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t 参数生成js

for (var i, s = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_".split(""), a = 64, c = {}, p = 0, u = 0; u < a; u++)
            c[s[u]] = u;


function n(t) {
            var e = "";
            do
                e = s[t % a] + e,
                t = Math.floor(t / a);
            while (t > 0);return e
        }

function o() {
            var t = n(+new Date);
            return t !== i ? (p = 0,
            i = t) : t + "." + n(p++)
        }

console.log(o())