HTML5 Ajax 2.0標准中,增強了Ajax的許多功能,包括發送FormData數據,上傳數據進度條等諸多功能。但實際上,Ajax可以字節發送二進制數據。
發送二進制數據
var oReq = new XMLHttpRequest(); oReq.open("POST", url, true); oReq.onload = function (oEvent) { // Uploaded. }; var blob = new Blob(['abc123'], {type: 'text/plain'}); oReq.send(blob);
或者
var myArray = new ArrayBuffer(512); var longInt8View = new Uint8Array(myArray); for (var i=0; i< longInt8View.length; i++) { longInt8View[i] = i % 255; } var xhr = new XMLHttpRequest; xhr.open("POST", url, false); xhr.send(myArray);
接收二進制數據
var oReq = new XMLHttpRequest(); oReq.open("GET", "/myfile.png", true); oReq.responseType = "arraybuffer"; oReq.onload = function (oEvent) { var arrayBuffer = oReq.response; // Note: not oReq.responseText if (arrayBuffer) { var byteArray = new Uint8Array(arrayBuffer); for (var i = 0; i < byteArray.byteLength; i++) { } } }; oReq.send(null);
當然,如上設置只能是文本類型,如果是Blob類型,那麼如下即可
var oReq = new XMLHttpRequest(); oReq.open("GET", "/myfile.png", true); oReq.responseType = "arraybuffer"; oReq.onload = function(oEvent) { var blob = new Blob([oReq.response], {type: "image/png"}); // ... }; oReq.send();
或者
var oReq = new XMLHttpRequest(); oReq.open("GET", "/myfile.png", true); oReq.responseType = "blob"; oReq.onload = function(oEvent) { var blob = oReq.response; // ... }; oReq.send();
如果你使用的是舊版本的浏覽器,那麼加載二進制可以如下
function load_binary_resource(url) { var req = new XMLHttpRequest(); req.open('GET', url, false); //XHR binary charset opt by Marcus Granado 2006 [http://mgran.blogspot.com] req.overrideMimeType('text\/plain; charset=x-user-defined'); req.send(null); if (req.status != 200) return ''; return req.responseText; }
注意:x-user-defined告訴浏覽器不要解析數據
以上所述是小編給大家介紹的Win7任務欄Ajax發送和接收二進制字節流數據的方法的相關知識,希望對大家有所幫助,如果大家有任何疑問請給我留言,小編會及時回復大家的。在此也非常感謝大家對網站的支持!