JS生成uuid

网上淘来的js生成uuid的例子。收藏了。
<html>
	<head>
		<script type="text/javascript">
			/*!
			Math.uuid.js (v1.4)
			http://www.broofa.com
			mailto:[email protected]
			 
			Copyright (c) 2010 Robert Kieffer
			Dual licensed under the MIT and GPL licenses.
			*/
			 
			/*
			 * Generate a random uuid.
			 *
			 * USAGE: Math.uuid(length, radix)
			 *   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;
				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('');
			  };
			 
			  // 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);
				});
			  };
			})();

			window.onload=function(){
				alert(Math.uuid());
			}

		</script>
	</head>
	<body>
		<h1>产生uuid!</h1>
	</body>
</html>

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