程序传参的过程中对参数的处理常见的有 urlencode rawurlencode 等等这些函数,但在实际操作中作者发现这些函数处理起来总是会出些问题,最常见的urlencode在网页一连串的跳转过程中传参对&这个符号总是处理的有问题。经试验,作者发现还是使用base64_encode加密然后传参来的靠谱。
在php中对字符串进行base64_encode加密处理很容易,而且有相应的base64_decode函数进行解密,在js中却没有响应的处理方法,下面就和大家分享一个在js中实现php语言中的base64_encode base64_decode的方法。
function base64encode(str){ var out,i,len,base64EncodeChars="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; 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 base64decode(str){ var c1,c2,c3,c4,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); 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; }
代码摘抄自网上,但做了些改进,网上流传的一些代码声明了两个比较大的全局变量,相对起来来说对性能有一些影响。
javascript实现base64_encode加密,解密的函数压缩下载
代码实例参照:base64编码加密,解密