## 判断两个UUID 是否是同一个机器？

```/*!
Math.uuid.js (v1.4)
http://www.broofa.com
mailto:robert@broofa.com

*/

/*
* Generate a random uuid.
*
*   length - the desired number of characters
*   radix  - the number of allowable values for each character.
*
* EXAMPLES:
*   // No arguments  - returns RFC4122, version 4 ID
*   >>> Math.uuid()
*   "92329D39-6F5C-4520-ABFC-AAB64544E172"
*
*   // One argument - returns ID of the specified length
*   >>> Math.uuid(15)     // 15 character ID (default base=62)
*   "VcydxgltxrVZSTV"
*
*   // Two arguments - returns ID of the specified length, and radix. (Radix must be <= 62)
*   >>> Math.uuid(8, 2)  // 8 character ID (base=2)
*   "01001010"
*   >>> Math.uuid(8, 10) // 8 character ID (base=10)
*   "47473046"
*   >>> Math.uuid(8, 16) // 8 character ID (base=16)
*   "098F4D35"
*/
(function() {
// Private array of chars to use
var CHARS = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split('');

Math.uuid = function (len, radix) {
var chars = CHARS, uuid = [], i;

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('');
};

// A more performant, but slightly bulkier, RFC4122v4 solution.  We boost performance
// by minimizing calls to random()
Math.uuidFast = function() {
var chars = CHARS, uuid = new Array(36), rnd=0, r;
for (var i = 0; i < 36; i++) {
if (i==8 || i==13 ||  i==18 || i==23) {
uuid[i] = '-';
} else if (i==14) {
uuid[i] = '4';
} else {
if (rnd <= 0x02) rnd = 0x2000000 + (Math.random()*0x1000000)|0;
r = rnd & 0xf;
rnd = rnd >> 4;
uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r];
}
}
return uuid.join('');
};

// A more compact, but less performant, RFC4122v4 solution:
Math.uuidCompact = function() {
return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
var r = Math.random()*16|0, v = c == 'x' ? r : (r&0x3|0x8);
return v.toString(16);
});
};
})();
```

0