使用以下代码
function clock(){
/*var message = document.getElementById("timer");
message.innerHTML = "The time is " + Date();
*/
var msec = 00;
var sec = 00;
var min = 00;
msec += 1;
console.log(min + ":" + sec + ":" + msec);
if (msec == 60) {
sec += 1;
msec = 00;
console.log(min + ":" + sec + ":" + msec);
if (sec == 60) {
sec = 00;
min += 1;
console.log(min + ":" + sec + ":" + msec); …Run Code Online (Sandbox Code Playgroud)