javascript根据时间生成m位随机数最大13位

function ran(m) {
m = m > 13 "htmlcode">

function rand(m) {
m = m > 16 "htmlcode">

function rando(m) {
var num = '';
for(var i = 0; i < m; i++) {
var val = parseInt(Math.random()*10, 10);
if(i === 0 && val === 0) {
i--;
continue;
}
num += val;
}
return num;
}
console.log(rando(5));