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

javascript prototype½éÉܵÄÎÄÕÂ

JavaScriptÊÇ»ùÓÚ¶ÔÏóµÄ£¬ÈκÎÔªËØ¶¼¿ÉÒÔ¿´³É¶ÔÏó¡£È»¶ø£¬ÀàÐͺͶÔÏóÊDz»Í¬µÄ¡£±¾ÎÄÖУ¬ÎÒÃdzýÁËÌÖÂÛÀàÐͺͶÔÏóµÄÒ»Ð©ÌØµãÖ®Í⣬¸üÖØÒªµÄÊÇÑо¿ÈçºÎд³öºÃµÄ²¢ÇÒÀûÓÚÖØÓõÄÀàÐÍ¡£±Ï¾¹£¬JavaScriptÕâÖÖÁ÷ÐеĽű¾ÓïÑÔÈç¹ûÄܹ»½øÐÐÁ¼ºÃµÄ·â×°£¬²¢ÐγÉÒ»¸öÅÓ´óµÄÀàÐͿ⣬¶ÔÓÚÖØÓÃÊǷdz£ÓÐÒâÒåµÄ¡£
ÍøÉ϶ÔÓÚprototypeµÄÎÄÕºܶ࣬һֱûÃ÷°×ºËÐĵÄ˼Ïë¡£×îºóдÁ˺ܶàÀý×Ó´úÂëºó²ÅÃ÷°×£ºprototypeÖ»ÄÜÓÃÔÚÀàÐÍÉÏ¡£
ÒÔÏÂÊÇһЩ¹ØÓÚÀàÐͺͶÔÏóµÄÀý×Ó£¬´ó¼Ò¿´ÍêÀý×Óºó¿ÉÄܸüÈÝÒ×Àí½âÀàÐͺͶÔÏóÖ®¼äµÄÁªÏµ£º
 
  Àý×Ó´úÂë ˵Ã÷
1 Object.prototype.Property = 1;
Object.prototype.Method = function ()
{
    alert(1);
}
 
var obj = new Object();
alert(obj.Property);
obj.Method();
¿ÉÒÔÔÚÀàÐÍÉÏʹÓÃproptotypeÀ´ÎªÀàÐÍÌí¼ÓÐÐΪ¡£ÕâЩÐÐΪֻÄÜÔÚÀàÐ͵ÄʵÀýÉÏÌåÏÖ¡£
JSÖÐÔÊÐíµÄÀàÐÍÓÐArray, Boolean, Date, Enumerator, Error, Function, Number, Object, RegExp, String
2 var obj = new Object();
obj.prototype.Property = 1; //Error
//Error
obj.prototype.Method = function()
{
    alert(1);
}
ÔÚʵÀýÉϲ»ÄÜʹÓÃprototype£¬·ñÔò·¢Éú±àÒë´íÎó
3 Object.Property = 1;
Object.Method = function()
{
    alert(1);
}
 
alert(Object.Property);
Object.Method();
¿ÉÒÔΪÀàÐͶ¨Ò哾²Ì¬”µÄÊôÐԺͷ½·¨£¬Ö±½ÓÔÚÀàÐÍÉϵ÷Óü´¿É
4 Object.Property = 1;
Object.Method = function()
{
    alert(1);
}
var obj = new Object();
alert(obj.Property); //Error
obj.Method(); //Error
ʵÀý²»Äܵ÷ÓÃÀàÐ͵ľ²Ì¬ÊôÐÔ»ò·½·¨£¬·ñÔò·¢Éú¶ÔÏó䶨ÒåµÄ´íÎó¡£
5 function Aclass()
{
this.Property = 1;
this.Method = function()
{
    alert(1);
}
}
var obj = new Aclass();
alert(obj.Property);
obj.Method();
Õâ¸öÀý×ÓÑÝʾÁËͨ³£µÄÔÚJavaScriptÖж¨ÒåÒ»¸öÀàÐ͵ķ½·¨
6 function Aclass()
{
this.Property = 1;
this.Method = function()
{
    alert(1);
}
}
Aclass.prototype.Property2 = 2;
Aclass.prototype.Method2 = function
{
    alert(2);
}
var obj = new Aclass();
alert(obj.Property2);
obj.Method2();
¿ÉÒÔÔÚÍ


Ïà¹ØÎĵµ£º

ͨ¹ýjavascript»ñµÃurl²ÎÊý

Ò³ÃæÌá½»Êý¾ÝÒ»°ãÓÐÁ½ÖÖ·½·¨£ºget,post¡£post¾ÍÊÇËùνµÄformÌá½»£¬Ê¹ÓÃÊÓͼ£»getÊÇͨ¹ýurlÌá½»¡£
Get·½·¨Ò»°ãÓúǫ́´úÂ루Èçasp,asp.net£©»ñµÃ²ÎÊý£¬´úÂëºÜ¼òµ¥£ºRequest.QueryString["id"];¼´¿É»ñÈ¡¡£ 
ÓÐЩʱºòÐèÒªÖ±½ÓÔÚǰ̨»ñÈ¡url²ÎÊý£¬ÒªÓõ½javascript£¬jsûÓÐÖ±½Ó»ñÈ¡url²ÎÊýµÄ·½·¨£¬ÄÇô£¬ÎÒÃÇÈçºÎͨ¹ýjs ......

[·­Òë]High Performance JavaScript(014)

Recursion Patterns  µÝ¹éģʽ
    When you run into a call stack size limit, your first step should be to identify any instances of recursion in the code. To that end, there are two recursive patterns to be aware of. The first is the straightforward recursive pattern represented ......

[·­Òë]High Performance JavaScript(024)

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£¬× ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ