/*!
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('');
 };

 Math.uuid

 // 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);
 });
 };

 //Number 四舍五入
 // 避免跟Math.round重复和覆盖
 Math.rounding = function (input, radix) {
 if(radix < 0 || radix > 100) return input;
 if(+input === +input){
 radix = parseInt(radix);
 var base = 1;
 while(radix){
 base *= 10;
 radix --;
 }
 return Math.round(input * base) / base;
 }else{
 return input;
 }
 }

})();