alert ( "text") alert box
confirm ( "Text") to confirm the box click OK return true, otherwise return false
prompt ( "Text", "default value") prompt box

JS events
onload onOnload

onFocus onBlur and onchange

onSubmit

onMouseOver onMouseOut

Paste顺带着electronic table js code
<html>
<head>
<script type="text/javascript">
function startTime ()
(
var today = new Date ()
var h = today.getHours ()
var m = today.getMinutes ()
var s = today.getSeconds ()
/ / Add a zero in front of numbers <10
m = checkTime (m)
s = checkTime (s)
document.getElementById ( 'txt'). innerHTML = h +":"+ m +":"+ s
t = setTimeout ( 'startTime ()', 500)
)

function checkTime (i)
(
if (i <10)
(i = "0" + i)
return i
)
</ script>
</ head>

<body onload="startTime()">
<div> </ div>
</ body>
</ html>