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<!DOCTYPE html> <html> <body> <p>单击按钮显示时间。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function addZero(x,n) { while (x.toString().length < n) { x = "0" + x; } return x; } function myFunction() { var d = new Date(); var x = document.getElementById("demo"); var h = addZero(d.getHours(), 2); var m = addZero(d.getMinutes(), 2); var s = addZero(d.getSeconds(), 2); var ms = addZero(d.getMilliseconds(), 3); x.innerHTML = h + ":" + m + ":" + s + ":" + ms; } </script> </body> </html>