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

ÕÅТÏêjavascript½²×ù±Ê¼ÇËÄ

Ò»£¬È«¾Ö±äÁ¿ºÍ¾Ö²¿±äÁ¿µÄ±È½Ï
    <script type="text/javascript">
<!--
var msg = 'È«¾Ö±äÁ¿';
function show()
{
msg = '¾Ö²¿±äÁ¿'; //ÐÞ¸ÄÈ«¾Ö±äÁ¿µÄÖµ
}
show();
alert(msg); //´ËʱµÄֵΪ‘¾Ö²¿±äÁ¿’
//-->
</script> <script type="text/javascript">
<!--
var msg = 'È«¾Ö±äÁ¿';
function show()
{
var msg;
msg = '¾Ö²¿±äÁ¿'; //Ö»Ð޸ľֲ¿±äÁ¿µÄÖµ
}
show();
alert(msg); //´ËʱµÄֵΪ‘¾Ö²¿±äÁ¿’
//-->
</script>
¶þ£¬javascriptÖвÎÊý¸öÊý¿É±äµÄº¯Êý
  ÔÚº¯ÊýÄÚ²¿Ê¹ÓÃarguments¶ÔÏóÀ´·ÃÎʵ÷ÓóÌÐò´«µÝµÄËùÓвÎÊý£¬¶øÔÚº¯ÊýµÄÉùÃ÷Öк¯Êý²ÎÊýÁбíΪ¿Õ¼´¿É
  eg:
  <script type="text/javascript">
<!--
function textparams()
{
var params = '';
//ÔÚº¯ÊýÄÚ²¿Ê¹ÓÃarguments¶ÔÏóÀ´·ÃÎʵ÷ÓóÌÐò´«µÝµÄËùÓвÎÊý
for(var i=0;i<arguments.length;i++)
{
params = params + '' + arguments[i];
}
textparams('abc',123);
textparams(123,456,'abc');
}
// -->
</script>
Èý£¬´´½¨¶¯Ì¬º¯Êý£¨ÔÚc/c++ÖÐÀûÓú¯ÊýÖ¸ÕëÀ´ÊµÏÖ£©
  var varName = new Function(argument1,...,lastargument);
  ˵Ã÷£º
  ËùÓеIJÎÊý¶¼±ØÐëÊÇ×Ö·û´®ÀàÐ͵ģ¬×îºóµÄÒ»¸ö²ÎÊý±ØÐëÊÇÕâ¸ö¶¯Ì¬º¯ÊýµÄ¹¦ÄܳÌÐò´úÂë¡£
 
  eg:
 <script type="text/javascript">
<!--
var square = new Function('x','y','var sum,sum=x*x+y*y;return sum;');
alert(square(2,3));
// -->
</script>
 ¶¯Ì¬º¯ÊýÓÐʲôÓã¿
 ¿ÉÒÔÔÚ³ÌÐòÖ´Ðйý³ÌÖУ¬¶¯Ì¬±ä»»º¯ÊýµÄº¯Êý´úÂ룻
ËÄ£¬javascriptµÄϵͳº¯Êý(¿ÉÒÔÖ±½Óµ÷ÓÃ)
1£¬encodeURI·½·¨
     ·µ»Ø¶ÔÒ»¸öURI×Ö·û´®±àÂëÖеĽá¹û£¬±¾ÖÊÊÇUTF-8±àÂë
     eg:
     var urlStr = encodeURI('http://fanli.qq.com/index.html?a=ddd&msg=Öйú');
     alert(urlStr);
2, decodeURI·½·¨
    ¶ÔURI±àÂë½øÐнâÂë³Â×î³õʼµÄ×Ö·û´®²¢·µ»Ø
3£¬parseInt·½·¨
    ½«Ò»¸ö×Ö·û´®°´Ö¸¶¨µÄ½øÖÆ×ª»»³ÉÒ»¸öÕûÊý
    parseInt(numString, [rad


Ïà¹ØÎĵµ£º

javascriptÖеÄdefer

ÔÚʹÓÃgetElementByIdʱÓÖÓöµ½ÁË“document.getElementById('...')Ϊ¿Õ»ò²»ÊÇ·½·¨”µÄ´íÎó£¬alert()ÁËһϷ¢ÏÖ»ñÈ¡µÄֵΪnull£¬ÓÚÊÇÕÒÁ˰ëÌìËÑË÷µ½ÁËÕâ¸öÕâ¸ödefer¡£
ÔÚjavascript±êÇ©ÖмÓÉÏ defer µÈÓÚÔÚÒ³ÃæÍêÈ«ÔÚÈëºóÔÙÖ´ÐУ¬Ï൱ÓÚ window.onload £¬µ«Ó¦ÓÃÉϱȠwindow.onload  ......

[Javascript]typeofº¯ÊýÓëconstructorÊôÐÔ

½ñÌìżȻ¿´µ½ÁËconstructorÕâ¸ö¶«¶«£¬²»Ã÷°×ÓÃ;¡£Õҵ㶫Î÷±¸Íü
typeofº¯ÊýµÄÓ÷¨¿ÉÄܲ»ÓÃÎÒ¶à˵£¬´ó¼Ò¶¼ÖªµÀÔõôÓ᣶øconstructorÊôÐÔ´ó¼Ò¿ÉÄܾÍİÉúµã¡£ÔÚ¡¶¾«Í¨JavaScript¡·Õâ±¾ÊéÖÐÓÐÌáµ½constructµÄÓ÷¨£¬µ«ÎÒÓÃ×Ô¼ºµÄ¼¸¸öä¯ÀÀÆ÷£¨IE7.0 / Firefox1.9 / Opera9.50£©²âÊԵĽá¹ûÈ´ºÍÊéÉÏ˵µÄ²»Ò»Ñù¡£µ«ÊÇÈÔÈ»ÊÇÓÐ°ì·¨Í ......

JavascriptÖÐ×î³£ÓõÄ55¸ö¾­µä¼¼ÇÉ

¡¾Ç°ÑÔ¡¿ºÃÎÄÕ£¬¾ÍÊÇÒªÂýÂýÑо¿£¬ËùÒÔÏÈת¹ýÀ´´æ×Å~
1. oncontextmenu="window.event.returnValue=false" ½«³¹µ×ÆÁ±ÎÊó±êÓÒ¼ü
<table border oncontextmenu=return(false)><td>no</table> ¿ÉÓÃÓÚTable
2. <body onselectstart="return false"> È¡Ïûѡȡ¡¢·ÀÖ¹¸´ÖÆ
3. onpaste="return false" ......

[ת]JavaScriptºÍJavaµÄÇø±ð

JavaScriptºÍJavaµÄÇø±ð
¡¡¡¡ËäÈ»JavaScriptÓëJavaÓнôÃܵÄÁªÏµ£¬µ«È´ÊÇÁ½¸ö¹«Ë¾¿ª·¢µÄ²»Í¬µÄÁ½¸ö²úÆ·¡£JavaÊÇSUN¹«Ë¾ÍƳöµÄÐÂÒ»´úÃæÏò¶ÔÏóµÄ³ÌÐòÉè¼ÆÓïÑÔ£¬ÌرðÊʺÏÓÚInternetÓ¦ÓóÌÐò¿ª·¢£»¶øJavaScriptÊÇNetscape¹«Ë¾µÄ²úÆ·£¬ÆäÄ¿µÄÊÇΪÁËÀ©Õ¹Netscape Navigator¹¦ÄÜ,¶ø¿ª·¢µÄÒ»ÖÖ¿ÉÒÔǶÈëWebÒ³ÃæÖеĻùÓÚ¶ÔÏóºÍʼþÇý¶ ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ