解决setTimeout 计时器重复调用的问题

var stime = 16,
t;

function fntime() {
stime--;
t = setTimeout(fntime, 1000);
if (stime < 0) {
clearTimeout(t);
return;
}

console.log(stime);
}

var timer = function() {
try {
if (t._idleTimeout < 0) {
fntime();
console.log(1);
}
console.log(2);
} catch (e) {
fntime();
console.log(3);
}

}

timer();
timer();

console.log(t);
console.log(t._idleTimeout);
clearTimeout(t);
console.log(t);
console.log(t._idleTimeout);

timer();
timer();