Ajax发送和接收二进制字节流数据的方法发送和接收二进制字节流数据的方法
主要介绍了Ajax发送和接收二进制字节流数据的方法，非常不错，具有参考借鉴价值，感兴趣的朋友一起看看
吧
HTML5 Ajax 2.0标准中，增强了Ajax的许多功能，包括发送FormData数据，上传数据进度条等诸多功能。但实际上，Ajax可
以字节发送二进制数据。
发送二进制数据发送二进制数据
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);
接收二进制数据接收二进制数据
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);
当然，如上设置只能是文本类型，如果是Blob类型，那么如下即可
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();
如果你使用的是旧版本的浏览器，那么加载二进制可以如下
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;
}
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