怎样用Javascript实现Base64的编码解码? 很多代碼都有這個問題﹐幫頂 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 try<script language=javascript>var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";var 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);function base64encode(str) {var out, i, len;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;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:// 0xxxxxxxout += str.charAt(i-1);break;case 12: case 13:// 110x xxxx 10xx xxxxchar2 = str.charCodeAt(i++);out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));break;case 14:// 1110 xxxx 10xx xxxx 10xx xxxxchar2 = str.charCodeAt(i++);char3 = str.charCodeAt(i++);out += String.fromCharCode(((c & 0x0F) << 12) |((char2 & 0x3F) << 6) |((char3 & 0x3F) << 0));break;}}return out;}function doit() {var f = document.ff.output.value = base64encode(utf16to8(f.source.value))f.decode.value = utf8to16(base64decode(f.output.value))}</script><H1>Base64</H1><FORM NAME="f">原码<BR><TEXTAREA NAME="source" ROWS=4 COLS=60 WRAP="soft"></TEXTAREA><BR><BR>Base64 encode<BR><TEXTAREA NAME="output" ROWS=4 COLS=60 WRAP="soft"></TEXTAREA><BR><BR>Base64 decode<BR><TEXTAREA NAME="decode" ROWS=4 COLS=60 WRAP="soft"></TEXTAREA><BR><BR><INPUT TYPE=BUTTON VALUE="转换" ONCLICK="doit()"></FORM> 图片上移 求助,Extjs 分页不准确 js模态窗口 刷新父页面(求救大侠) 系统支持中文和英文版本的,当用户选择英文版怎么样把"加载中..."改成"Loading..." 像试衣间这种网页怎么写 高分问 ExtJs 附值问题.. 当鼠标点击表格外, 表格的背景颜色变成白色 ArcGIS Javascript 实现JS堆栈的问题 求科普求赐教!!!像美团外卖这种app是怎么根据用户输入的食物中自动匹配最近的商家地址的?有什么自动匹配的算法吗?还是百度地图api自动定位的?? 用javascript循环显示图片 急救,对超级连接如何确认???
var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var 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);function base64encode(str) {
var out, i, len;
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;
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;
}
function doit() {
var f = document.f
f.output.value = base64encode(utf16to8(f.source.value))
f.decode.value = utf8to16(base64decode(f.output.value))
}
</script>
<H1>Base64</H1>
<FORM NAME="f">
原码<BR>
<TEXTAREA NAME="source" ROWS=4 COLS=60 WRAP="soft"></TEXTAREA><BR><BR>
Base64 encode<BR>
<TEXTAREA NAME="output" ROWS=4 COLS=60 WRAP="soft"></TEXTAREA><BR><BR>
Base64 decode<BR>
<TEXTAREA NAME="decode" ROWS=4 COLS=60 WRAP="soft"></TEXTAREA><BR><BR>
<INPUT TYPE=BUTTON VALUE="转换" ONCLICK="doit()">
</FORM>