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

javascriptдÀ෽ʽ֮¶þ

2¡¢Ô­ÐÍ·½Ê½
/**
* PersonÀࣺ¶¨ÒåÒ»¸öÈË£¬ÓиöÊôÐÔname£¬ºÍÒ»¸ögetName·½·¨
*/
function Person(){}
Person.prototype.name = "jack";
Person.prototype.getName = function() { return this.name;}

°ÑÀàµÄÊôÐÔ£¨×ֶΣ©£¬·½·¨¶¼¹ÒÔÚprototypeÉÏ¡£
Ô켸¸ö¶ÔÏó²âÊÔÏ£º
var p1 = new Person();
var p2 = new Person();
console.log(p1.getName());//jack
console.log(p2.getName());//jack

¿ÉÒÔ¿´³öÊä³öµÄ¶¼ÊÇjack£¬ËùÒÔÔ­ÐÍ·½Ê½µÄȱµã¾ÍÊDz»ÄÜͨ¹ý²ÎÊýÀ´¹¹Ôì¶ÔÏóʵÀý
(Ò»°ãÿ¸ö¶ÔÏóµÄÊôÐÔÊDz»ÏàͬµÄ)
£¬ÓŵãÊÇËùÓжÔÏóʵÀý¶¼¹²ÏígetName·½·¨£¨Ïà¶ÔÓÚ¹¹Ô캯Êý·½Ê½£©£¬Ã»ÓÐÔì³ÉÄÚ´æÀË·Ñ
¡£


Ïà¹ØÎĵµ£º

ÓÉdzµ½ÉîÁ˽âJavaScriptÀà

ÀàÊÇʲô£¿
    
   Ðí¶à¸Õ½Ó´¥±à³ÌµÄÅóÓѶ¼¿ÉÄÜÀí½â²»ÁËÀ࣬ÆäʵÀàÊǶÔÎÒÃÇÕâ¸öÏÖʵÊÀ½çµÄÄ£Ä⣬°ÑËü˵³É“Àà±ð”»òÕß“ÀàÐÍ”¿ÉÄÜ»á¸üÈÝÒ×Àí½âһЩ¡£±ÈÈç“ÈË”ÕâÖÖ¶¯
Îï¾ÍÊÇÒ»¸öÀ࣬¶ø¾ßÌåijһ¸öÈ˾ÍÊÇ“ÈË”Õâ¸öÀàµÄÒ»¸öʵÀý
£¬
“È ......

[·­Òë]High Performance JavaScript(004)

XMLHttpRequest Script Injection  XHR½Å±¾×¢Èë
    Another approach to nonblocking scripts is to retrieve the JavaScript code using an XMLHttpRequest (XHR) object and then inject the script into the page. This technique involves creating an XHR object, downloading the JavaScript f ......

javascript arguments¶ÔÏó

ÔÚjavascriptº¯ÊýÌåÄÚ£¬±êʶ·ûarguments¾ßÓÐÌØÊ⺬Òå¡£ËüÊǵ÷ÓöÔÏóµÄÒ»¸öÌØÊâÊôÐÔ£¬ÓÃÀ´ÒýÓÃArguments¶ÔÏó¡£Arugments¶ÔÏó¾ÍÏñÊý×飬עÒâÕâÀïÖ»ÊÇÏñ²¢²»Êǹþ¡£
javascriptº¯ÊýÌåÄÚ£¬argumentsÏñÊý×é(²¢²»ÊÇÕæµÄÊý×飬ÊÇÒ»¸öArguments¶ÔÏó£¬ÔÙ´ÎÇ¿µ÷)Ò»Ñù£¬ÓÐlengthÊôÐÔ£¬¿ÉÒÔ´ú±í´«¸øº¯ÊýµÄ²ÎÊýµÄ¸öÊý¡£
ÒýÓÃÒ»¸öÐÎʽ²ÎÊ ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ