jquery下载PDF

URLToPDF 是PDF的路径地址。
theFileName 是 PDF路径上的名字，当然也可以自定义。

    var URLToPDF = "";
    var theFileName = URLToPDF.substring(URLToPDF.lastIndexOf('/') + 1, URLToPDF.length);
    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) {
            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);
    }
    $('#downloads').on('click', function (){
        var oReq = new XMLHttpRequest();

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

        oReq.responseType = "blob";
        oReq.onload = function() {
            var file = new Blob([oReq.response], { 
                type: 'application/pdf' 
            });
            saveAs(file, theFileName);
        };
        oReq.send();
    })