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      ¼Ì³Ð»úÖÆ£¬Ëµµ½¼Ì³Ð£¬¾ÍÒªÏëµ½´Ó»ùÀ࿪ʼ£¬µ«ÊÇJavaScriptÖеÄÀàÓÐÁ½´óÀࣺһ£¬ÄÚǶµÄ£»¶þ£¬Óû§×Ô¶¨Ò壻һ°ãǰÕß²»»á±»ÓÃÀ´×ö»ùÀ࣬ԭÒòÊÇΪÁ˱£ÕÏjsµÄ°²È«¡£µ«ÊÇÎÒÃÇ¿ÉÒÔͨ¹ýprototypeÀ´¶Ô»ùÀà½øÐÐÀ©³ä£¬Ôö¼ÓÎÒÃÇÏëÒªµÄÊôÐԺͷ½·¨¡£ÒÔÏÂÊÇ×Ô¼º¶Ô¼Ì³ÐµÄ¼¸ÖÖ·½Ê½µÄÀí½â¡£
1>  ¶ÔÏóð³ä£¬ÊÇJavaScript ºÍ ECMAScriptʵÏּ̳еķ½·¨£¬ÔÚѧϰ¶ÔÏóð³äʵÏּ̳ÐǰÎÒÃǵÄÏÈÁË½â¹Ø¼ü×Ö this µÄʹÓã¬ÀýÈ磺
          function classA(color){
this.color = color;
this.show = function(){alert(this.color);}
}
/*
Note:
1> this ´ú±íµÄÊÇclassAº¯ÊýËù¹¹½¨µÄ¶ÔÏ󣬶ø·Çº¯ÊýclassA¶ÔÏó±¾ÉíÕâÑù˵Ö÷ÒªÊÇΪÁ˱ÜÃ⣨function is object£©µÄÓ°Ïì;
2> ÔÚ¹¹½¨classA¶ÔÏóʱ£¬ÊÇͨ¹ýthisÀ´³õʼ»¯µÄÊôÐԺͷ½·¨µÄ£¬Èç¹ûÓÃclassBµÄthisȥð³äclassAµÄthis£¬ÄÇô¾ÍʵÏÖÁ˼òµ¥µÄ¼Ì³ÐÁË
*/
2>¼Ì³Ð»úÖÆµÄʵÏÖ·½Ê½£º 
    NO1£º¶ÔÏóð³ä
         ¶ÔÏóð³äµÄÔ­Àí£ºº¯ÊýclassAͨ¹ýthisÀ´³õʼ»¯ÊôÐԺͷ½·¨£¬Èç¹ûÓú¯ÊýclassBµÄthisð³äclassAµÄthisÈ¥Ö´ÐУ¬Ôò¾Í»áʹclassB¾ßÓÐclassAµÄÊôÐԺͷ½·¨¡£ÀýÈç
         function classA(sColor){
this.sColor = sColor;
this.show = function(){alert(this.sColor);}
}
function classB(sColor,sName){
this.new = classA;
this.new(sColor);
delete this.new;
/*
Note
±ØÐëÊÍ·ÅclassAµÄÒýÓã¬ÄÇÑù¶ÔÓÚclassAÊǰ²È«µÄ¡£¿ÉÊÇÔÙÖ´ÐÐÒ»¶ÎÒÔÉÏ´úÂ룬ʵÏÖ¶àÖØ¼Ì³Ð¡£
this.new = classC;
this.new(arguments);
delete this.new;
*/
this.sName = sName;
this.say = function(){alert(this.sName);}
}
var a = new classA("blue");
var b = new classB("red","BMW");
a.show(); // blue
b.say(); //BMW
b.show(); // red
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