Vue 下载 Excel 文件
/*
* A Blob, File, FileReader & URL implementation.
* 2018-08-09
*
* By Eli Grey,
* By Jimmy Wärting, /jimmywarting
* License: MIT
* See /eligrey//blob/master/
*/
;(function(){
var global = typeof window === 'object'
? window : typeof self === 'object'
? self : this
var BlobBuilder = global.BlobBuilder
|| global.WebKitBlobBuilder
|| global.MSBlobBuilder
|| global.MozBlobBuilder;
global.URL = global.URL || global.webkitURL || function(href, a) {
a = document.createElement('a')
a.href = href
return a
}
var origBlob = global.Blob
var createObjectURL = URL.createObjectURL
var revokeObjectURL = URL.revokeObjectURL
var strTag = global.Symbol && global.Symbol.toStringTag
var blobSupported = false
var blobSupportsArrayBufferView = false
var arrayBufferSupported = !!global.ArrayBuffer
var blobBuilderSupported = BlobBuilder
&& BlobBuilder.prototype.append
&& BlobBuilder.prototype.getBlob;
try {
// Check if Blob constructor is supported
blobSupported = new Blob(['ä']).size === 2
// Check if Blob constructor supports ArrayBufferViews
// Fails in Safari 6, so we need to map to ArrayBuffers there.
blobSupportsArrayBufferView = new Blob([new Uint8Array([1,2])]).size === 2
} catch(e) {}
/**
* Helper function that maps ArrayBufferViews to ArrayBuffers
* Used by BlobBuilder constructor and old browsers that didn't
* support it in the Blob constructor.
*/
function mapArrayBufferViews(ary) {
return ary.map(function(chunk) {
if (chunk.buffer instanceof ArrayBuffer) {
var buf = chunk.buffer;
// if this is a subarray, make a copy so we only
// include the subarray region from the underlying buffer
if (chunk.byteLength !== buf.byteLength) {
var copy = new Uint8Array(chunk.byteLength);
copy.set(new Uint8Array(buf, chunk.byteOffset, chunk.byteLength));
buf = copy.buffer;
}
return buf;
}
return chunk;
});
}
function BlobBuilderConstructor(ary, options) {
options = options || {};
var bb = new BlobBuilder();
mapArrayBufferViews(ary).forEach(function(part) {
bb.append(part);
});
return options.type ? bb.getBlob(options.type) : bb.getBlob();
};
function BlobConstructor(ary, options) {
return new origBlob(mapArrayBufferViews(ary), options || {});
};
if (global.Blob) {
BlobBuilderConstructor.prototype = Blob.prototype;
BlobConstructor.prototype = Blob.prototype;
}
function FakeBlobBuilder() {
function toUTF8Array(str) {
var utf8 = [];
for (var i=0; i < str.length; i++) {
var charcode = str.charCodeAt(i);
if (charcode < 0x80) utf8.push(charcode);
else if (charcode < 0x800) {
utf8.push(0xc0 | (charcode >> 6),
0x80 | (charcode & 0x3f));
}
else if (charcode < 0xd800 || charcode >= 0xe000) {
utf8.push(0xe0 | (charcode >> 12),
0x80 | ((charcode>>6) & 0x3f),
0x80 | (charcode & 0x3f));
}
// surrogate pair
else {
i++;
// UTF-16 encodes 0x10000-0x10FFFF by
// subtracting 0x10000 and splitting the
// 20 bits of 0x0-0xFFFFF into two halves
charcode = 0x10000 + (((charcode & 0x3ff)<<10)
| (str.charCodeAt(i) & 0x3ff));
utf8.push(0xf0 | (charcode >>18),
0x80 | ((charcode>>12) & 0x3f),
0x80 | ((charcode>>6) & 0x3f),
0x80 | (charcode & 0x3f));
}
}
return utf8;
}
function fromUtf8Array(array) {
var out, i, len, c;
var char2, char3;
out = "";
len = array.length;
i = 0;
while (i < len) {
c = array[i++];
switch (c >> 4)
{
case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
// 0xxxxxxx
out += String.fromCharCode(c);
break;
case 12: case 13:
// 110x xxxx 10xx xxxx
char2 = array[i++];
out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));
break;
case 14:
// 1110 xxxx 10xx xxxx 10xx xxxx
char2 = array[i++];
char3 = array[i++];
out += String.fromCharCode(((c & 0x0F) << 12) |
((char2 & 0x3F) << 6) |
((char3 & 0x3F) << 0));
break;
}
}
return out;
}
function isDataView(obj) {
return obj && DataView.prototype.isPrototypeOf(obj)
}
function bufferClone(buf) {
var view = new Array(buf.byteLength)
var array = new Uint8Array(buf)
var i = view.length
while(i--) {
view[i] = array[i]
}
return view
}
function encodeByteArray(input) {
var byteToCharMap = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'
var output = [];
for (var i = 0; i < input.length; i += 3) {
var byte1 = input[i];
var haveByte2 = i + 1 < input.length;
var byte2 = haveByte2 ? input[i + 1] : 0;
var haveByte3 = i + 2 < input.length;
var byte3 = haveByte3 ? input[i + 2] : 0;
var outByte1 = byte1 >> 2;
var outByte2 = ((byte1 & 0x03) << 4) | (byte2 >> 4);
var outByte3 = ((byte2 & 0x0F) << 2) | (byte3 >> 6);
var outByte4 = byte3 & 0x3F;
if (!haveByte3) {
outByte4 = 64;
if (!haveByte2) {
outByte3 = 64;
}
}
output.push(
byteToCharMap[outByte1], byteToCharMap[outByte2],
byteToCharMap[outByte3], byteToCharMap[outByte4])
}
return output.join('')
}
var create = Object.create || function (a) {
function c() {}
c.prototype = a;
return new c
}
if (arrayBufferSupported) {
var viewClasses = [
'[object Int8Array]',
'[object Uint8Array]',
'[object Uint8ClampedArray]',
'[object Int16Array]',
'[object Uint16Array]',
'[object Int32Array]',
'[object Uint32Array]',
'[object Float32Array]',
'[object Float64Array]'
]
var isArrayBufferView = ArrayBuffer.isView || function(obj) {
return obj && viewClasses.indexOf(Object.prototype.toString.call(obj)) > -1
}
}
/********************************************************/
/* Blob constructor */
/********************************************************/
function Blob(chunks, opts) {
chunks = chunks || []
for (var i = 0, len = chunks.length; i < len; i++) {
var chunk = chunks[i]
if (chunk instanceof Blob) {
chunks[i] = chunk._buffer
} else if (typeof chunk === 'string') {
chunks[i] = toUTF8Array(chunk)
} else if (arrayBufferSupported && (ArrayBuffer.prototype.isPrototypeOf(chunk) || isArrayBufferView(chunk))) {
chunks[i] = bufferClone(chunk)
} else if (arrayBufferSupported && isDataView(chunk)) {
chunks[i] = bufferClone(chunk.buffer)
} else {
chunks[i] = toUTF8Array(String(chunk))
}
}
this._buffer = [].concat.apply([], chunks)
this.size = this._buffer.length
this.type = opts ? opts.type || '' : ''
}
Blob.prototype.slice = function(start, end, type) {
var slice = this._buffer.slice(start || 0, end || this._buffer.length)
return new Blob([slice], {type: type})
}
Blob.prototype.toString = function() {
return '[object Blob]'
}
/********************************************************/
/* File constructor */
/********************************************************/
function File(chunks, name, opts) {
opts = opts || {}
var a = Blob.call(this, chunks, opts) || this
a.name = name
a.lastModifiedDate = opts.lastModified ? new Date(opts.lastModified) : new Date
a.lastModified = +a.lastModifiedDate
return a
}
File.prototype = create(Blob.prototype);
File.prototype.constructor = File;
if (Object.setPrototypeOf)
Object.setPrototypeOf(File, Blob);
else {
try {File.__proto__ = Blob} catch (e) {}
}
File.prototype.toString = function() {
return '[object File]'
}
/********************************************************/
/* FileReader constructor */
/********************************************************/
function FileReader() {
if (!(this instanceof FileReader))
throw new TypeError("Failed to construct 'FileReader': Please use the 'new' operator, this DOM object constructor cannot be called as a function.")
var delegate = document.createDocumentFragment()
this.addEventListener = delegate.addEventListener
this.dispatchEvent = function(evt) {
var local = this['on' + evt.type]
if (typeof local === 'function') local(evt)
delegate.dispatchEvent(evt)
}
this.removeEventListener = delegate.removeEventListener
}
function _read(fr, blob, kind) {
if (!(blob instanceof Blob))
throw new TypeError("Failed to execute '" + kind + "' on 'FileReader': parameter 1 is not of type 'Blob'.")
fr.result = ''
setTimeout(function(){
this.readyState = FileReader.LOADING
fr.dispatchEvent(new Event('load'))
fr.dispatchEvent(new Event('loadend'))
})
}
FileReader.EMPTY = 0
FileReader.LOADING = 1
FileReader.DONE = 2
FileReader.prototype.error = null
FileReader.prototype.onabort = null
FileReader.prototype.onerror = null
FileReader.prototype.onload = null
FileReader.prototype.onloadend = null
FileReader.prototype.onloadstart = null
FileReader.prototype.onprogress = null
FileReader.prototype.readAsDataURL = function(blob) {
_read(this, blob, 'readAsDataURL')
this.result = 'data:' + blob.type + ';base64,' + encodeByteArray(blob._buffer)
}
FileReader.prototype.readAsText = function(blob) {
_read(this, blob, 'readAsText')
this.result = fromUtf8Array(blob._buffer)
}
FileReader.prototype.readAsArrayBuffer = function(blob) {
_read(this, blob, 'readAsText')
this.result = blob._buffer.slice()
}
FileReader.prototype.abort = function() {}
/********************************************************/
/* URL */
/********************************************************/
URL.createObjectURL = function(blob) {
return blob instanceof Blob
? 'data:' + blob.type + ';base64,' + encodeByteArray(blob._buffer)
: createObjectURL.call(URL, blob)
}
URL.revokeObjectURL = function(url) {
revokeObjectURL && revokeObjectURL.call(URL, url)
}
/********************************************************/
/* XHR */
/********************************************************/
var _send = global.XMLHttpRequest && global.XMLHttpRequest.prototype.send
if (_send) {
XMLHttpRequest.prototype.send = function(data) {
if (data instanceof Blob) {
this.setRequestHeader('Content-Type', data.type)
_send.call(this, fromUtf8Array(data._buffer))
} else {
_send.call(this, data)
}
}
}
global.FileReader = FileReader
global.File = File
global.Blob = Blob
}
if (strTag) {
File.prototype[strTag] = 'File'
Blob.prototype[strTag] = 'Blob'
FileReader.prototype[strTag] = 'FileReader'
}
function fixFileAndXHR() {
var isIE = !!global.ActiveXObject || (
'-ms-scroll-limit' in document.documentElement.style &&
'-ms-ime-align' in document.documentElement.style
)
// Monkey patched
// IE don't set Content-Type header on XHR whose body is a typed Blob
// /en-us/microsoft-edge/platform/issues/6047383
var _send = global.XMLHttpRequest && global.XMLHttpRequest.prototype.send
if (isIE && _send) {
XMLHttpRequest.prototype.send = function(data) {
if (data instanceof Blob) {
this.setRequestHeader('Content-Type', data.type)
_send.call(this, data)
} else {
_send.call(this, data)
}
}
}
try {
new File([], '')
} catch(e) {
try {
var klass = new Function('class File extends Blob {' +
'constructor(chunks, name, opts) {' +
'opts = opts || {};' +
'super(chunks, opts || {});' +
' = name;' +
' = ? new Date() : new Date;' +
' = +;' +
'}};' +
'return new File([], ""), File'
)()
global.File = klass
} catch(e) {
var klass = function(b, d, c) {
var blob = new Blob(b, c)
var t = c && void 0 !== c.lastModified ? new Date(c.lastModified) : new Date
blob.name = d
blob.lastModifiedDate = t
blob.lastModified = +t
blob.toString = function() {
return '[object File]'
}
if (strTag)
blob[strTag] = 'File'
return blob
}
global.File = klass
}
}
}
if (blobSupported) {
fixFileAndXHR()
global.Blob = blobSupportsArrayBufferView ? global.Blob : BlobConstructor
} else if (blobBuilderSupported) {
fixFileAndXHR()
global.Blob = BlobBuilderConstructor;
} else {
FakeBlobBuilder()
}
})();