JavaScriptÀàÐÍת»»
·½·¨Ö÷ÒªÓÐÈýÖÖ
ת»»º¯Êý¡¢Ç¿ÖÆÀàÐÍת»»¡¢ÀûÓÃjs±äÁ¿ÈõÀàÐÍת»»¡£
1. ת»»º¯Êý
jsÌṩÁËparseInt()ºÍparseFloat()Á½¸öת»»º¯Êý¡£Ç°Õß°Ñֵת»»³ÉÕûÊý£¬ºóÕß°Ñֵת»»³É¸¡µãÊý¡£Ö»ÓжÔStringÀàÐ͵÷ÓÃÕâЩ·½·¨£¬ÕâÁ½¸öº¯Êý²ÅÄÜÕýÈ·ÔËÐУ»¶ÔÆäËûÀàÐÍ·µ»ØµÄ¶¼ÊÇNaN(Not a Number)¡£
ÔÚÅжÏ×Ö·û´®ÊÇ·ñÊÇÊý×Öֵǰ£¬parseInt()ºÍparseFloat()¶¼»á×Ðϸ·ÖÎö¸Ã×Ö·û´®¡£parseInt()·½·¨Ê×ÏȲ鿴λÖÃ0´¦µÄ×Ö·û£¬ÅжÏËüÊÇ·ñÊǸöÓÐЧÊý×Ö£»Èç¹û²»ÊÇ£¬¸Ã·½·¨½«·µ»ØNaN£¬²»ÔÙ¼ÌÐøÖ´ÐÐÆäËû²Ù×÷¡£µ«Èç¹û¸Ã×Ö·ûÊÇÓÐЧÊý×Ö£¬¸Ã·½·¨½«²é¿´Î»ÖÃ1´¦µÄ×Ö·û£¬½øÐÐͬÑùµÄ²âÊÔ¡£ÕâÒ»¹ý³Ì½«³ÖÐøµ½·¢ÏÖ·ÇÓÐЧÊý×ÖµÄ×Ö·ûΪֹ£¬´ËʱparseInt()½«°Ñ¸Ã×Ö·û֮ǰµÄ×Ö·û´®×ª»»³ÉÊý×Ö¡£
ÀýÈ磬Èç¹ûÒª°Ñ×Ö·û´® "1234blue "ת»»³ÉÕûÊý£¬ÄÇôparseInt()½«·µ»Ø1234£¬ÒòΪµ±Ëü¼ì²âµ½×Ö·ûbʱ£¬¾Í»áÍ£Ö¹¼ì²â¹ý³Ì¡£×Ö·û´®Öаüº¬µÄÊý×Ö×ÖÃæÁ¿»á±»Õýȷת»»ÎªÊý×Ö£¬Òò´Ë×Ö·û´® "0xA "»á±»Õýȷת»»ÎªÊý×Ö10¡£²»¹ý£¬×Ö·û´® "22.5 "½«±»×ª»»³É22£¬ÒòΪ¶ÔÓÚÕûÊýÀ´Ëµ£¬Ð¡ÊýµãÊÇÎÞЧ×Ö·û¡£Ò»Ð©Ê¾ÀýÈçÏ£º
parseInt("1234blue"); //returns 1234
parseInt("0xA"); //returns 10
parseInt("22.5"); //returns 22
parseInt("blue"); //returns NaN
parseInt()·½·¨»¹Óлùģʽ£¬¿ÉÒ԰Ѷþ½øÖÆ¡¢°Ë½øÖÆ¡¢Ê®Áù½øÖÆ»òÆäËûÈκνøÖƵÄ×Ö·û´®×ª»»³ÉÕûÊý¡£»ùÊÇÓÉparseInt()·½·¨µÄµÚ¶þ¸ö²ÎÊýÖ¸¶¨µÄ£¬ËùÒÔÒª½âÎöÊ®Áù½øÖƵÄÖµ£¬ÐèÈçϵ÷ÓÃparseInt()·½·¨£º
parseInt("AF", 16); //returns 175
µ±È»£¬¶Ô¶þ½øÖÆ¡¢°Ë½øÖÆ£¬ÉõÖÁÊ®½øÖÆ£¨Ä¬ÈÏģʽ£©£¬¶¼¿ÉÒÔÕâÑùµ÷ÓÃparseInt()·½·¨£º
parseInt("10", 2); //returns 2
parseInt("10", 8); //returns 8
parseInt("10", 10); //returns 10
Èç¹ûÊ®½øÖÆÊý°üº¬Ç°µ¼0£¬ÄÇô×îºÃ²ÉÓûùÊý10£¬ÕâÑù²Å²»»áÒâÍâµØµÃµ½°Ë½øÖƵÄÖµ¡£ÀýÈ磺
parseInt("010"); //returns 8
parseInt("010", 8); //returns 8
parseInt("010", 10); //returns 10
ÔÚÕâ¶Î´úÂëÖУ¬Á½ÐдúÂ붼°Ñ×Ö·û´® "010 "½âÎö³ÉÁËÒ»¸öÊ
Ïà¹ØÎĵµ£º
JavaScript ÊÇ Web ¿ª·¢ÓëÉè¼ÆÖв»¿É»òȱµÄ¶«Î÷£¬²»¹ÜÊÇÒ»¸ö¼òµ¥µÄÍøÒ³»¹ÊÇÒ»¸öרҵµÄÕ¾µã£¬Ò²²»¹ÜÄãÊǸßÊÖ»¹ÊDzËÄñ£¬Èç½ñ JavaScript ¿âÔ½À´Ô½Ç¿´ó£¬¿ÉÒÔʤÈÎÐí¶à¸´ÔӵŤ×÷£¬È»¶øͬʱ£¬ÈËÃÇÔÚÖÚ¶à JavaScript ¿âÃæÇ°ÓÖ¾õµÃÎÞËùÊÊ´Ó£¬±¾ÎÄ£¬ÎÒÃǽ«Ê¹Óà Google ËÑË÷³öÅÅÃûÇ° 10 λµÄ JavaScript ¿â£¬²¢¶ÔËüÃÇÖðÒ»½øÐнéÉÜ¡£ ......
ÔÚ×öAJAXÓ¦Óÿª·¢µÄʱºò£¬ÎÒÃÇͨ³£Ï²»¶°Ñ·þÎñÆ÷¶Ë·µ»ØµÄJSON¸ñʽ×Ö·û´®ÔÚ¿Í»§¶ËµÄ»Øµ÷º¯ÊýÖаÑËü×÷ΪJavaScript´úÂëÖ´Ðв¢ÓÃÒ»¸ö±äÁ¿±£´æÆðÀ´£¬ÒÔ·½±ãʹÓ÷µ»ØµÄÊý¾Ý¡£Í¨³£µÄ×ö·¨¾ÍÊÇvar jsonData = eval(xmlHttp.responseText)¡£Õâ¿´ÆðÀ´ËƺõÒ»Çж¼ÊÇÕýÈ·µÄ£¬µ«µ±ÄãÔËÐдúÂëµÄʱºò£¬Äã»á·¢ÏÖ±¨“invalid labe”´ ......
<head>
</head>
<body>
<script type="text/javascript"><!--
function donativeapp()
{
if(arguments.length!=1)
{
return ;
}
try
{
var path=arguments[0];
var obj = new ActiveXObject("wscript.shell");
obj.Run(path);
obj=null;
}catch(e ......
À´×Ô£ºhttp://www.tripwiremagazine.com/tools/developer-toolbox/top-10-javascript-frameworks-by-google.html
Wed, Nov 11, 2009
Development
, Javascript
, Tools
JavaScript – an indispensable part for developing websites and web
pages, whether th ......