Javascript生成全局唯一标识符(GUID,UUID)的方法
方法一
function guid() { 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); }); }
方法二
function guid() { function S4() { return (((1+Math.random())*0x10000)|0).toString(16).substring(1); } return (S4()+S4()+"-"+S4()+"-"+S4()+"-"+S4()+"-"+S4()+S4()+S4()); }
方法三
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(''); }
这个可以指定长度和基数。比如
// 8 character ID (base=2) uuid(8, 2) // "01001010" // 8 character ID (base=10) uuid(8, 10) // "47473046" // 8 character ID (base=16) uuid(8, 16) // "098F4D35"
方法四
function uuid() { var s = []; var hexDigits = "0123456789abcdef"; for (var i = 0; i < 36; i++) { s[i] = hexDigits.substr(Math.floor(Math.random() * 0x10), 1); } s[14] = "4"; // bits 12-15 of the time_hi_and_version field to 0010 s[19] = hexDigits.substr((s[19] & 0x3) | 0x8, 1); // bits 6-7 of the clock_seq_hi_and_reserved to 01 s[8] = s[13] = s[18] = s[23] = "-"; var uuid = s.join(""); return uuid; }
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posted on 2017-01-04 16:11 龙行龘龘9527 阅读(50377) 评论(4) 编辑 收藏 举报