JS - 產生UUID

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function uuid(len, radix) {  var chars = ‘0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz‘.split(‘‘);  var uuid = [], i;  radix = radix || chars.length;   if (len) {   // Compact form   for (i = 0; i < len; i++) uuid[i] = chars[0 | Math.random()*radix];  } else {   // rfc4122, version 4 form   var r;    // rfc4122 requires these characters   uuid[8] = uuid[13] = uuid[18] = uuid[23] = ‘-‘;   uuid[14] = ‘4‘;    // Fill in random data. At i==19 set the high bits of clock sequence as   // per rfc4122, sec. 4.1.5   for (i = 0; i < 36; i++) {    if (!uuid[i]) {     r = 0 | Math.random()*16;     uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r];    }   }  }   return uuid.join(‘‘);}

這個可以指定長度和基數。比如：

// 8 character ID (base=2)uuid(8, 2) // "01001010"// 8 character ID (base=10)uuid(8, 10) // "47473046"// 8 character ID (base=16)uuid(8, 16) // "098F4D35"

 

JS - 產生UUID