var w1Date, w2Date;
function w1() {
w1Date = Date.now()
}
function w2() {
w2Date = Date.now()
console.log(' time.sp: ', w2Date - w1Date, ' ms')
}
setTimeout(w1, 100)
setTimeout(w2, 500)
function timeLoop(k) {
var now = Date.now()
while (Date.now() - now < k) {
// console.log(k)
}
}
timeLoop(500)