Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

Javascript±äÁ¿×÷ÓÃÓò

ÇëÏÈ¿´ÏÂÌ⣺
if(true)
{
     a = 1;
}
alert(a);  //Êä³öɶ£¿
if(true)
{
    var a = 1; 
}
alert(a);  //ÕâÓÖÊä³öʲô£¿
ÔÚfirefox3.5Ï£¬µÚÒ»¸öÊä³ö1;µÚ¶þ¸öÊä³öundefined£¡£¡£¡
ÎªÉ¶ÄØ£¿ºÇºÇ£¬±¾ÈËÔڴ˰àÃÅŪ¸«Ò»Ï£º
Ò»°ãÇé¿öÏÂȱʡvarÉùÃ÷ʱ£¬Ä¬ÈϸñäÁ¿ÎªÈ«¾Ö±äÁ¿¡£Á˽âÕâ¾ä»°£¬ËùÓÐÎÊÌâÒ²¾ÍÓ­Èжø½âÁË£¡ºÇºÇ£¡
µÚÒ»µÀÌ⣺±äÁ¿aȱʡvarÉùÃ÷£¬¶øÖ±½ÓʹÓ㬹ʶøÄ¬ÈÏΪȫ¾Ö±äÁ¿£¬Êä³ö1
µÚ¶þµÀÌ⣺±äÁ¿a£¬ÔÚif¿éÖÐvarÉùÃ÷£¬Êô¾Ö²¿±äÁ¿£¬Êä³öundefined£¡


Ïà¹ØÎĵµ£º

Javascriptµ¼³öExcel

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; ......

Javascript ¶ÔÏóµÄ±È½Ï

Õâ¸öËæ±ÊÆäʵÊÇΪÁ˸ÐлÇå·çЦ¸øµÄÒ»¸öÌáʾ£¬²»½ö½öÊǸæËßÎÒÔõôÅжÏÊý×飬¸üÈÃÎÒÓÐÁËÈÏÕæ¶ÁÒ»¶Á ¡¶javascriptȨÍþÖ¸ÄÏ¡·µÄÏë·¨¡£
±È½ÏºÍ¿½±´ÆäʵÊÇÒ»»ØÊ£¬´úÂëÈçÏ£º
//
//Compare object function
//
function Compare(fobj,sobj)
{
    var ftype = typ ......

JavaScript ¶¯Ì¬Êý×é ʵÀý


<html>
<body>
<script type="text/javascript">
//·½·¨Ò»
var num_arr= [];
for (var i = 0 ; i < 10 ;  i ++)
{
  num_arr[i] = i; 
}
document.write(num_arr+'</br>');
//·½·¨¶þ
var obj_arr=new Array();
obj_arr[6]='ss';
document.write(obj_arr.len ......

[·­Òë]High Performance JavaScript(005)

µÚ¶þÕ  Data Access  Êý¾Ý·ÃÎÊ
    One of the classic computer science problems is determining where data should be stored for optimal reading and writing. Where data is stored is related to how quickly it can be retrieved during code execution. This problem in JavaScri ......

һЩjavascriptÌâÄ¿

ȺÀïÌÖÂÛ¹ýµÄÌâÄ¿£¬·ÖÏíһϡ£
function test(){
var m=n=1;
alert(m);
}
alert(n);
//ÒòΪtestº¯ÊýûÓÐÖ´ÐУ¬³Ì¶È¿ØÖÆÁ÷²»ÄܽøÈë½øÐнâÎö£¬ÀïÃæµÄ¶«Î÷¶ÔÍâÃæ²»¿É¼û£¬Òò´Ë±¨´í
function test(){
var m=n=1;
alert(m);
}
test();
alert(n);
//µ±testÖ´Ðкó£¬Í ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ