JavaScript

超轻量级php框架startmvc

Javascript实现base64的加密解密方法示例

更新时间:2020-05-20 15:48:01 作者:startmvc
这几天使用PHP向前端传值的时候,遇到一个问题,要将代码传过去赋值。如果使用urlencode()

这几天使用PHP向前端传值的时候,遇到一个问题,要将代码传过去赋值。如果使用urlencode()和urldecode()函数,就会出现js无法解码的情况,因为php和js的相关函数算法不一致。于是准备使用通用的base64加密解密。

base64 加密解密

下方是base64用javascript写出来的函数和方法。


//1.加密解密方法使用:
//1.加密 
var str = '124中文内容'; 
var base = new Base64(); 
var result = base.encode(str); 
//document.write(result); 
//2.解密 
var result2 = base.decode(result); 
document.write(result2); 
//2.加密、解密算法封装:
function Base64() { 
 // private property 
 _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="; 
 // public method for encoding 
 this.encode = function (input) { 
 var output = ""; 
 var chr1, chr2, chr3, enc1, enc2, enc3, enc4; 
 var i = 0; 
 input = _utf8_encode(input); 
 while (i < input.length) { 
 chr1 = input.charCodeAt(i++); 
 chr2 = input.charCodeAt(i++); 
 chr3 = input.charCodeAt(i++); 
 enc1 = chr1 >> 2; 
 enc2 = ((chr1 & 3) << 4) | (chr2 >> 4); 
 enc3 = ((chr2 & 15) << 2) | (chr3 >> 6); 
 enc4 = chr3 & 63; 
 if (isNaN(chr2)) { 
 enc3 = enc4 = 64; 
 } else if (isNaN(chr3)) { 
 enc4 = 64; 
 } 
 output = output + 
 _keyStr.charAt(enc1) + _keyStr.charAt(enc2) + 
 _keyStr.charAt(enc3) + _keyStr.charAt(enc4); 
 } 
 return output; 
 } 
 // public method for decoding 
 this.decode = function (input) { 
 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 = _keyStr.indexOf(input.charAt(i++)); 
 enc2 = _keyStr.indexOf(input.charAt(i++)); 
 enc3 = _keyStr.indexOf(input.charAt(i++)); 
 enc4 = _keyStr.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); 
 } 
 } 
 output = _utf8_decode(output); 
 return output; 
 } 
 // private method for UTF-8 encoding 
 _utf8_encode = function (string) { 
 string = string.replace(/\r\n/g,"\n"); 
 var utftext = ""; 
 for (var n = 0; n < string.length; n++) { 
 var c = string.charCodeAt(n); 
 if (c < 128) { 
 utftext += String.fromCharCode(c); 
 } else if((c > 127) && (c < 2048)) { 
 utftext += String.fromCharCode((c >> 6) | 192); 
 utftext += String.fromCharCode((c & 63) | 128); 
 } else { 
 utftext += String.fromCharCode((c >> 12) | 224); 
 utftext += String.fromCharCode(((c >> 6) & 63) | 128); 
 utftext += String.fromCharCode((c & 63) | 128); 
 } 
 } 
 return utftext; 
 } 
 // private method for UTF-8 decoding 
 _utf8_decode = function (utftext) { 
 var string = ""; 
 var i = 0; 
 var c = c1 = c2 = 0; 
 while ( i < utftext.length ) { 
 c = utftext.charCodeAt(i); 
 if (c < 128) { 
 string += String.fromCharCode(c); 
 i++; 
 } else if((c > 191) && (c < 224)) { 
 c2 = utftext.charCodeAt(i+1); 
 string += String.fromCharCode(((c & 31) << 6) | (c2 & 63)); 
 i += 2; 
 } else { 
 c2 = utftext.charCodeAt(i+1); 
 c3 = utftext.charCodeAt(i+2); 
 string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63)); 
 i += 3; 
 } 
 } 
 return string; 
 } 
}

以上所述是小编给大家介绍的Javascript实现base64的加密解密方法,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持!

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