ajax接收二进制文件并转化成int,string等

//二进制Ajax请求 ???????????var xmlhttpbinary; ???????????//获得请求url的参数 ???????????function GetRequest() { ???????????????????//向服务器发送异步请求 ???????????????????xmlhttpbinary = null; ???????????????????if (window.XMLHttpRequest) {// code for IE7, Firefox, Opera, etc. ???????????????????????xmlhttpbinary = new XMLHttpRequest(); ???????????????????} ???????????????????else if (window.ActiveXObject) {// code for IE6, IE5 ???????????????????????xmlhttpbinary = new ActiveXObject("Microsoft.XMLHTTP"); ???????????????????} ???????????????????if (xmlhttpbinary != null) { ???????????????????????xmlhttpbinary.responseType = "blob"; //这里要用blob ???????????????????????xmlhttpbinary.onreadystatechange = blobxpr_state_Change; ???????????????????????xmlhttpbinary.open("GET", "test3.txt", true); ???????????????????????xmlhttpbinary.send(null); ???????????????????} ???????????????????else { ???????????????????????alert("Your browser does not support XMLHTTP."); ???????????????????} ???????????}

function blobxpr_state_Change() { ???????????if (xmlhttpbinary.readyState == 4) {// 4 = "loaded" ???????????????if (xmlhttpbinary.status == 200) {// 200 = "OK" ???????????????????var bigblob = xmlhttpbinary.response; ???????????????????var reader = new FileReader(); ???????????????????var smallblob; ???????????????????smallblob = bigblob.slice(0, 22); ???????????????????????????????????????reader.readAsArrayBuffer(smallblob); ???????????????????reader.onloadend = function (evt) { ????//filereader加载blob成功处理函数 ???????????????????????var buffer = evt.target.result; ???????????????????????//读取int ???????????????????????????????????????????????var dv = new DataView(buffer); ???????????????????????var a5 = dv.getInt32(0); ???????????????????????//读取string ???????????????????????var enc = new TextDecoder(); ???????????????????????var abc = enc.decode(buffer); ???????????????????????alert("获得字符串 " + abc); ???????????????????????document.getElementById("demo").innerHTML = abc; ???????????????????} ???????????????} ???????????????else { ???????????????????alert("Problem retrieving XML data:" + xmlhttpbinary.statusText); ???????????????} ???????????} ???????}