Jquery无须浏览实现直接下载文件

通常GET方式：后面带明文参数，不安全。

window.location.href = 'http://localhost:1188/FileDownload.aspx?token=SCBC#’;

1、通过XMLHttpRequest+HTML5 Blob对象

jQuery.download_XMLHttpRequest = function (url, fn, data, method) { // 获得url和data
    var xhr = new XMLHttpRequest();
    xhr.open(method, url, true);//get请求，请求地址，是否异步
    xhr.responseType = "blob";    // 返回类型blob
    xhr.onload = function () {// 请求完成处理函数
        if (this.status === 200) {
            var blob = this.response;// 获取返回值
            if (navigator.msSaveBlob) // IE10 can't do a[download], only Blobs:
            {
                window.navigator.msSaveBlob(blob, fn);
                return;
            }

            if (window.URL) { // simple fast and modern way using Blob and URL:        
                var a = document.createElement('a');
                var oURL = window.URL.createObjectURL(blob);
                if ('download' in a) { //html5 A[download]             
                    a.href = oURL;
                    a.setAttribute("download", fn);
                    a.innerHTML = "downloading...";
                    document.body.appendChild(a);
                    setTimeout(function () {
                        a.click();
                        document.body.removeChild(a);
                        setTimeout(function () {
                            window.URL.revokeObjectURL(a.href);
                        }, 250);
                    }, 66);
                    return;
                }

                //do iframe dataURL download (old ch+FF):
                var f = document.createElement("iframe");
                document.body.appendChild(f);

                oURL = "data:" + oURL.replace(/^data:([\w\/\-\+]+)/, "application/octet-stream");

                f.src = oURL;
                setTimeout(function () {
                    document.body.removeChild(f);
                }, 333);

            }
        }
    };

    var form = new FormData();
    jQuery.each(data.split('&'), function () {
        var pair = this.split('=');
        form.append(pair[0], pair[1]);
    });

    // 发送ajax请求
    xhr.send(form);

};

2、通过构建Form表单提交

jQuery.download_Form = function (url, data, method) { // 获得url和data
    if (url && data) {
        // data 是 string 或者 array/object
        data = typeof data == 'string' ? data : jQuery.param(data); // 把参数组装成 form的 input
        var inputs = '';
        jQuery.each(data.split('&'), function () {
            var pair = this.split('=');
            inputs += '<input type="hidden" name="' + pair[0] + '" value="' + pair[1] + '" />';
        }); // request发送请求
        jQuery('<form action="' + url + '" method="' + (method || 'post') + '">' + inputs + '</form>').appendTo('body').submit().remove();
    };
};

形如：

var url = 'http://localhost:1188/MouldFileDownload.aspx';
// 构造隐藏的form表单
var $form = $("<form id='download' class='hidden' method='post'></form>");
$form.attr("action", url);
$(document.body).append($form);
// 添加提交参数
var $input1 = $("<input name='token'  type='hidden'></input>");
$input1.attr("value", "SCBCSAPMould2019~!@#");
$("#download").append($input1);

// 提交表单
$form.submit();

3、调用：

$.download_XMLHttpRequest('http://localhost:1188/FileDownload.aspx', 'data.jpg', "token=SCBC#", 'post');

$.download_Form('http://localhost:1188/FileDownload.aspx', "token=SCBCS#", 'post');