var URL = window.URL || window.webkitURL;

function saveAs(blob, filename) {

    var type = blob.type;

    var force_saveable_type = 'application/octet-stream';

    if (type && type != force_saveable_type) { // 强制下载，而非在浏览器中打开

        var slice = blob.slice || blob.webkitSlice || blob.mozSlice;

        blob = slice.call(blob, 0, blob.size, force_saveable_type);

    }

    var url = URL.createObjectURL(blob);

    var save_link = document.createElementNS('http://www.w3.org/1999/xhtml', 'a');

    save_link.href = url;

    save_link.download = filename;

​

    var event = new MouseEvent("click", {

            bubbles: true,

            cancelable: true,

            view: window

        });

    save_link.dispatchEvent(event);

    URL.revokeObjectURL(url);

}

​

​

​

var oReq = new XMLHttpRequest();

// The Endpoint of your server 

var URLToPDF = "https://mozilla.github.io/pdf.js/web/compressed.tracemonkey-pldi-09.pdf";

​

// Configure XMLHttpRequest

oReq.open("GET", URLToPDF, true);

​

// Important to use the blob response type

oReq.responseType = "blob";

// When the file request finishes

// Is up to you, the configuration for error events etc.

oReq.onload = function() {

    // Once the file is downloaded, open a new window with the PDF

    // Remember to allow the POP-UPS in your browser

    var file = new Blob([oReq.response], { 

        type: 'application/pdf' 

    });

    // Generate file download directly in the browser !

    saveAs(file,'mypdffilename.pdf');

};

​

oReq.send();