JS生成UUID
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来源:http://www.cnblogs.com/greengnn/archive/2011/10/06/2199719.html
/*!
Math.uuid.js (v1.4)
http://www.broofa.com
mailto:robert@broofa.com
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);
});
};
})();
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