最近制作静态模板的时要用JavaScript来读取Cookie，MSDN上给出了下面这个函数：
// Retrieve the value of the cookie with the specified name.function GetCookie(sName){// cookies are separated by semicolonsvar aCookie = document.cookie.split("; ");for (var i=0; i < aCookie.length; i++){// a name alue pair (a crumb) is separated by an equal signvar aCrumb = aCookie[i].split("=");if (sName == aCrumb[0]){return aCrumb[1];}}// a cookie with the requested name does not existreturn null;}需要注意的是JS里面用document.cookie来读取到的COOKIE是把当前域中所有COOKIE用"= "(等号与空格)连接起来，所以split的时候千万不要忘记中间的空格！
另外由于COOKIE是经过BASE64编码的，又找到这段针对UTF8编码的base64decode函数：
function decode64(input) {var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";var output = "";var chr1, chr2, chr3;var enc1, enc2, enc3, enc4;var i = 0;// remove all characters that are not A-Z, a-z, 0-9, +, /, or =input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");flag = 0; // flag of Bytes follows.ucs2_code = 0;do {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;if ( chr1 <= 0x80) {// 单字节ASCII，直接输出ucs2_code = chr1;} else if (chr1 <= 0xC0) {// 非独立字节 --flag;if (flag ==1){ucs2_code += ( chr1-0x80 ) << 6;}else {ucs2_code += chr1-0x80;}} else if (chr1 <= 0xE0){// 双字节utf-8编码flag = 1;ucs2_code = ( chr1-0xC0 ) << 6;} else if (chr1 <=0xF0){// 三字节utf-8编码flag = 2;ucs2_code = ( chr1-0xE0 ) << 12;}if (flag == 0){output = output + String.fromCharCode(ucs2_code);}if (enc3 != 64) {if ( chr2 <= 0x80) {ucs2_code = chr2;} else if (chr2 <= 0xC0){--flag;if (flag == 1){ucs2_code += ( chr2-0x80 ) << 6;}else {ucs2_code += chr2-0x80;}} else if (chr2 <= 0xE0){flag = 1;ucs2_code = ( chr2-0xC0 ) << 6;} else if (chr2 <=0xF0){flag = 2;ucs2_code = ( chr2-0xE0 ) << 12;}if (flag == 0){output = output + String.fromCharCode(ucs2_code);}}if (enc4 != 64) {if ( chr3 <= 0x80) {ucs2_code = chr3;} else if (chr3 <= 0xC0){--flag;if (flag==1){ucs2_code += ( chr3-0x80 ) << 6;}else {ucs2_code += chr3-0x80;}} else if (chr3 <= 0xE0){flag = 1;ucs2_code = ( chr3-0xC0 ) << 6;} else if (chr3 <=0xF0){flag = 2;ucs2_code = ( chr3-0xE0 ) << 12;}if (flag == 0){output = output + String.fromCharCode(ucs2_code);}}} while (i < input.length);return output;}from:http://www.leexuan.com/2006/05/javascript_cookie.html