首先，您需要发出一个设置头文件的ajax请求。然后，您需要使用一些HTML5
API将接收到的二进制数据转换为base64。最后，使用
data:协议和base64数据设置映像src 。
var oReq = new XMLHttpRequest();oReq.open("GET", "yourpage.jsp", true);oReq.setRequestHeader("Your-Header-Here", "Value");// use multiple setRequestHeader calls to set multiple valuesoReq.responseType = "arraybuffer";oReq.onload = function (oEvent) { var arrayBuffer = oReq.response; // Note: not oReq.responseText if (arrayBuffer) { var u8 = new Uint8Array(arrayBuffer); var b64enpred = btoa(String.fromCharCode.apply(null, u8)); var mimetype="image/png"; // or whatever your image mime type is document.getElementById("yourimageidhere").+mimetype+";base64,"+b64enpred; }};oReq.send(null);资料来源：
https://developer.mozilla.org/zh-
CN/docs/Web/API/XMLHttpRequest/Sending_and_Receiving_Binary_Data
