function sum(x, y) {
console.log(x + y);
}
setTimeout(sum, 1000, 1, 3);
定时器启动时候，第三个以后的参数是作为第一个func()的参数传进去。
var timeoutID;
function delayedAlert() {
timeoutID = window.setTimeout(window.alert, 2*1000, ‘That was really slow!‘);
}
function clearAlert() {
window.clearTimeout(timeoutID);
}
原文：https://www.cnblogs.com/vicky24k/p/11768319.html