使用JS生成唯一识别码(GUID)

<script type="text/javascript">
var uuid = (function() { var a = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz".split(""); return function(b, f) { var h = a, e = [], d = Math.random; f = f || h.length; if (b) { for (var c = 0; c < b; c++) { e[c] = h[0 | d() * f]; } } else { var g; e[8] = e[13] = e[18] = e[23] = "-"; e[14] = "4"; for (var c = 0; c < 36; c++) { if (!e[c]) { g = 0 | d() * 16; e[c] = h[(c == 19) ? (g & 3) | 8 : g & 15]; } } } return e.join("").toLowerCase(); }; })();
document.write(uuid());
</script>