大文件下载插件webupload插件

一、此方法火狐有些版本是不支持的

window.location.href = ‘https://*****.oss-cn-**.aliyuncs.com/*********’;

二、为了解决火狐有些版本不支持,可以改成这种方式

window.location=’https://*****.oss-cn-**.aliyuncs.com/*********’;

三、该方法IE和火狐都可以,url表示要下载的文件路径:

function(url) {

    try {

        var elemIF = document.createElement(“iframe”);

        elemIF.src = url;

        elemIF.style.display = “none”;

        document.body.appendChild(elemIF);

    } catch(e) {

        alert(“下载异常!”);

    }

}

 

四、form表单的形式

downloadFile(url) {

    var form = $(“<form>”);

    form.attr(“style”, “display:none”);

    form.attr(“target”, “”);

    form.attr(“method”, “get”);

    form.attr(“action”, url);

    $(“body”).append(form);

    form.submit(); //表单提交}

}

 

五、a标签的方式

function(url, name) {

    var a = document.createElement(“a”);

    a.download = name + “.xls”;

    a.href = url;

    $(“body”).append(a); // 修复firefox中无法触发click

    a.click();

    $(a).remove();

}

 

六、假如后台给的文件流

function(formData, url, name) {

    return new Promise((resolve, reject) = >{

        var xhr = new XMLHttpRequest();

        xhr.open(“POST”, url, true); // 也可以使用POST方式,根据接口

        xhr.responseType = “blob”; // 返回类型blob

        // 定义请求完成的处理函数,请求前也可以增加加载框/禁用下载按钮逻辑

        xhr.onload = function() {

            // 请求完成

            if (this.status === 200) {

                // 返回200

                var blob = this.response;

                var reader = new FileReader();

                reader.readAsDataURL(blob); // 转换为base64,可以直接放入a表情href

                reader.onload = function(e) {

                    // 转换完成,创建一个a标签用于下载

                    var a = document.createElement(“a”);

                    a.download = name + “.xls”;

                    a.href = e.target.result;

                    $(“body”).append(a); // 修复firefox中无法触发click

                    a.click();

                    resolve(200)

                    $(a).remove();

                };

            }

        };

        // 发送ajax请求

        xhr.send(formData);

    })

};

 

七、download.js

我粘贴一下download的源码

//download.js v4.2, by dandavis; 2008-2016. [CCBY2] see http://danml.com/download.html for tests/usage

// v1 landed a FF+Chrome compat way of downloading strings to local un-named files, upgraded to use a hidden frame and optional mime

// v2 added named files via a[download], msSaveBlob, IE (10+) support, and window.URL support for larger+faster saves than dataURLs

// v3 added dataURL and Blob Input, bind-toggle arity, and legacy dataURL fallback was improved with force-download mime and base64 support. 3.1 improved safari handling.

// v4 adds AMD/UMD, commonJS, and plain browser support

// v4.1 adds url download capability via solo URL argument (same domain/CORS only)

// v4.2 adds semantic variable names, long (over 2MB) dataURL support, and hidden by default temp anchors

// https://github.com/rndme/download

(function(root, factory) {

    if (typeof define === ‘function’ && define.amd) {

        // AMD. Register as an anonymous module.

        define([], factory);

    } else if (typeof exports === ‘object’) {

        // Node. Does not work with strict CommonJS, but

        // only CommonJS-like environments that support module.exports,

        // like Node.

        module.exports = factory();

    } else {

        // Browser globals (root is window)

        root.download = factory();

    }

} (this,function() {

    return function download(data, strFileName, strMimeType) {

        var self = window,

        // this script is only for browsers anyway…

        defaultMime = “application/octet-stream”,

        // this default mime also triggers iframe downloads

        mimeType = strMimeType || defaultMime,

        payload = data,

        url = !strFileName && !strMimeType && payload,

        anchor = document.createElement(“a”),

        toString = function(a) {

            return String(a);

        },

        myBlob = (self.Blob || self.MozBlob || self.WebKitBlob || toString),

        fileName = strFileName || “download”,

        blob,

        reader;

        myBlob = myBlob.call ? myBlob.bind(self) : Blob;

        if (String(this) === “true”) { //reverse arguments, allowing download.bind(true, “text/xml”, “export.xml”) to act as a callback

            payload = [payload, mimeType];

            mimeType = payload[0];

            payload = payload[1];

        }

        if (url && url.length < 2048) { // if no filename and no mime, assume a url was passed as the only argument

            fileName = url.split(“/”).pop().split(“?”)[0];

            anchor.href = url; // assign href prop to temp anchor

            if (anchor.href.indexOf(url) !== -1) { // if the browser determines that it’s a potentially valid url path:

                var ajax = new XMLHttpRequest();

                ajax.open(“GET”, url, true);

                ajax.responseType = ‘blob’;

                ajax.onload = function(e) {

                    download(e.target.response, fileName, defaultMime);

                };

                setTimeout(function() {

                    ajax.send();

                },

                0); // allows setting custom ajax headers using the return:

                return ajax;

            } // end if valid url?

        } // end if url?

        //go ahead and download dataURLs right away

        if (/^data\:[\w+\-]+\/[\w+\-]+[,;]/.test(payload)) {

            if (payload.length > (1024 * 1024 * 1.999) && myBlob !== toString) {

                payload = dataUrlToBlob(payload);

                mimeType = payload.type || defaultMime;

            } else {

                return navigator.msSaveBlob ? // IE10 can’t do a[download], only Blobs:

                navigator.msSaveBlob(dataUrlToBlob(payload), fileName) :

                saver(payload); // everyone else can save dataURLs un-processed

            }

        } //end if dataURL passed?

        blob = payload instanceof myBlob ?

        payload:

        new myBlob([payload], {type: mimeType});

        function dataUrlToBlob(strUrl) {

            var parts = strUrl.split(/[:;,]/),

            type = parts[1],

            decoder = parts[2] == “base64” ? atob: decodeURIComponent,

            binData = decoder(parts.pop()),

            mx = binData.length,

            i = 0,

            uiArr = new Uint8Array(mx);

            for (i; i < mx; ++i) uiArr[i] = binData.charCodeAt(i);

            return new myBlob([uiArr], {

                type: type

            });

        }

 

        function saver(url, winMode) {

            if (‘download’ in anchor) { //html5 A[download]

                anchor.href = url;

                anchor.setAttribute(“download”, fileName);

                anchor.className = “download-js-link”;

                anchor.innerHTML = “downloading…”;

                anchor.style.display = “none”;

                document.body.appendChild(anchor);

                setTimeout(function() {

                    anchor.click();

                    document.body.removeChild(anchor);

                    if (winMode === true) {

                        setTimeout(function() {

                            self.URL.revokeObjectURL(anchor.href);

                        },

                        250);

                    }

                },

                66);

                return true;

            }

 

            // handle non-a[download] safari as best we can:

            if (/(Version)\/(\d+)\.(\d+)(?:\.(\d+))?.*Safari\//.test(navigator.userAgent)) {

                url = url.replace(/^data:([\w\/\-\+]+)/, defaultMime);

                if (!window.open(url)) { // popup blocked, offer direct download:

                    if (confirm(“Displaying New Document\n\nUse Save As… to download, then click back to return to this page.”)) {

                        location.href = url;

                    }

                }

                return true;

            }

            //do iframe dataURL download (old ch+FF):

            var f = document.createElement(“iframe”);

            document.body.appendChild(f);

            if (!winMode) { // force a mime that will download:

                url = “data:” + url.replace(/^data:([\w\/\-\+]+)/, defaultMime);

            }

            f.src = url;

            setTimeout(function() {

                document.body.removeChild(f);

            },

            333);

        } //end saver

        if (navigator.msSaveBlob) { // IE10+ : (has Blob, but not a[download] or URL)

            return navigator.msSaveBlob(blob, fileName);

        }

        if (self.URL) { // simple fast and modern way using Blob and URL:

            saver(self.URL.createObjectURL(blob), true);

        } else {

            // handle non-Blob()+non-URL browsers:

            if (typeof blob === “string” || blob.constructor === toString) {

                try {

                    return saver(“data:” + mimeType + “;base64,” + self.btoa(blob));

                } catch(y) {

                    return saver(“data:” + mimeType + “,” + encodeURIComponent(blob));

                }

            }

            // Blob but not URL support:

            reader = new FileReader();

            reader.onload = function(e) {

                saver(this.result);

            };

            reader.readAsDataURL(blob);

        }

        return true;

    };

    /* end download() */

}));

用法:

download(fileUrl,name,”video/mp4″);

具体更多的用法请参考官网,

注意 download.js第一个参数 是数据流,不是像oss那样的文件地址

详细的配置信息可以参考我写的这篇文章:http://blog.ncmem.com/wordpress/2019/08/28/java%e6%89%b9%e9%87%8f%e4%b8%8b%e8%bd%bd/