微信小程序直接上传文件到阿里云OSS组件封装
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微信小程序直接上传文件到OSS
1. 封装公共方法
在根目录utils目录新建一个upload文件夹：
// utils/upload/base64.js
var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var base64DecodeChars = new Array(
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1);
function encode(str)
var out, i, len;
var c1, c2, c3;
len = str.length;
i = 0;
out = "";
while (i < len)
c1 = str.charCodeAt(i++) & 0xff;
if (i == len)
out += base64EncodeChars.charAt(c1 >> 2);
out += base64EncodeChars.charAt((c1 & 0x3) << 4);
out += "==";
break;
c2 = str.charCodeAt(i++);
if (i == len)
out += base64EncodeChars.charAt(c1 >> 2);
out += base64EncodeChars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xF0) >> 4));
out += base64EncodeChars.charAt((c2 & 0xF) << 2);
out += "=";
break;
c3 = str.charCodeAt(i++);
out += base64EncodeChars.charAt(c1 >> 2);
out += base64EncodeChars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xF0) >> 4));
out += base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >> 6));
out += base64EncodeChars.charAt(c3 & 0x3F);
return out;
function decode(str)
var c1, c2, c3, c4;
var i, len, out;
len = str.length;
i = 0;
out = "";
while (i < len)
/* c1 */
do
c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
while (i < len && c1 == -1);
if (c1 == -1)
break;
/* c2 */
do
c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
while (i < len && c2 == -1);
if (c2 == -1)
break;
out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));
/* c3 */
do
c3 = str.charCodeAt(i++) & 0xff;
if (c3 == 61)
return out;
c3 = base64DecodeChars[c3];
while (i < len && c3 == -1);
if (c3 == -1)
break;
out += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));
/* c4 */
do
c4 = str.charCodeAt(i++) & 0xff;
if (c4 == 61)
return out;
c4 = base64DecodeChars[c4];
while (i < len && c4 == -1);
if (c4 == -1)
break;
out += String.fromCharCode(((c3 & 0x03) << 6) | c4);
return out;
function utf16to8(str)
var out, i, len, c;
out = "";
len = str.length;
for (i = 0; i < len; i++)
c = str.charCodeAt(i);
if ((c >= 0x0001) && (c <= 0x007F))
out += str.charAt(i);
else if (c > 0x07FF)
out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));
out += String.fromCharCode(0x80 | ((c >> 6) & 0x3F));
out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
else
out += String.fromCharCode(0xC0 | ((c >> 6) & 0x1F));
out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
return out;
function utf8to16(str)
var out, i, len, c;
var char2, char3;
out = "";
len = str.length;
i = 0;
while (i < len)
c = str.charCodeAt(i++);
switch (c >> 4)
case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
// 0xxxxxxx
out += str.charAt(i - 1);
break;
case 12: case 13:
// 110x xxxx 10xx xxxx
char2 = str.charCodeAt(i++);
out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));
break;
case 14:
// 1110 xxxx 10xx xxxx 10xx xxxx
char2 = str.charCodeAt(i++);
char3 = str.charCodeAt(i++);
out += String.fromCharCode(((c & 0x0F) << 12) |
((char2 & 0x3F) << 6) |
((char3 & 0x3F) << 0));
break;
return out;
module.exports =
encode: encode,
decode: decode,
utf16to8: utf16to8,
utf8to16: utf8to16
// utils/upload/base64.js
const Crypto = ;
(function()
var base64map = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
// Crypto utilities
var util = Crypto.util =
// Bit-wise rotate left
rotl: function (n, b)
return (n << b) | (n >>> (32 - b));
,
// Bit-wise rotate right
rotr: function (n, b)
return (n << (32 - b)) | (n >>> b);
,
// Swap big-endian to little-endian and vice versa
endian: function (n)
// If number given, swap endian
if (n.constructor == Number)
return util.rotl(n, 8) & 0x00FF00FF |
util.rotl(n, 24) & 0xFF00FF00;
// Else, assume array and swap all items
for (var i = 0; i < n.length; i++)
n[i] = util.endian(n[i]);
return n;
,
// Generate an array of any length of random bytes
randomBytes: function (n)
for (var bytes = []; n > 0; n--)
bytes.push(Math.floor(Math.random() * 256));
return bytes;
,
// Convert a string to a byte array
stringToBytes: function (str)
var bytes = [];
for (var i = 0; i < str.length; i++)
bytes.push(str.charCodeAt(i));
return bytes;
,
// Convert a byte array to a string
bytesToString: function (bytes)
var str = [];
for (var i = 0; i < bytes.length; i++)
str.push(String.fromCharCode(bytes[i]));
return str.join("");
,
// Convert a string to big-endian 32-bit words
stringToWords: function (str)
var words = [];
for (var c = 0, b = 0; c < str.length; c++, b += 8)
words[b >>> 5] |= str.charCodeAt(c) << (24 - b % 32);
return words;
,
// Convert a byte array to big-endian 32-bits words
bytesToWords: function (bytes)
var words = [];
for (var i = 0, b = 0; i < bytes.length; i++, b += 8)
words[b >>> 5] |= bytes[i] << (24 - b % 32);
return words;
,
// Convert big-endian 32-bit words to a byte array
wordsToBytes: function (words)
var bytes = [];
for (var b = 0; b < words.length * 32; b += 8)
bytes.push((words[b >>> 5] >>> (24 - b % 32)) & 0xFF);
return bytes;
,
// Convert a byte array to a hex string
bytesToHex: function (bytes)
var hex = [];
for (var i = 0; i < bytes.length; i++)
hex.push((bytes[i] >>><以上是关于微信小程序直接上传文件到阿里云OSS组件封装的主要内容，如果未能解决你的问题，请参考以下文章