3 base64加解密
base64是通用的加解密方法，JavaScript也有现成的库可以使用，PHP更是有现成函数可用。
解决方法如下。
首先，前端引用base64加密库，推荐用支持中文的库：https://github.com/emn178/hi-base64
数据提交之前，用base64的方法加密：
var html_source = base64.encode(html_source)这样不论什么字符，都可以提交了，都是。
然后，在PHP读取数据时，用base64_decode() 方法就可以解密了。
$html_source = str_replace(' ', '+', $html_source);
$html_source = base64_decode($html_source);
下面是base64.js文件的内容
1 /* 2 * [hi-base64]{@link https://github.com/emn178/hi-base64} 3 * 4 * @version 0.2.1 5 * @author Chen, Yi-Cyuan [emn178@gmail.com] 6 * @copyright Chen, Yi-Cyuan 2014-2017 7 * @license MIT 8 */ 9 /*jslint bitwise: true */ 10 (function () { 11 'use strict'; 12 13 var root = typeof window === 'object' ? window : {}; 14 var NODE_JS = !root.HI_BASE64_NO_NODE_JS && typeof process === 'object' && process.versions && process.versions.node; 15 if (NODE_JS) { 16 root = global; 17 } 18 var COMMON_JS = !root.HI_BASE64_NO_COMMON_JS && typeof module === 'object' && module.exports; 19 var AMD = typeof define === 'function' && define.amd; 20 var BASE64_ENCODE_CHAR = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'.split(''); 21 var BASE64_DECODE_CHAR = { 22 'A': 0, 'B': 1, 'C': 2, 'D': 3, 'E': 4, 'F': 5, 'G': 6, 'H': 7, 'I': 8, 23 'J': 9, 'K': 10, 'L': 11, 'M': 12, 'N': 13, 'O': 14, 'P': 15, 'Q': 16, 24 'R': 17, 'S': 18, 'T': 19, 'U': 20, 'V': 21, 'W': 22, 'X': 23, 'Y': 24, 25 'Z': 25, 'a': 26, 'b': 27, 'c': 28, 'd': 29, 'e': 30, 'f': 31, 'g': 32, 26 'h': 33, 'i': 34, 'j': 35, 'k': 36, 'l': 37, 'm': 38, 'n': 39, 'o': 40, 27 'p': 41, 'q': 42, 'r': 43, 's': 44, 't': 45, 'u': 46, 'v': 47, 'w': 48, 28 'x': 49, 'y': 50, 'z': 51, '0': 52, '1': 53, '2': 54, '3': 55, '4': 56, 29 '5': 57, '6': 58, '7': 59, '8': 60, '9': 61, '+': 62, '/': 63, '-': 62, 30 '_': 63 31 }; 32 33 var utf8ToBytes = function (str) { 34 var bytes = []; 35 for (var i = 0; i < str.length; i++) { 36 var c = str.charCodeAt(i); 37 if (c < 0x80) { 38 bytes[bytes.length] = c; 39 } else if (c < 0x800) { 40 bytes[bytes.length] = 0xc0 | (c >> 6); 41 bytes[bytes.length] = 0x80 | (c & 0x3f); 42 } else if (c < 0xd800 || c >= 0xe000) { 43 bytes[bytes.length] = 0xe0 | (c >> 12); 44 bytes[bytes.length] = 0x80 | ((c >> 6) & 0x3f); 45 bytes[bytes.length] = 0x80 | (c & 0x3f); 46 } else { 47 c = 0x10000 + (((c & 0x3ff) << 10) | (str.charCodeAt(++i) & 0x3ff)); 48 bytes[bytes.length] = 0xf0 | (c >> 18); 49 bytes[bytes.length] = 0x80 | ((c >> 12) & 0x3f); 50 bytes[bytes.length] = 0x80 | ((c >> 6) & 0x3f); 51 bytes[bytes.length] = 0x80 | (c & 0x3f); 52 } 53 } 54 return bytes; 55 }; 56 57 var decodeAsBytes = function (base64Str) { 58 var v1, v2, v3, v4, bytes = [], index = 0, length = base64Str.length; 59 if (base64Str.charAt(length - 2) === '=') { 60 length -= 2; 61 } else if (base64Str.charAt(length - 1) === '=') { 62 length -= 1; 63 } 64 65 // 4 char to 3 bytes 66 for (var i = 0, count = length >> 2 << 2; i < count;) { 67 v1 = BASE64_DECODE_CHAR[base64Str.charAt(i++)]; 68 v2 = BASE64_DECODE_CHAR[base64Str.charAt(i++)]; 69 v3 = BASE64_DECODE_CHAR[base64Str.charAt(i++)]; 70 v4 = BASE64_DECODE_CHAR[base64Str.charAt(i++)]; 71 bytes[index++] = (v1 << 2 | v2 >>> 4) & 255; 72 bytes[index++] = (v2 << 4 | v3 >>> 2) & 255; 73 bytes[index++] = (v3 << 6 | v4) & 255; 74 } 75 76 // remain bytes 77 var remain = length - count; 78 if (remain === 2) { 79 v1 = BASE64_DECODE_CHAR[base64Str.charAt(i++)]; 80 v2 = BASE64_DECODE_CHAR[base64Str.charAt(i++)]; 81 bytes[index++] = (v1 << 2 | v2 >>> 4) & 255; 82 } else if (remain === 3) { 83 v1 = BASE64_DECODE_CHAR[base64Str.charAt(i++)]; 84 v2 = BASE64_DECODE_CHAR[base64Str.charAt(i++)]; 85 v3 = BASE64_DECODE_CHAR[base64Str.charAt(i++)]; 86 bytes[index++] = (v1 << 2 | v2 >>> 4) & 255; 87 bytes[index++] = (v2 << 4 | v3 >>> 2) & 255; 88 } 89 return bytes; 90 }; 91 92 var encodeFromBytes = function (bytes) { 93 var v1, v2, v3, base64Str = '', length = bytes.length; 94 for (var i = 0, count = parseInt(length / 3) * 3; i < count;) { 95 v1 = bytes[i++]; 96 v2 = bytes[i++]; 97 v3 = bytes[i++]; 98 base64Str += BASE64_ENCODE_CHAR[v1 >>> 2] + 99 BASE64_ENCODE_CHAR[(v1 << 4 | v2 >>> 4) & 63] + 100 BASE64_ENCODE_CHAR[(v2 << 2 | v3 >>> 6) & 63] + 101 BASE64_ENCODE_CHAR[v3 & 63]; 102 } 103 104 // remain char 105 var remain = length - count; 106 if (remain === 1) { 107 v1 = bytes[i]; 108 base64Str += BASE64_ENCODE_CHAR[v1 >>> 2] + 109 BASE64_ENCODE_CHAR[(v1 << 4) & 63] + 110 '=='; 111 } else if (remain === 2) { 112 v1 = bytes[i++]; 113 v2 = bytes[i]; 114 base64Str += BASE64_ENCODE_CHAR[v1 >>> 2] + 115 BASE64_ENCODE_CHAR[(v1 << 4 | v2 >>> 4) & 63] + 116 BASE64_ENCODE_CHAR[(v2 << 2) & 63] + 117 '='; 118 } 119 return base64Str; 120 }; 121 122 var btoa = root.btoa, atob = root.atob, utf8Base64Encode, utf8Base64Decode; 123 if (NODE_JS) { 124 var Buffer = require('buffer').Buffer; 125 btoa = function (str) { 126 return new Buffer(str, 'ascii').toString('base64'); 127 }; 128 129 utf8Base64Encode = function (str) { 130 return new Buffer(str).toString('base64'); 131 }; 132 133 encodeFromBytes = utf8Base64Encode; 134 135 atob = function (base64Str) { 136 return new Buffer(base64Str, 'base64').toString('ascii'); 137 }; 138 139 utf8Base64Decode = function (base64Str) { 140 return new Buffer(base64Str, 'base64').toString(); 141 }; 142 } else if (!btoa) { 143 btoa = function (str) { 144 var v1, v2, v3, base64Str = '', length = str.length; 145 for (var i = 0, count = parseInt(length / 3) * 3; i < count;) { 146 v1 = str.charCodeAt(i++); 147 v2 = str.charCodeAt(i++); 148 v3 = str.charCodeAt(i++); 149 base64Str += BASE64_ENCODE_CHAR[v1 >>> 2] + 150 BASE64_ENCODE_CHAR[(v1 << 4 | v2 >>> 4) & 63] + 151 BASE64_ENCODE_CHAR[(v2 << 2 | v3 >>> 6) & 63] + 152 BASE64_ENCODE_CHAR[v3 & 63]; 153 } 154 155 // remain char 156 var remain = length - count; 157 if (remain === 1) { 158 v1 = str.charCodeAt(i); 159 base64Str += BASE64_ENCODE_CHAR[v1 >>> 2] + 160 BASE64_ENCODE_CHAR[(v1 << 4) & 63] + 161 '=='; 162 } else if (remain === 2) { 163 v1 = str.charCodeAt(i++); 164 v2 = str.charCodeAt(i); 165 base64Str += BASE64_ENCODE_CHAR[v1 >>> 2] + 166 BASE64_ENCODE_CHAR[(v1 << 4 | v2 >>> 4) & 63] + 167 BASE64_ENCODE_CHAR[(v2 << 2) & 63] + 168 '='; 169 } 170 return base64Str; 171 }; 172 173 utf8Base64Encode = function (str) { 174 var v1, v2, v3, base64Str = '', bytes = utf8ToBytes(str), length = bytes.length; 175 for (var i = 0, count = parseInt(length / 3) * 3; i < count;) { 176 v1 = bytes[i++]; 177 v2 = bytes[i++]; 178 v3 = bytes[i++]; 179 base64Str += BASE64_ENCODE_CHAR[v1 >>> 2] + 180 BASE64_ENCODE_CHAR[(v1 << 4 | v2 >>> 4) & 63] + 181 BASE64_ENCODE_CHAR[(v2 << 2 | v3 >>> 6) & 63] + 182 BASE64_ENCODE_CHAR[v3 & 63]; 183 } 184 185 // remain char 186 var remain = length - count; 187 if (remain === 1) { 188 v1 = bytes[i]; 189 base64Str += BASE64_ENCODE_CHAR[v1 >>> 2] + 190 BASE64_ENCODE_CHAR[(v1 << 4) & 63] + 191 '=='; 192 } else if (remain === 2) { 193 v1 = bytes[i++]; 194 v2 = bytes[i]; 195 base64Str += BASE64_ENCODE_CHAR[v1 >>> 2] + 196 BASE64_ENCODE_CHAR[(v1 << 4 | v2 >>> 4) & 63] + 197 BASE64_ENCODE_CHAR[(v2 << 2) & 63] + 198 '='; 199 } 200 return base64Str; 201 }; 202 203 atob = function (base64Str) { 204 var v1, v2, v3, v4, str = '', length = base64Str.length; 205 if (base64Str.charAt(length - 2) === '=') { 206 length -= 2; 207 } else if (base64Str.charAt(length - 1) === '=') { 208 length -= 1; 209 } 210 211 // 4 char to 3 bytes 212 for (var i = 0, count = length >> 2 << 2; i < count;) { 213 v1 = BASE64_DECODE_CHAR[base64Str.charAt(i++)]; 214 v2 = BASE64_DECODE_CHAR[base64Str.charAt(i++)]; 215 v3 = BASE64_DECODE_CHAR[base64Str.charAt(i++)]; 216 v4 = BASE64_DECODE_CHAR[base64Str.charAt(i++)]; 217 str += String.fromCharCode((v1 << 2 | v2 >>> 4) & 255) + 218 String.fromCharCode((v2 << 4 | v3 >>> 2) & 255) + 219 String.fromCharCode((v3 << 6 | v4) & 255); 220 } 221 222 // remain bytes 223 var remain = length - count; 224 if (remain === 2) { 225 v1 = BASE64_DECODE_CHAR[base64Str.charAt(i++)]; 226 v2 = BASE64_DECODE_CHAR[base64Str.charAt(i++)]; 227 str += String.fromCharCode((v1 << 2 | v2 >>> 4) & 255); 228 } else if (remain === 3) { 229 v1 = BASE64_DECODE_CHAR[base64Str.charAt(i++)]; 230 v2 = BASE64_DECODE_CHAR[base64Str.charAt(i++)]; 231 v3 = BASE64_DECODE_CHAR[base64Str.charAt(i++)]; 232 str += String.fromCharCode((v1 << 2 | v2 >>> 4) & 255) + 233 String.fromCharCode((v2 << 4 | v3 >>> 2) & 255); 234 } 235 return str; 236 }; 237 238 utf8Base64Decode = function (base64Str) { 239 var str = '', bytes = decodeAsBytes(base64Str), length = bytes.length; 240 var i = 0, followingChars = 0, b, c; 241 while (i < length) { 242 b = bytes[i++]; 243 if (b <= 0x7F) { 244 str += String.fromCharCode(b); 245 continue; 246 } else if (b > 0xBF && b <= 0xDF) { 247 c = b & 0x1F; 248 followingChars = 1; 249 } else if (b <= 0xEF) { 250 c = b & 0x0F; 251 followingChars = 2; 252 } else if (b <= 0xF7) { 253 c = b & 0x07; 254 followingChars = 3; 255 } else { 256 throw 'not a UTF-8 string'; 257 } 258 259 for (var j = 0; j < followingChars; ++j) { 260 b = bytes[i++]; 261 if (b < 0x80 || b > 0xBF) { 262 throw 'not a UTF-8 string'; 263 } 264 c <<= 6; 265 c += b & 0x3F; 266 } 267 if (c >= 0xD800 && c <= 0xDFFF) { 268 throw 'not a UTF-8 string'; 269 } 270 if (c > 0x10FFFF) { 271 throw 'not a UTF-8 string'; 272 } 273 274 if (c <= 0xFFFF) { 275 str += String.fromCharCode(c); 276 } else { 277 c -= 0x10000; 278 str += String.fromCharCode((c >> 10) + 0xD800); 279 str += String.fromCharCode((c & 0x3FF) + 0xDC00); 280 } 281 } 282 return str; 283 }; 284 } else { 285 utf8Base64Encode = function (str) { 286 var result = ''; 287 for (var i = 0; i < str.length; i++) { 288 var charcode = str.charCodeAt(i); 289 if (charcode < 0x80) { 290 result += String.fromCharCode(charcode); 291 } else if (charcode < 0x800) { 292 result += String.fromCharCode(0xc0 | (charcode >> 6)) + 293 String.fromCharCode(0x80 | (charcode & 0x3f)); 294 } else if (charcode < 0xd800 || charcode >= 0xe000) { 295 result += String.fromCharCode(0xe0 | (charcode >> 12)) + 296 String.fromCharCode(0x80 | ((charcode >> 6) & 0x3f)) + 297 String.fromCharCode(0x80 | (charcode & 0x3f)); 298 } else { 299 charcode = 0x10000 + (((charcode & 0x3ff) << 10) | (str.charCodeAt(++i) & 0x3ff)); 300 result += String.fromCharCode(0xf0 | (charcode >> 18)) + 301 String.fromCharCode(0x80 | ((charcode >> 12) & 0x3f)) + 302 String.fromCharCode(0x80 | ((charcode >> 6) & 0x3f)) + 303 String.fromCharCode(0x80 | (charcode & 0x3f)); 304 } 305 } 306 return btoa(result); 307 }; 308 309 utf8Base64Decode = function (base64Str) { 310 var tmpStr = atob(base64Str.trim('=').replace(/-/g, '+').replace(/_/g, '/')); 311 if (!/[^x00-x7F]/.test(tmpStr)) { 312 return tmpStr; 313 } 314 var str = '', i = 0, length = tmpStr.length, followingChars = 0, b, c; 315 while (i < length) { 316 b = tmpStr.charCodeAt(i++); 317 if (b <= 0x7F) { 318 str += String.fromCharCode(b); 319 continue; 320 } else if (b > 0xBF && b <= 0xDF) { 321 c = b & 0x1F; 322 followingChars = 1; 323 } else if (b <= 0xEF) { 324 c = b & 0x0F; 325 followingChars = 2; 326 } else if (b <= 0xF7) { 327 c = b & 0x07; 328 followingChars = 3; 329 } else { 330 throw 'not a UTF-8 string'; 331 } 332 333 for (var j = 0; j < followingChars; ++j) { 334 b = tmpStr.charCodeAt(i++); 335 if (b < 0x80 || b > 0xBF) { 336 throw 'not a UTF-8 string'; 337 } 338 c <<= 6; 339 c += b & 0x3F; 340 } 341 if (c >= 0xD800 && c <= 0xDFFF) { 342 throw 'not a UTF-8 string'; 343 } 344 if (c > 0x10FFFF) { 345 throw 'not a UTF-8 string'; 346 } 347 348 if (c <= 0xFFFF) { 349 str += String.fromCharCode(c); 350 } else { 351 c -= 0x10000; 352 str += String.fromCharCode((c >> 10) + 0xD800); 353 str += String.fromCharCode((c & 0x3FF) + 0xDC00); 354 } 355 } 356 return str; 357 }; 358 } 359 360 var encode = function (str, asciiOnly) { 361 var notString = typeof(str) != 'string'; 362 if (notString && str.constructor === root.ArrayBuffer) { 363 str = new Uint8Array(str); 364 } 365 if (notString) { 366 return encodeFromBytes(str); 367 } else { 368 if (!asciiOnly && /[^x00-x7F]/.test(str)) { 369 return utf8Base64Encode(str); 370 } else { 371 return btoa(str); 372 } 373 } 374 }; 375 376 var decode = function (base64Str, asciiOnly) { 377 return asciiOnly ? atob(base64Str) : utf8Base64Decode(base64Str); 378 }; 379 380 var exports = { 381 encode: encode, 382 decode: decode, 383 atob: atob, 384 btoa: btoa 385 }; 386 decode.bytes = decodeAsBytes; 387 decode.string = decode; 388 389 if (COMMON_JS) { 390 module.exports = exports; 391 } else { 392 root.base64 = exports; 393 if(AMD) { 394 define(function() { 395 return exports; 396 }); 397 } 398 } 399 })();