导出table为Excel

/* Blob.js
 * A Blob implementation.
 * 2014-07-24
 *
 * By Eli Grey, http://eligrey.com
 * By Devin Samarin, https://github.com/dsamarin
 * License: X11/MIT
 *   See https://github.com/eligrey/Blob.js/blob/master/LICENSE.md
 */

/*global self, unescape */
/*jslint bitwise: true, regexp: true, confusion: true, es5: true, vars: true, white: true,
  plusplus: true */

/*! @source http://purl.eligrey.com/github/Blob.js/blob/master/Blob.js */

(function (view) {
    "use strict";

    view.URL = view.URL || view.webkitURL;

    if (view.Blob && view.URL) {
        try {
            new Blob;
            return;
        } catch (e) {}
    }

    // Internally we use a BlobBuilder implementation to base Blob off of
    // in order to support older browsers that only have BlobBuilder
    var BlobBuilder = view.BlobBuilder || view.WebKitBlobBuilder || view.MozBlobBuilder || (function(view) {
        var
              get_class = function(object) {
                return Object.prototype.toString.call(object).match(/^\[object\s(.*)\]$/)[1];
            }
            , FakeBlobBuilder = function BlobBuilder() {
                this.data = [];
            }
            , FakeBlob = function Blob(data, type, encoding) {
                this.data = data;
                this.size = data.length;
                this.type = type;
                this.encoding = encoding;
            }
            , FBB_proto = FakeBlobBuilder.prototype
            , FB_proto = FakeBlob.prototype
            , FileReaderSync = view.FileReaderSync
            , FileException = function(type) {
                this.code = this[this.name = type];
            }
            , file_ex_codes = (
                  "NOT_FOUND_ERR SECURITY_ERR ABORT_ERR NOT_READABLE_ERR ENCODING_ERR "
                + "NO_MODIFICATION_ALLOWED_ERR INVALID_STATE_ERR SYNTAX_ERR"
            ).split(" ")
            , file_ex_code = file_ex_codes.length
            , real_URL = view.URL || view.webkitURL || view
            , real_create_object_URL = real_URL.createObjectURL
            , real_revoke_object_URL = real_URL.revokeObjectURL
            , URL = real_URL
            , btoa = view.btoa
            , atob = view.atob

            , ArrayBuffer = view.ArrayBuffer
            , Uint8Array = view.Uint8Array

            , origin = /^[\w-]+:\/*\[?[\w\.:-]+\]?(?::[0-9]+)?/
        ;
        FakeBlob.fake = FB_proto.fake = true;
        while (file_ex_code--) {
            FileException.prototype[file_ex_codes[file_ex_code]] = file_ex_code + 1;
        }
        // Polyfill URL
        if (!real_URL.createObjectURL) {
            URL = view.URL = function(uri) {
                var
                      uri_info = document.createElementNS("http://www.w3.org/1999/xhtml", "a")
                    , uri_origin
                ;
                uri_info.href = uri;
                if (!("origin" in uri_info)) {
                    if (uri_info.protocol.toLowerCase() === "data:") {
                        uri_info.origin = null;
                    } else {
                        uri_origin = uri.match(origin);
                        uri_info.origin = uri_origin && uri_origin[1];
                    }
                }
                return uri_info;
            };
        }
        URL.createObjectURL = function(blob) {
            var
                  type = blob.type
                , data_URI_header
            ;
            if (type === null) {
                type = "application/octet-stream";
            }
            if (blob instanceof FakeBlob) {
                data_URI_header = "data:" + type;
                if (blob.encoding === "base64") {
                    return data_URI_header + ";base64," + blob.data;
                } else if (blob.encoding === "URI") {
                    return data_URI_header + "," + decodeURIComponent(blob.data);
                } if (btoa) {
                    return data_URI_header + ";base64," + btoa(blob.data);
                } else {
                    return data_URI_header + "," + encodeURIComponent(blob.data);
                }
            } else if (real_create_object_URL) {
                return real_create_object_URL.call(real_URL, blob);
            }
        };
        URL.revokeObjectURL = function(object_URL) {
            if (object_URL.substring(0, 5) !== "data:" && real_revoke_object_URL) {
                real_revoke_object_URL.call(real_URL, object_URL);
            }
        };
        FBB_proto.append = function(data/*, endings*/) {
            var bb = this.data;
            // decode data to a binary string
            if (Uint8Array && (data instanceof ArrayBuffer || data instanceof Uint8Array)) {
                var
                      str = ""
                    , buf = new Uint8Array(data)
                    , i = 0
                    , buf_len = buf.length
                ;
                for (; i < buf_len; i++) {
                    str += String.fromCharCode(buf[i]);
                }
                bb.push(str);
            } else if (get_class(data) === "Blob" || get_class(data) === "File") {
                if (FileReaderSync) {
                    var fr = new FileReaderSync;
                    bb.push(fr.readAsBinaryString(data));
                } else {
                    // async FileReader won‘t work as BlobBuilder is sync
                    throw new FileException("NOT_READABLE_ERR");
                }
            } else if (data instanceof FakeBlob) {
                if (data.encoding === "base64" && atob) {
                    bb.push(atob(data.data));
                } else if (data.encoding === "URI") {
                    bb.push(decodeURIComponent(data.data));
                } else if (data.encoding === "raw") {
                    bb.push(data.data);
                }
            } else {
                if (typeof data !== "string") {
                    data += ""; // convert unsupported types to strings
                }
                // decode UTF-16 to binary string
                bb.push(unescape(encodeURIComponent(data)));
            }
        };
        FBB_proto.getBlob = function(type) {
            if (!arguments.length) {
                type = null;
            }
            return new FakeBlob(this.data.join(""), type, "raw");
        };
        FBB_proto.toString = function() {
            return "[object BlobBuilder]";
        };
        FB_proto.slice = function(start, end, type) {
            var args = arguments.length;
            if (args < 3) {
                type = null;
            }
            return new FakeBlob(
                  this.data.slice(start, args > 1 ? end : this.data.length)
                , type
                , this.encoding
            );
        };
        FB_proto.toString = function() {
            return "[object Blob]";
        };
        FB_proto.close = function() {
            this.size = 0;
            delete this.data;
        };
        return FakeBlobBuilder;
    }(view));

    view.Blob = function(blobParts, options) {
        var type = options ? (options.type || "") : "";
        var builder = new BlobBuilder();
        if (blobParts) {
            for (var i = 0, len = blobParts.length; i < len; i++) {
                builder.append(blobParts[i]);
            }
        }
        return builder.getBlob(type);
    };
}(typeof self !== "undefined" && self || typeof window !== "undefined" && window || this.content || this));

/* FileSaver.js
 * A saveAs() FileSaver implementation.
 * 2014-08-29
 *
 * By Eli Grey, http://eligrey.com
 * License: X11/MIT
 *   See https://github.com/eligrey/FileSaver.js/blob/master/LICENSE.md
 */

/*global self */
/*jslint bitwise: true, indent: 4, laxbreak: true, laxcomma: true, smarttabs: true, plusplus: true */

/*! @source http://purl.eligrey.com/github/FileSaver.js/blob/master/FileSaver.js */

var saveAs = saveAs
  // IE 10+ (native saveAs)
  || (typeof navigator !== "undefined" &&
      navigator.msSaveOrOpenBlob && navigator.msSaveOrOpenBlob.bind(navigator))
  // Everyone else
  || (function(view) {
    "use strict";
    // IE <10 is explicitly unsupported
    if (typeof navigator !== "undefined" &&
        /MSIE [1-9]\./.test(navigator.userAgent)) {
        return;
    }
    var
          doc = view.document
          // only get URL when necessary in case Blob.js hasn‘t overridden it yet
        , get_URL = function() {
            return view.URL || view.webkitURL || view;
        }
        , save_link = doc.createElementNS("http://www.w3.org/1999/xhtml", "a")
        , can_use_save_link = "download" in save_link
        , click = function(node) {
            var event = doc.createEvent("MouseEvents");
            event.initMouseEvent(
                "click", true, false, view, 0, 0, 0, 0, 0
                , false, false, false, false, 0, null
            );
            node.dispatchEvent(event);
        }
        , webkit_req_fs = view.webkitRequestFileSystem
        , req_fs = view.requestFileSystem || webkit_req_fs || view.mozRequestFileSystem
        , throw_outside = function(ex) {
            (view.setImmediate || view.setTimeout)(function() {
                throw ex;
            }, 0);
        }
        , force_saveable_type = "application/octet-stream"
        , fs_min_size = 0
        // See https://code.google.com/p/chromium/issues/detail?id=375297#c7 for
        // the reasoning behind the timeout and revocation flow
        , arbitrary_revoke_timeout = 10
        , revoke = function(file) {
            var revoker = function() {
                if (typeof file === "string") { // file is an object URL
                    get_URL().revokeObjectURL(file);
                } else { // file is a File
                    file.remove();
                }
            };
            if (view.chrome) {
                revoker();
            } else {
                setTimeout(revoker, arbitrary_revoke_timeout);
            }
        }
        , dispatch = function(filesaver, event_types, event) {
            event_types = [].concat(event_types);
            var i = event_types.length;
            while (i--) {
                var listener = filesaver["on" + event_types[i]];
                if (typeof listener === "function") {
                    try {
                        listener.call(filesaver, event || filesaver);
                    } catch (ex) {
                        throw_outside(ex);
                    }
                }
            }
        }
        , FileSaver = function(blob, name) {
            // First try a.download, then web filesystem, then object URLs
            var
                  filesaver = this
                , type = blob.type
                , blob_changed = false
                , object_url
                , target_view
                , dispatch_all = function() {
                    dispatch(filesaver, "writestart progress write writeend".split(" "));
                }
                // on any filesys errors revert to saving with object URLs
                , fs_error = function() {
                    // don‘t create more object URLs than needed
                    if (blob_changed || !object_url) {
                        object_url = get_URL().createObjectURL(blob);
                    }
                    if (target_view) {
                        target_view.location.href = object_url;
                    } else {
                        var new_tab = view.open(object_url, "_blank");
                        if (new_tab == undefined && typeof safari !== "undefined") {
                            //Apple do not allow window.open, see http://bit.ly/1kZffRI
                            view.location.href = object_url
                        }
                    }
                    filesaver.readyState = filesaver.DONE;
                    dispatch_all();
                    revoke(object_url);
                }
                , abortable = function(func) {
                    return function() {
                        if (filesaver.readyState !== filesaver.DONE) {
                            return func.apply(this, arguments);
                        }
                    };
                }
                , create_if_not_found = {create: true, exclusive: false}
                , slice
            ;
            filesaver.readyState = filesaver.INIT;
            if (!name) {
                name = "download";
            }
            if (can_use_save_link) {
                object_url = get_URL().createObjectURL(blob);
                save_link.href = object_url;
                save_link.download = name;
                click(save_link);
                filesaver.readyState = filesaver.DONE;
                dispatch_all();
                revoke(object_url);
                return;
            }
            // Object and web filesystem URLs have a problem saving in Google Chrome when
            // viewed in a tab, so I force save with application/octet-stream
            // http://code.google.com/p/chromium/issues/detail?id=91158
            // Update: Google errantly closed 91158, I submitted it again:
            // https://code.google.com/p/chromium/issues/detail?id=389642
            if (view.chrome && type && type !== force_saveable_type) {
                slice = blob.slice || blob.webkitSlice;
                blob = slice.call(blob, 0, blob.size, force_saveable_type);
                blob_changed = true;
            }
            // Since I can‘t be sure that the guessed media type will trigger a download
            // in WebKit, I append .download to the filename.
            // https://bugs.webkit.org/show_bug.cgi?id=65440
            if (webkit_req_fs && name !== "download") {
                name += ".download";
            }
            if (type === force_saveable_type || webkit_req_fs) {
                target_view = view;
            }
            if (!req_fs) {
                fs_error();
                return;
            }
            fs_min_size += blob.size;
            req_fs(view.TEMPORARY, fs_min_size, abortable(function(fs) {
                fs.root.getDirectory("saved", create_if_not_found, abortable(function(dir) {
                    var save = function() {
                        dir.getFile(name, create_if_not_found, abortable(function(file) {
                            file.createWriter(abortable(function(writer) {
                                writer.onwriteend = function(event) {
                                    target_view.location.href = file.toURL();
                                    filesaver.readyState = filesaver.DONE;
                                    dispatch(filesaver, "writeend", event);
                                    revoke(file);
                                };
                                writer.onerror = function() {
                                    var error = writer.error;
                                    if (error.code !== error.ABORT_ERR) {
                                        fs_error();
                                    }
                                };
                                "writestart progress write abort".split(" ").forEach(function(event) {
                                    writer["on" + event] = filesaver["on" + event];
                                });
                                writer.write(blob);
                                filesaver.abort = function() {
                                    writer.abort();
                                    filesaver.readyState = filesaver.DONE;
                                };
                                filesaver.readyState = filesaver.WRITING;
                            }), fs_error);
                        }), fs_error);
                    };
                    dir.getFile(name, {create: false}, abortable(function(file) {
                        // delete file if it already exists
                        file.remove();
                        save();
                    }), abortable(function(ex) {
                        if (ex.code === ex.NOT_FOUND_ERR) {
                            save();
                        } else {
                            fs_error();
                        }
                    }));
                }), fs_error);
            }), fs_error);
        }
        , FS_proto = FileSaver.prototype
        , saveAs = function(blob, name) {
            return new FileSaver(blob, name);
        }
    ;
    FS_proto.abort = function() {
        var filesaver = this;
        filesaver.readyState = filesaver.DONE;
        dispatch(filesaver, "abort");
    };
    FS_proto.readyState = FS_proto.INIT = 0;
    FS_proto.WRITING = 1;
    FS_proto.DONE = 2;

    FS_proto.error =
    FS_proto.onwritestart =
    FS_proto.onprogress =
    FS_proto.onwrite =
    FS_proto.onabort =
    FS_proto.onerror =
    FS_proto.onwriteend =
        null;

    return saveAs;
}(
       typeof self !== "undefined" && self
    || typeof window !== "undefined" && window
    || this.content
));
// `self` is undefined in Firefox for Android content script context
// while `this` is nsIContentFrameMessageManager
// with an attribute `content` that corresponds to the window

if (typeof module !== "undefined" && module !== null) {
  module.exports = saveAs;
} else if ((typeof define !== "undefined" && define !== null) && (define.amd != null)) {
  define([], function() {
    return saveAs;
  });
}

(function(view){
    "use strict";
    var characters = ‘ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=‘;
    var fromCharCode = String.fromCharCode;
    var INVALID_CHARACTER_ERR = ( function() {
        // fabricate a suitable error object
        try {
            document.createElement(‘$‘);
        } catch (error) {
            return error;
        }
    }());

    // encoder
    var btoa = function(string) {
        var a, b, b1, b2, b3, b4, c, i = 0, len = string.length, max = Math.max, result = ‘‘;

        while (i < len) {
            a = string.charCodeAt(i++) || 0;
            b = string.charCodeAt(i++) || 0;
            c = string.charCodeAt(i++) || 0;

            if (max(a, b, c) > 0xFF) {
                throw INVALID_CHARACTER_ERR;
            }

            b1 = (a >> 2) & 0x3F;
            b2 = ((a & 0x3) << 4) | ((b >> 4) & 0xF);
            b3 = ((b & 0xF) << 2) | ((c >> 6) & 0x3);
            b4 = c & 0x3F;

            if (!b) {
                b3 = b4 = 64;
            } else if (!c) {
                b4 = 64;
            }
            result += characters.charAt(b1) + characters.charAt(b2) + characters.charAt(b3) + characters.charAt(b4);
        }
        return result;
    };

    //获取dom文本
    var getText = function( el ){
        var s = el.textContent || el.innerText;
        return s == null ? "" : s.replace( /^\s*(.*?)\s+$/, "$1");
    };
    view.tableExport = function(tableId, filename, type){
        var doc = view.document,
            table = doc.getElementById(tableId),
            charSet = doc.characterSet

        var uri = {
            json: ‘application/json;charset=‘+charSet,
            txt: ‘csv/txt;charset=‘+charSet,
            csv: ‘csv/txt;charset=‘+charSet,
            doc: ‘application/vnd.ms-doc‘, 
            excel: ‘application/vnd.ms-excel‘
        };

        var base64 = function(s) {
            return btoa(unescape(encodeURIComponent(s)));
        };
        var template = function(s, c) {
            return s.replace(/{(\w+)}/g, function(m, p) {
                return c[p];
            });
        };

        var    get_blob = function() {
            return view.Blob;
        }

        var fixCSVField = function(value) {
            var fixedValue = value;
            var addQuotes = (value.indexOf(‘,‘) !== -1) || (value.indexOf(‘\r‘) !== -1) || (value.indexOf(‘\n‘) !== -1);
            var replaceDoubleQuotes = (value.indexOf(‘"‘) !== -1);

            if (replaceDoubleQuotes) {
                fixedValue = fixedValue.replace(/"/g, ‘""‘);
            }
            if (addQuotes || replaceDoubleQuotes) {
                fixedValue = ‘"‘ + fixedValue + ‘"‘;
            }
            return fixedValue;
        };

        var saveData = function(data){
            var BB = get_blob();
            saveAs(new BB([data], {type: uri[type]}), filename + "."+type);
        };

        var toCSV = function(){
            var data = "\ufeff";
            for (var i = 0, row; row = table.rows[i]; i++) {
                for (var j = 0, col; col = row.cells[j]; j++) {
                    data = data + (j ? ‘,‘ : ‘‘) + fixCSVField(getText(col));
                }
                data = data + "\r\n";
            }
            saveData(data);
        };

        var toJson = function(){
            var jsonHeaderArray = [];

            if(table.tHead){
                for(var i =0,col; col = table.tHead.rows[0].cells[i]; i++){
                    jsonHeaderArray.push(getText(col));
                }
            }

            var jsonArray = [];
            if(table.tBodies){
                for(var j=0,tbody; tbody = table.tBodies[j]; j++){
                    for(var k =0, rowb; rowb= tbody.rows[k]; k++){
                        var len = jsonArray.length;
                        jsonArray[len]  = [];
                        for (var g = 0, colb; colb = rowb.cells[g]; g++) {
                            jsonArray[len].push(getText(colb));
                        }
                    }
                }
            }

            var jsonExportArray = {
                header: jsonHeaderArray,
                data: jsonArray
            };
            saveData(JSON.stringify(jsonExportArray));
        };

        var toOffice = function(){
            var tmpl = ‘<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:‘+type+‘" xmlns="http://www.w3.org/TR/REC-html40">‘;
            tmpl += ‘<head><meta charset="‘+charSet+‘" /><!--[if gte mso 9]><xml><x:ExcelWorkbook><x:ExcelWorksheets><x:ExcelWorksheet><x:Name>‘;
            tmpl += ‘{worksheet}</x:Name><x:WorksheetOptions><x:DisplayGridlines/></x:WorksheetOptions></x:ExcelWorksheet></x:ExcelWorksheets></x:ExcelWorkbook></xml><![endif]-->‘;
              tmpl += ‘</head><body><table>{table}</table></body></html>‘;
            var office = ‘‘,
                maph = [[‘<thead><tr>‘, ‘</tr></thead>‘], [‘<tbody><tr>‘, ‘</tr></tbody>‘], [‘<tr>‘, ‘</tr>‘]],
                mapb = [[‘<th>‘, ‘</th>‘],[‘<td>‘, ‘</td>‘]],
                flag = +!table.tHead,
                com = 1 - flag;

            for(var i=0, row; row = table.rows[i]; i++){
                flag = i > com ? 2 : flag;
                office += maph[flag][0];
                for(var j =0, col; col = row.cells[j]; j++){
                    office += mapb[+!!flag][0]+ getText(col) +mapb[+!!flag][1];
                }
                office += maph[flag][1];
                flag++;
            }
            saveData(template(tmpl, {worksheet: ‘Worksheet‘, table: office}));
        };

        var typeMap = {
            json : toJson,
            txt: toCSV,
            csv: toCSV,
            doc: toOffice,
            docx: toOffice,
            xls: toOffice,
            xlsx: toOffice
        };

        typeMap[type]();
    };

})(window);