js生成UUID算法

/**
 * 生成UUID
 * @param len 长度
 * @param radix 基数 2进制 8进制 10进制 16进制
 * @returns uuid
 * 调用：var uuidstr = uuid(32,16);//生成32位长度的基数为16进制的uuid
 *  7FEA14A4722E273EE28C3F72E9E9141F
 */
 
 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('');
 }

//测试
$(document).ready(function(){
	console.log(uuid(32,2))
	console.log(uuid(32,8))
	console.log(uuid(32,10))
	console.log(uuid(32,16))
});
//输出结果：
01011101010010111011000110000001
60100622612175075565721144010052
17508391034601390293307998456115
7FEA14A4722E273EE28C3F72E9E9141F