javascript±ä»¯µÄʱÖÓ
<script language="JavaScript">
<!--
function check(val){
if (val<10){
return("0"+val);
}else{
return(val);
}
}
function ShowTime()
{
var date=new Date();
var year=date.getFullYear();
var month=date.getMonth()+1;
var day=date.getDate();
var hour=date.getHours();
var minutes=date.getMinutes();
var second=date.getSeconds();
var timestr=year+"-"+ month+"-"+ day+ " " + +check(hour)+":"+check(minutes)+":"+check(second);
document.getElementById("stime").innerText=timestr;
var timerID=setTimeout('ShowTime();',1000);
}
//-->
</script>
Ïà¹ØÎĵµ£º
Ò»¡¢ÑéÖ¤Àà
1¡¢Êý×ÖÑéÖ¤ÄÚ
1.1 ÕûÊý
/^(-|\+)?\d+$/¡¡¡¡²»¿ÉÒÔΪ¿Õ
/^[-+]?\d*$/ ¿ÉÒÔΪ¿Õ
1.2 ´óÓÚ0µÄÕûÊý £¨ÓÃÓÚ´«À´µÄIDµÄÑéÖ¤)
/^\d+$/
1.3 ¸ºÕûÊýµÄÑéÖ¤
/^-\d+$/
1.4 ÕûÊý²»ÄÜ´óÓÚiMax
¸ù¾ÝÉÏÃæµÄÕýÔò¿ÉÒÔд³ö¡£
1.5 ÕûÊý²»ÄÜÐ¡Ó ......
Òý×Ó
±à³ÌÊÀ½çÀïÖ»´æÔÚÁ½ÖÖ»ù±¾ÔªËØ£¬Ò»¸öÊÇÊý¾Ý£¬Ò»¸öÊÇ´úÂë¡£±à³ÌÊÀ½ç¾ÍÊÇÔÚÊý¾ÝºÍ´úÂëǧ˿ÍòÂÆµÄ¾À²øÖгÊÏÖ³öÎÞÏÞµÄÉú»úºÍ»îÁ¦¡£
Êý¾ÝÌìÉú¾ÍÊÇÎľ²µÄ£¬×ÜÏë±£³Ö×Ô¼º¹ÌÓеı¾É«£»¶ø´úÂëÈ´ÌìÉú»îÆÃ£¬×ÜÏë¸Ä±äÕâ¸öÊÀ½ç¡£
Äã¿´£¬Êý¾Ý´úÂë¼äµÄ¹ØÏµÓëÎïÖÊÄÜÁ¿¼äµÄ¹Ø ......
Ò» Undefined ÀàÐÍ
Ö»ÓÐÒ»ÖÖÖµ undefined
ÒÔÏÂÈýÖÖÇé¿ötypeof ·µ»ØÀàÐÍΪundefined
1. µ±±äÁ¿Î´³õʼ»¯Ê±
2. ±äÁ¿Î´¶¨Òåʱ
3. º¯ÊýÎÞÃ÷È··µ»ØÖµÊ±£¨º¯ÊýûÓзµ»ØÖµÊ±·µ»ØµÄ¶¼ÊÇundefined£©
undefined ²¢²»µÈͬÓÚ䶨ÒåµÄÖµ
typeof ²¢²»ÕæÕýÇø·ÖÊÇ·ñÊÇ䶨Òå
¿´ÒÔÏÂʾÀý´úÂ룺
var oTemp;
alert(typeof o ......
43¡¢JavaScriptÖ÷Ò³µ¯³ö´°¿Ú¼¼ÇÉ
´°¿ÚÖм䵯³ö
<script>
window.open("http://www.cctv.com","","width=400,height=240,top="+(screen.availHeight-240)/2+",left="+(screen.availWidth-400)/2);
</script>
============
<html>
<head>
<script language="LiveScript">
fu ......
¶ÔObjectµÄextendÊÇÒ»¸ö³£ÓõŦÄÜ¡£¾ÙÒ»¸öÀý×Ó£¬ÓÉÓÚjavascript ûÓÐÖØÔØ£¨overload£©£¬¶øÇÒº¯ÊýµÄ²ÎÊýÀàÐÍÊÇûÓж¨ÒåµÄ£¬ËùÒԺܶàʱºòÎÒÃǶ¼´«ÈëÒ»¸ö¶ÔÏóÀ´×÷Ϊ²ÎÊýÒÑ·½±ã¿ØÖÆ¡£Í¨³£ÔÚº¯ÊýÀïÃæ¸øÁ˲ÎÊý¶ÔÏóµÄĬÈÏÖµ£¬Õâ¸öʱºò¾ÍÐèҪͨ¹ýextendÀ´°Ñ´«ÈëµÄ²ÎÊý¸²¸Ç½øÄ¬ÈϲÎÊý,È磺
´úÂë:
1. gia ......