php的base64加密及解密有两个很好用的内置函数base64_encode()和base64_decode(),那么用javascript如何是实现,具体的代码如下:
var Base64 = {_keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=", encode: function(e) {var t = "";var n, r, i, s, o, u, a;var f = 0;e = Base64._utf8_encode(e);while (f < e.length) {n = e.charCodeAt(f++);r = e.charCodeAt(f++);i = e.charCodeAt(f++);s = n >> 2;o = (n & 3) << 4 | r >> 4;u = (r & 15) << 2 | i >> 6;a = i & 63;if (isNaN(r)) {u = a = 64} else if (isNaN(i)) {a = 64}t = t + this._keyStr.charAt(s) + this._keyStr.charAt(o) + this._keyStr.charAt(u) + this._keyStr.charAt(a)}return t}, decode: function(e) {var t = "";var n, r, i;var s, o, u, a;var f = 0;e = e.replace(/[^A-Za-z0-9+/=]/g, "");while (f < e.length) {s = this._keyStr.indexOf(e.charAt(f++));o = this._keyStr.indexOf(e.charAt(f++));u = this._keyStr.indexOf(e.charAt(f++));a = this._keyStr.indexOf(e.charAt(f++));n = s << 2 | o >> 4;r = (o & 15) << 4 | u >> 2;i = (u & 3) << 6 | a;t = t + String.fromCharCode(n);if (u != 64) {t = t + String.fromCharCode(r)}if (a != 64) {t = t + String.fromCharCode(i)}}t = Base64._utf8_decode(t);return t}, _utf8_encode: function(e) {e = e.replace(/rn/g, "n");var t = "";for (var n = 0; n < e.length; n++) {var r = e.charCodeAt(n);if (r < 128) {t += String.fromCharCode(r)} else if (r > 127 && r < 2048) {t += String.fromCharCode(r >> 6 | 192);t += String.fromCharCode(r & 63 | 128)} else {t += String.fromCharCode(r >> 12 | 224);t += String.fromCharCode(r >> 6 & 63 | 128);t += String.fromCharCode(r & 63 | 128)}}return t}, _utf8_decode: function(e) {var t = "";var n = 0;var r = c1 = c2 = 0;while (n < e.length) {r = e.charCodeAt(n);if (r < 128) {t += String.fromCharCode(r);n++} else if (r > 191 && r < 224) {c2 = e.charCodeAt(n + 1);t += String.fromCharCode((r & 31) << 6 | c2 & 63);n += 2} else {c2 = e.charCodeAt(n + 1);c3 = e.charCodeAt(n + 2);t += String.fromCharCode((r & 15) << 12 | (c2 & 63) << 6 | c3 & 63);n += 3}}return t}
};
看到源码大家可能有点不明白,这要怎么样用呢?很简单使用方法如下:
var secret = Base64.encode('需要加密的内容');