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

javascriptдÀ෽ʽ֮Èý

È¡Ç°ÃæÁ½ÖÖµÄÓŵ㣺
a¡¢Óù¹Ô캯ÊýÀ´¶¨ÒåÀàÊôÐÔ£¨×ֶΣ©
b¡¢ÓÃÔ­ÐÍ·½Ê½À´¶¨ÒåÀàµÄ·½·¨¡£
¾ÍÓÐÁ˵ÚÈýÖÖ·½Ê½¡£ÕâÖÖ·½Ê½Ã²ËƲÉÓõÄÈ˽϶ࡣ
3¡¢×ۺϹ¹Ô캯Êý/Ô­ÐÍ
/**
* PersonÀࣺ¶¨ÒåÒ»¸öÈË£¬ÓиöÊôÐÔname£¬ºÍÒ»¸ögetName·½·¨
* @param {String} name
*/
function Person(name) {
this.name = name;
}
Person.prototype.getName = function() {
return this.name;
}

ÕâÑù£¬¼´¿Éͨ¹ý¹¹Ô캯Êý¹¹Ô첻ͬnameµÄÈË£¬¶ÔÏóʵÀýÒ²¶¼¹²ÏígetName·½·¨£¬²»»áÔì³ÉÄÚ´æÀË·Ñ¡£
µ«ËƺõÕâÑùµÄ´úÂë·ç¸ñËÆºõÈÔȻûÓÐjavaµÄÀàÄÇô½ô´Õ£¬°ÑÊôÐÔ£¬¹¹Ôì·½·¨£¨º¯Êý£©£¬·½·¨¶¼°üÔÚ´óÀ¨ºÅÄÚ¡£
public class Person {
//ÊôÐÔ£¨×ֶΣ©
String name;
//¹¹Ôì·½·¨£¨º¯Êý£©
Person(String name) {
this.name = name;
}
//·½·¨
String getName() {
return this.name;
}
}

ΪÁËÈÃjs´úÂë·ç¸ñ¸ü½ô´Õ£¬°Ñ¹ÒÔÚprototypeµÄ·½·¨´úÂëÒÆµ½function PersonµÄ´óÀ¨ºÅÄÚ¡£
function Person(name) {
this.name = name;
Person.prototype.getName = function() {
return this.name;
}
}

ËÆºõºÜÉñÆæ£¬»¹ÄÜÕâôд°¡£¡ÑéÖ¤Ò»ÏÂ
var p1 = new Person("Jack");
var p2 = new Person("Tom");
console.log(p1.getName());//Jack
console.log(p2.getName());//Tom

ûÓб¨´í£¬¿ØÖÆÌ¨Ò²ÕýÈ·Êä³öÁË¡£ËµÃ÷¿ÉÒÔÕâôд£¬ºÇºÇ¡£
àÅ£¬ËƺõºÜÍêÃÀ¡£
a ¡¢¿ÉÒÔͨ¹ý´«²Î¹¹Ôì¶ÔÏóʵÀý
b ¡¢¶ÔÏóʵÀý¶¼¹²Ïíͬһ·Ý·½·¨²»Ôì³ÉÄÚ´æÀË·Ñ
c ¡¢´úÂë·ç¸ñÒ²±È½Ï½ô´Õ
µ«Ã¿´ÎnewÒ»¸ö¶ÔÏóµÄʱºò¶¼»áÖ´ÐР 
Person.prototype.getName = function() {
        return this.name;
}
Ôì³ÉÁ˲»±ØÒªµÄÖØ¸´µÄÔËËã¡£ÒòΪgetName·½·¨¹ÒÔÚprototypeÉÏÖ»ÐèÖ´ÐÐÒ»´Î¼´¿É¡£Ö»ÐèÉÔ΢¸ÄÔìÏ£º
function Person(name) {
this.name = name;
if(Person._init==undefined) {
alert("ÎÒÖ»Ö´ÐÐÒ»´Î£¡");
Person.prototype.getName = function() {
return this.name;
}
Person._init = 1;
}
}

newÁ½¸ö¶ÔÏó£¬
var p1 = new Person("Andy");//µÚÒ»´Înew»áµ¯³ö'ÎÒÖ»Ö´ÐÐÒ»´Î£¡'
var p2 = new Person("Lily");//ÒÔºónewµÄ¶ÔÏó²»»áÔÙÖ´ÐÐÁË


Ïà¹ØÎĵµ£º

Javascript µÄ´Ê·¨×÷ÓÃÓò¡¢µ÷ÓöÔÏóºÍ±Õ°ü

×÷ÓÃÓò Scope
Javascript Öеĺ¯ÊýÊôÓÚ´Ê·¨×÷ÓÃÓò£¬Ò²¾ÍÊÇ˵º¯ÊýÔÚËü±»¶¨ÒåʱµÄ×÷ÓÃÓòÖÐÔËÐжø²»ÊÇÔÚ±»Ö´ÐÐʱµÄ×÷ÓÃÓòÄÚÔËÐС£ÕâÊÇϬţÊéÉϵÄ˵·¨¡£µ«“¶¨Òåʱ”ºÍ“Ö´ÐУ¨±»µ÷Óã©Ê±”ÕâÁ½¸ö¶«Î÷ÓÐЩÈ˸㲻Çå³þ¡£¼òµ¥À´Ëµ£¬Ò»¸öº¯ÊýAÔÚ“¶¨Òåʱ”¾ÍÊÇ function A(){} Õâ¸öÓï¾äÖ´ÐеÄʱºò¾Í ......

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(005)

µÚ¶þÕ  Data Access  Êý¾Ý·ÃÎÊ
    One of the classic computer science problems is determining where data should be stored for optimal reading and writing. Where data is stored is related to how quickly it can be retrieved during code execution. This problem in JavaScri ......

Javascript±äÁ¿×÷ÓÃÓò

ÇëÏÈ¿´ÏÂÌ⣺
if(true)
{
     a = 1;
}
alert(a);  //Êä³öɶ£¿
if(true)
{
    var a = 1; 
}
alert(a);  //ÕâÓÖÊä³öʲô£¿
ÔÚfirefox3.5Ï£¬µÚÒ»¸öÊä³ö1;µÚ¶þ¸öÊä³öundefined£¡£¡£¡
ÎªÉ¶ÄØ£¿ºÇºÇ£¬±¾ÈËÔڴ˰àÃÅŪ¸«Ò»Ï£º
Ò»°ãÇé¿öÏÂȱʡvarÉùÃ÷ʱ£¬Ä¬È ......

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