使用jQuery AJAX下载二进制文件

只需直接使用XHR。这个例子取自MDN：

var oReq = new XMLHttpRequest();oReq.open("GET", "/myfile.png", true);oReq.responseType = "arraybuffer";oReq.onload = function(oEvent) {  var arrayBuffer = oReq.response;  // if you want to access the bytes:  var byteArray = new Uint8Array(arrayBuffer);  // ...  // If you want to use the image in your DOM:  var blob = new Blob([arrayBuffer], {type: "image/png"});  var url = URL.createObjectURL(blob);  someImageElement.src = url;  // whatever...};oReq.send();