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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£¬Í³Í³±ä³ÉÈ«¾Ö±äÁ¿
function test() {
return 1
+2
}
alert(test())
ÀàËÆµÄ»¹ÓУ¬ÓÉȺÀïµÄabcdÌṩ
function test() {
return 1
2
}
alert(test())
ÀàËÆµÄ»¹ÓУ¬ÓÉȺÀïµÄabcdÌṩ
function test() {
return
2
}
alert(test())
ÀàËÆµÄ»¹ÓУ¬ÓÉȺÀïµÄabcdÌṩ
function test() {
1
+2-
3
}
alert(test())
//¿¼²ìJavaScriptµÄEOS£¨·ÖºÅ£©ÎÊÌ⣬עÒâ²Ù×÷·ûÊÇ·ñ´æÔÚ
ÉÏÃæÕâÌâÒ²¿ÉÒÔÒý³öÕâôһÌ⣬ÓÉȺÀïµÄabcdÌṩ
function test() {
try {
return 1;
} finally {
return 2;
}
}
alert(test())
//Ò»¸öº¯ÊýÖ´ÐÐºó±Ø¶¨·µ»Ø£¨return£©Ò»¸ö½á¹û£¬Èç¹ûÔ­º¯ÊýÌåûÓÐreturnÓï¾ä±Ø·µ»Øundefined¡£
//Èç¹ûÀïÃæ´æÔÚÒì³£´¦Àí£¬finally¿éÖеÄreturn µÄÓÅÏȼ¶¸ßÓÚtry ¿éÖеÄreturn
alert(Number())
ÀàËÆµÄ»¹ÓУ¬ÓÉȺÀïµÄabcdÌṩ
alert(+" 3 ")
//²Î¼ûECMA3-5thµÄµÚ9.3½ÚÓë15.7.1½Ú¡£Èç¹ûNumber([value])µÄvalue²»´æÔÚ£¬Ôò·µ»Ø0
//Ò»¸ö×Ö·û´®±»Ö´ÐÐÁË¡°+¡±£¬¡°-¡±µÈ²Ù×÷£¬Ï൱ÓÚµ÷ÓÃÁËNumber(str)£¬ÕâʱÒ༴Ï൱ÓÚµ÷ÓÃÁËtoNumberº¯Êý
//ÕâÊÇÒ»¸öÄÚ½¨º¯Êý£¬Ö»´æÔÚÓÚJSÒýÇæÖУ¬¶ÔÓÚÕâ¸östrËü»áÖ´ÐÐtrim²Ù×÷£¬ÔÙÖ´ÐÐÊý×Öת»»£¬
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//Èç¹ûtrimºóµÃµ½µÄΪInfinity£¬ÔòÖ±½Óת»»Ëü£¬È磺
var a = +' Infinity ';
alert(typeof a) //number
//Èç¹û²»ÄÜת»»Ôò·µ»ØNaN
var add = function(el){
alert(el === el+1)
}
//ÇóelµÄÖµ£¬ÈÃel === el+1³ÉÁ¢£¡
//¿¼²ìjavascriptµÄÊýÖµ·¶Î§
add(Infinity)
add(Number.MAX_VALUE)
add(Number.POSITIVE_INFINITY)
add(Number.NEGATIVE_INFINITY)
alert([1,2,3,4,5][0..toString.length])
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JavaScript ´´½¨Àà/¶ÔÏóµÄ¼¸ÖÖ·½Ê½

ÔÚJSÖУ¬´´½¨¶ÔÏó£¨Create Object£©²¢²»ÍêÈ«ÊÇÎÒÃÇʱ³£ËµµÄ´´½¨Àà¶ÔÏó£¬JSÖеĶÔÏóÇ¿µ÷µÄÊÇÒ»ÖÖ¸´ºÏÀàÐÍ£¬JSÖд´½¨¶ÔÏó¼°¶Ô¶ÔÏóµÄ·ÃÎÊÊǼ«ÆäÁé»îµÄ¡£
JS¶ÔÏóÊÇÒ»ÖÖ¸´ºÏÀàÐÍ£¬ËüÔÊÐíÄãͨ¹ý±äÁ¿Ãû´æ´¢ºÍ·ÃÎÊ£¬»»Ò»ÖÖ˼·£¬¶ÔÏóÊÇÒ»¸öÎÞÐòµÄÊôÐÔ¼¯ºÏ£¬¼¯ºÏÖеÄÿһÏî¶¼ÓÉÃû³ÆºÍÖµ×é³É£¨ÌýÆðÀ´ÊDz»ÊǺÜÏñÎÒÃdz£Ìý˵µÄHASH±í¡¢× ......

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; ......

javascript³£ÓÃ

calcu()  ----º¯ÊýʵÏÖÁ½¸öÊýÏà³Ë
document.write();  ---´òÓ¡
document.calc.ÔªËØÃû.value;  --»ñµÃ±íµ¥µÄÖµ
document.±íµ¥Ãû¡£±íµ¥ÔªËØÃû¡£value  Ϊ±íµ¥¸³Öµ
¶¨Ò庯Êý£º
 function  Ãû×Ö()
 {
    //javaScriptÔ¤Óï¾ä
 }
 onClick="º¯ÊýÃû";  ......

javascript check all and uncheck

<script language='javascript'>
function toggleAll(cb)
{
    var val = cb.checked;
    var frm = document.forms[0];
    var len = frm.elements.length;
    var i=0;
    for( i=0 ; i<len ; i++)
  &nb ......

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 ......
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