FileSaver(html5)

来自 https://github.com/eligrey/FileSaver.js
此脚本不应直接安装，它是一个供其他脚本使用的外部库。如果您需要使用该库，请在脚本元属性加入：// @require https://update.cn-greasyfork.org/scripts/405376/816426/FileSaver%28html5%29.js
提问、发表评价，或者举报这个脚本。
换行
// ==UserScript==
// @name         FileSaver(html5)
// @namespace    https://github.com/eligrey/FileSaver.js
// @version      2.0.2
// @description  来自 https://github.com/eligrey/FileSaver.js
// ==/UserScript==
(function (global, factory) {
    if (typeof define === "function" && define.amd) {
        define([], factory);
    } else if (typeof exports !== "undefined") {
        factory();
    } else {
        var mod = {
            exports: {}
        };
        factory();
        global.FileSaver = mod.exports;
    }
})(this, function () {
    "use strict";
 
    /*
    * FileSaver.js
    * A saveAs() FileSaver implementation.
    *
    * By Eli Grey, http://eligrey.com
    *
    * License : https://github.com/eligrey/FileSaver.js/blob/master/LICENSE.md (MIT)
    * source  : http://purl.eligrey.com/github/FileSaver.js
    */
    // The one and only way of getting global scope in all environments
    // https://stackoverflow.com/q/3277182/1008999
    var _global = typeof window === 'object' && window.window === window ? window : typeof self === 'object' && self.self === self ? self : typeof global === 'object' && global.global === global ? global : void 0;
 
    function bom(blob, opts) {
        if (typeof opts === 'undefined') opts = {
            autoBom: false
        };else if (typeof opts !== 'object') {
            console.warn('Deprecated: Expected third argument to be a object');
            opts = {
                autoBom: !opts
            };
        } // prepend BOM for UTF-8 XML and text/* types (including HTML)
        // note: your browser will automatically convert UTF-16 U+FEFF to EF BB BF
 
        if (opts.autoBom && /^\s*(?:text\/\S*|application\/xml|\S*\/\S*\+xml)\s*;.*charset\s*=\s*utf-8/i.test(blob.type)) {
            return new Blob([String.fromCharCode(0xFEFF), blob], {
                type: blob.type
            });
        }
 
        return blob;
    }
 
    function download(url, name, opts) {
        var xhr = new XMLHttpRequest();
        xhr.open('GET', url);
        xhr.responseType = 'blob';
 
        xhr.onload = function () {
            saveAs(xhr.response, name, opts);
        };
 
        xhr.onerror = function () {
            console.error('could not download file');
        };
 
        xhr.send();
    }
 
    function corsEnabled(url) {
        var xhr = new XMLHttpRequest(); // use sync to avoid popup blocker
 
        xhr.open('HEAD', url, false);
 
        try {
            xhr.send();
        } catch (e) {}
 
        return xhr.status >= 200 && xhr.status <= 299;
    } // `a.click()` doesn't work for all browsers (#465)
 
 
    function click(node) {
        try {
            node.dispatchEvent(new MouseEvent('click'));
        } catch (e) {
            var evt = document.createEvent('MouseEvents');
            evt.initMouseEvent('click', true, true, window, 0, 0, 0, 80, 20, false, false, false, false, 0, null);
            node.dispatchEvent(evt);
        }
    }
 
    var saveAs = _global.saveAs || ( // probably in some web worker
        typeof window !== 'object' || window !== _global ? function saveAs() {}
            /* noop */
            // Use download attribute first if possible (#193 Lumia mobile)
            : 'download' in HTMLAnchorElement.prototype ? function saveAs(blob, name, opts) {
                var URL = _global.URL || _global.webkitURL;
                var a = document.createElement('a');
                name = name || blob.name || 'download';
                a.download = name;
                a.rel = 'noopener'; // tabnabbing
                // TODO: detect chrome extensions & packaged apps
                // a.target = '_blank'
 
                if (typeof blob === 'string') {
                    // Support regular links
                    a.href = blob;
 
                    if (a.origin !== location.origin) {
                        corsEnabled(a.href) ? download(blob, name, opts) : click(a, a.target = '_blank');
                    } else {
                        click(a);
                    }
                } else {
                    // Support blobs
                    a.href = URL.createObjectURL(blob);
                    setTimeout(function () {
                        URL.revokeObjectURL(a.href);
                    }, 4E4); // 40s
 
                    setTimeout(function () {
                        click(a);
                    }, 0);
                }
            } // Use msSaveOrOpenBlob as a second approach
            : 'msSaveOrOpenBlob' in navigator ? function saveAs(blob, name, opts) {
                    name = name || blob.name || 'download';
 
                    if (typeof blob === 'string') {
                        if (corsEnabled(blob)) {
                            download(blob, name, opts);
                        } else {
                            var a = document.createElement('a');
                            a.href = blob;
                            a.target = '_blank';
                            setTimeout(function () {
                                click(a);
                            });
                        }
                    } else {
                        navigator.msSaveOrOpenBlob(bom(blob, opts), name);
                    }
                } // Fallback to using FileReader and a popup
                : function saveAs(blob, name, opts, popup) {
                    // Open a popup immediately do go around popup blocker
                    // Mostly only available on user interaction and the fileReader is async so...
                    popup = popup || open('', '_blank');
 
                    if (popup) {
                        popup.document.title = popup.document.body.innerText = 'downloading...';
                    }
 
                    if (typeof blob === 'string') return download(blob, name, opts);
                    var force = blob.type === 'application/octet-stream';
 
                    var isSafari = /constructor/i.test(_global.HTMLElement) || _global.safari;
 
                    var isChromeIOS = /CriOS\/[\d]+/.test(navigator.userAgent);
 
                    if ((isChromeIOS || force && isSafari) && typeof FileReader === 'object') {
                        // Safari doesn't allow downloading of blob URLs
                        var reader = new FileReader();
 
                        reader.onloadend = function () {
                            var url = reader.result;
                            url = isChromeIOS ? url : url.replace(/^data:[^;]*;/, 'data:attachment/file;');
                            if (popup) popup.location.href = url;else location = url;
                            popup = null; // reverse-tabnabbing #460
                        };
 
                        reader.readAsDataURL(blob);
                    } else {
                        var URL = _global.URL || _global.webkitURL;
                        var url = URL.createObjectURL(blob);
                        if (popup) popup.location = url;else location.href = url;
                        popup = null; // reverse-tabnabbing #460
 
                        setTimeout(function () {
                            URL.revokeObjectURL(url);
                        }, 4E4); // 40s
                    }
                });
    _global.saveAs = saveAs.saveAs = saveAs;
 
    if (typeof module !== 'undefined') {
        module.exports = saveAs;
    }
});