JavaScriptÖÐÄäÃûº¯Êý£¬º¯ÊýÖ±½ÓÁ¿ºÍ±Õ°ü(ת)
ÔÎijö´¦: http://www.dnew.cn/post/196.htm
ÏÈ¿´ÏÂÏÂÃæ¼¸ÖÖд·¨
1.function f(x){return x*x;};f(x);
2.(function(x){return x*x;})(x);
3.(function(x){return x*x;}(x));
µÚÒ»ÖÖÎÒÃÇÓ¦¸Ã¶¼ºÜÊìϤÁË£¬ÕâÊÇÎÒÃǾ³£Ê¹ÓõÄд·¨¡£µÚ¶þµÚÈýÖÖ¶¼ÊÇÄäÃûº¯ÊýµÄд·¨¡£
--------------------------------------------------------------------------------
µÚ¶þÖÖ
¿ÉÒÔÕâÑùÀí½â£º
•var f=function(x) {return x*x;};f()
ÄÇÎÒÃDz»Í¨¹ýfÕâ¸ö±äÁ¿À´ÒýÓú¯Êý¾ÍÊÇ
•function(){}()
È»¶øÕâÑù¿Ï¶¨ÊÇ´íÎóµÄ¾ÍÏñ
•var f=1+2;
•f=f*0;
Óë
•var f=1+2*0;
½á¹û²»Í¬Ò»Ñù¡£
ÒªµÃµ½ÕýÈ·½á¹ûÖ»ÄÜ£º
•f=(1+2)*0;
Ò²¾ÍÊÇÒªÃ÷È·µÄ±êʶ³ö³ÌÐò¿é,¼´£º
•(function(){})()
¿ÏÄãÓÐÒÉÎÊ£ºÀ¨ºÅ“()”µ½µ×ÊDz»ÊÇÆðµ½Á˱êʶ´úÂë¿éµÄ×÷Óã¿
ÎÒÃÇ¿ÉÒÔÓÃJavaScriptµÄÄÚÖú¯Êý¼ì²âһϣ¡
¾ÙÒ»¸ö×î¼òµ¥µÄÀý×Ó£º
•alert(4)
Õâ¶Î´úÂë»áµ¯³öÌáʾÄÚÈÝÊÇ“4”
¸Ä³ÉÕâÑù
•(alert)(4)
¿ÉÒÔ¿´µ½Ö´ÐеÄЧ¹ûºÍÉÏÒ»¶Î´úÂëÒ»Ñù¡£
ÕâÖÖÐÎʽµÄº¯ÊýÖ´ÐÐÒ²±»ºÜ¶àJavaScript¿ò¼ÜËù²ÉÓá£
--------------------------------------------------------------------------------
µÚÈýÖÖ£¬Èç¹ûÄãÓùýjsvm¿ò¼ÜµÄ»°¾Í»á·¢ÏÖÀïÃæµÄ´úÂëʹÓÃÁËÕâÖÖÐÎʽ¡£
ÄÇÈçºÎ½âÊ͵ÚÈýÖÖÇé¿öÄØ?
ΪÁËŪÃ÷°×ä¯ÀÀÆ÷ÊÇÈçºÎÀí½âÕâÑùµÄд·¨µÄ£¬ÎÒÃÇ¿ÉÒÔÀûÓÃÒ»ÏÂMozilla FirefoxµÄ´íÎó¿ØÖÆÌ¨¹¦ÄÜ¡£
ÔÚ´úÂëÖвåÈëÒ»¶Î´íÎó´úÂ룬´úÂë¶ÎÈçÏ£º
•(function(s){s+s}(1)).splice();
´ò¿ªMozilla FirefoxµÄ´íÎó¿ØÖÆÌ¨£¬¿ÉÒÔ¿´µ½ÓÐÈçϵĴíÎóÌáʾ
´íÎó£º (function (s) {})(1) has no properties
Ô´Îļþ£ºfile:///C:/Documents…….html
ÐУº18
¿ÉÒÔÈÏΪ£¬ä¯ÀÀÆ÷¶ÔÓÚ
•(function(s){s+s}(1))
ÕâÑùµÄ´úÂë°´ÕÕ
•(function (s) {s+s})(1)
À´½âÎöµÄ¡£
Ïà¹ØÎĵµ£º
Data Format Conclusions Êý¾Ý¸ñʽ×ܽá
Favor lightweight formats in general; the best are JSON and a character-delimited custom format. If the data set is large and parse time becomes an issue, use one of these two techniques:
×ܵÄÀ´ËµÔ½ÇáÁ¿¼¶µÄ¸ñʽԽºÃ£¬× ......
Use the Fast Parts ʹÓÃËÙ¶È¿ìµÄ²¿·Ö
Even though JavaScript is often blamed for being slow, there are parts of the language that are incredibly fast. This should come as no surprise, since JavaScript engines are built in lower-level languages and are therefore compiled. Thou ......
ÓÉÓÚ»ðºüä¯ÀÀÆ÷²»Ö§³Ö“removeNode”º¯Êý£¬ËùÒÔһϴúÂëÖ»Ö§³ÖIE.
<!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>
< ......
1. Javascript Debug Toolkit½éÉÜ
JSDT(Javascript Debug Toolkit)ÊÇÒ»¸öÓÃÓÚjavascriptµ÷ÊÔµÄeclipse
²å¼þ£¬ÓÃÓÚµ÷ÊÔjavascript¡£JSDT¿ÉÒÔ¿çä¯ÀÀÆ÷µ÷ÊÔ£¬Ö§³ÖÔÚIE,Firefox,Safari,ChromeµÈÖ÷Á÷ä¯ÀÀÆ÷Öе÷ÊÔ
javascript¡£JSDTÖ§³ÖÉèÖöϵ㣬µ¥²½µ÷ÊԵȵ÷ÊÔ¹¤¾ßµÄ»ù±¾ÌØÐÔ¡£
2. ÈçºÎ°²×°
JSDTÊÇ»ùÓÚeclipse3.2+,jdk1.5+ ......
±¾ÎļòÒª½éÉÜJavaScriptÖÐconfirm,alert,promptµÄÓ÷¨,Ï£Íû´ó¼Òѧϰ¹ý³ÌÖÐÄܵõ½Ò»Ð©Æô·¢¡£
window.confirm ²ÎÊý¾ÍÖ»ÓÐÒ»¸ö¡£ÏÔʾÌáʾ¿òµÄÐÅÏ¢¡£°´È·¶¨,·µ»Øtrue£»°´È¡Ïû·µ»Øfalse¡£
< SCRIPT> var bln = window.confirm("È·¶¨Âð?"); alert(bln) < /SCRIPT> window.alert²ÎÊý£¬Ö»ÓÐ ......