}defaults.success(data);}}}}//跨域jsonpfunction ajaxForJsonp(defaults){//cbName默認(rèn)的是回調(diào)函數(shù)名稱var cbName = 'jQuery' + ('1.12.2' + Math.random()).replace(//D/g,'') + '_' + (new Date().getTime());if(defaults.jsonpCallback) {cbName = defaults.jsonpCallback;}//這里就是回調(diào)函數(shù)，調(diào)用方式：服務(wù)器響應(yīng)內(nèi)容來(lái)調(diào)用//向window對(duì)象中添加一個(gè)方法，方法名是變量cname的值window[cbName] = function(data) {defaults.success(data);//這里success的data是實(shí)參}var param = '';for(var key in defaults.data){param += key + '=' + defaults.data[key] + '&'; }if(param){param = param.slice(0, param.length-1);param = '&' + param;}var script = document.createElement('script');script.src = defaults.url + '?' + defaults.jsonp + '=' + cbName + param;var head = document.getElementsByTagName('head')[0];head.appendChild(script);}