二月 2018 - SKILL.NULL

function base64_encode (str) { // 编码，配合encodeURIComponent使用

var c1, c2, c3;

var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

var i = 0, len = str.length, strin = '';

while (i < len) {

c1 = str.charCodeAt(i++) & 0xff;

if (i == len) {

strin += base64EncodeChars.charAt(c1 >> 2);

strin += base64EncodeChars.charAt((c1 & 0x3) << 4);

strin += "==";

break;

}

c2 = str.charCodeAt(i++);

if (i == len) {

strin += base64EncodeChars.charAt(c1 >> 2);

strin += base64EncodeChars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xF0) >> 4));

strin += base64EncodeChars.charAt((c2 & 0xF) << 2);

strin += "=";

break;

}

c3 = str.charCodeAt(i++);

strin += base64EncodeChars.charAt(c1 >> 2);

strin += base64EncodeChars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xF0) >> 4));

strin += base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >> 6));

strin += base64EncodeChars.charAt(c3 & 0x3F)

}

return strin

}

function base64_decode (input) { // 解码，配合decodeURIComponent使用

var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

var output = "";

var chr1, chr2, chr3;

var enc1, enc2, enc3, enc4;

var i = 0;

input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

while (i < input.length) {

enc1 = base64EncodeChars.indexOf(input.charAt(i++));

enc2 = base64EncodeChars.indexOf(input.charAt(i++));

enc3 = base64EncodeChars.indexOf(input.charAt(i++));

enc4 = base64EncodeChars.indexOf(input.charAt(i++));

chr1 = (enc1 << 2) | (enc2 >> 4);

chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);

chr3 = ((enc3 & 3) << 6) | enc4;

output = output + String.fromCharCode(chr1);

if (enc3 != 64) {

output = output + String.fromCharCode(chr2);

}

if (enc4 != 64) {

output = output + String.fromCharCode(chr3);

}

return utf8_decode(output);

}

function utf8_decode (utftext) { // utf-8解码

var string = '';

let i = 0;

let c = 0;

let c1 = 0;

let c2 = 0;

while (i < utftext.length) {

c = utftext.charCodeAt(i);

if (c < 128) {

string += String.fromCharCode(c);

i++;

} else if ((c > 191) && (c < 224)) {

c1 = utftext.charCodeAt(i + 1);

string += String.fromCharCode(((c & 31) << 6) | (c1 & 63));

i += 2;

} else {

c1 = utftext.charCodeAt(i + 1);

c2 = utftext.charCodeAt(i + 2);

string += String.fromCharCode(((c & 15) << 12) | ((c1 & 63) << 6) | (c2 & 63));

i += 3;

}

return string;

}

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月份：2018年2月

微信小程序base64编码解码以及utf-8解码