一个精确到毫秒的时钟

练习一下

 

function mytimer(){
                var d = new Date();
                var h = d.getHours();
                var m = d.getMinutes();
                var s = d.getSeconds();
                var ms = String(d.getMilliseconds()).charAt(0);
                
                h = (h < 10)?("0"+h) : h;
                m = (m < 10)?("0"+m) : m;
                s = (s < 10)?("0"+s) : s;
                
                window.document.getElementById('timer').innerHTML = h+":"+m +":"+ s + "." + ms;
                
                setTimeout("mytimer()",100);
            }
            mytimer();