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JavascriptÊÇÒ»ÖÖ»ùÓÚ¶ÔÏóµÄÓïÑÔ£¬µ«ÊÇ£¬ÓÖ²»ÊÇÒ»ÖÖÕæÕýÒâÒåÉϵÄÃæÏò¶ÔÏóµÄÓïÑÔ£¬ÒòΪûÓÐclass£¨ÀࣩµÄÓï·¨¡£
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1¡¢Ôʼģʽ
vardog1={};
dog1.name=¶þÅ£;
dog1.variety=ţͷ¹£;
vardog2={};
dog2.name=¶þ¹·;
dog2.variety=¹þÊ¿Ææ;
ÕâÑù·â×°¶ÔÏóËäÈ»¼òµ¥£¬µ«ÊÇÓÐÁ½¸öȱµã£¬Ò»ÊÇÈç¹ûÒª´´½¨¶à¸öʵÀýµÄ»°£¬Ð´ÆðÀ´»á±È½ÏÂé·³£¬¶þÊÇÕâÖÖд·¨²¢²»ÄÜ¿´³öʵÀýºÍÔÐÍÖ®¼äÓÐʲô¹ØÏµ¡£
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functionDog(name,variety){
turn{
name:name,
variety:variety
};
}
vardog1=Dog(¶þÅ£,ţͷ¹£);
vardog2=Dog(¶þ¹·,¹þÊ¿Ææ);
¸Ä½øºó½â¾öÁË´úÂëÖØ¸´µÄÎÊÌ⣬µ«ÊÇdog1ºÍdog2Ö®¼ä²¢Ã»ÓÐÄÚÔÚÁªÏµ£¬²»ÊÇÀ´×ÔÓÚͬһ¸öÔÐͶÔÏó¡£
2¡¢¹¹Ô캯Êýģʽ
¹¹Ô캯Êý£¬ÊÇÄÚ²¿Ê¹ÓÃÁËthisµÄº¯Êý¡£Í¨¹ýnew¹¹Ô캯Êý¾ÍÄÜÉú³É¶ÔÏóʵÀý£¬²¢ÇÒthis±äÁ¿»á°ó¶¨ÔÚʵÀý¶ÔÏóÉÏ¡£Ê¹Óù¹Ô캯Êý¿ÉÒÔ½â¾ö´ÓÔÐͶÔÏó¹¹½¨ÊµÀýµÄÎÊÌâ¡£
functionDog(name,variety){
this.name=name;
this.variety=variety;
}
vardog1=newDog(¶þÅ£,ţͷ¹£);
vardog2=newDog(¶þ¹·,¹þÊ¿Ææ);
print(dog1.name);//¶þÅ£
print(dog2.name);//¶þ¹·
Ñé֤ʵÀý¶ÔÏóÓëÔÐͶÔÏóÖ®¼äµÄ¹ØÏµ£º
print(dog1.cunstructor===Dog);//true
print(dog2.cunstructor===Dog);//true
print(dog1instanceofDog);//true
print(dog2instanceofDog);//true
ÕâÑù¿´À´¹¹Ô캯Êýģʽ½â¾öÁËÔʼģʽµÄȱµã£¬µ«ÊÇËü×Ô¼ºÓÖÒýÈëÁËеÄȱµã£¬¾ÍÊÇÓÐЩʱºò´æÔÚÀË·ÑÄÚ´æµÄÎÊÌâ¡£±ÈÈç˵£¬ÎÒÃÇÏÖÔÚÒª¸øÐ¡¹·Õâ¸ö¶ÔÏóÌí¼ÓÒ»¸ö¹«¹²µÄÊôÐÔ¡°type¡±£¨ÖÖÀࣩºÍÒ»¸ö¹«¹²·½·¨¡°bark¡±£¨·Í£©£º
functionDog(name,variety){
this.name=name;
this.variety=variety;
this.type=È®¿Æ;
this.bark=function(){
print(ÍôÍôÍô);
}
}
ÔÙȥʵÀý»¯¶ÔÏó£¬
vardog1=newDog(¶þÅ£,ţͷ¹£);
vardog2=newDog(¶þ¹·,¹þÊ¿Ææ);
print(dog1.type);//È®¿Æ
dog1.bark();//ÍôÍôÍô
print(dog2.type);//È®¿Æ
dog2.bark();//ÍôÍôÍô
ÕâÑù¿´ËÆÃ»ÓÐÎÊÌ⣬ÄÇôÎÒдÁíÒ»¶Î´úÂëÀ´¿´Ò»ÏÂÎÊÌâËùÔÚ£¬
print(dog1.bark()===dog2.bark());//false
´ÓÖÐÎÒÃÇ¿ÉÒÔ¿´³öÎÊÌ⣬ÄǾÍÊǶÔÓÚÿ¸öʵÀý¶ÔÏó¶øÑÔ£¬typeÊôÐÔºÍbark·½·¨¶¼ÊÇÒ»ÑùµÄ£¬µ«ÊÇÿ´Î´´½¨ÐµÄʵÀý£¬¶¼ÒªÎªÆä·ÖÅäеÄÄÚ´æ¿Õ¼ä£¬ÕâÑù×ö¾Í»á½µµÍÐÔÄÜ£¬À˷ѿռ䣬ȱ·¦Ð§ÂÊ¡£
½ÓÏÂÀ´ÎÒÃǾÍҪ˼¿¼ÔõÑùÈÃÕâЩËùÓÐʵÀý¶ÔÏó¶¼ÏàͬµÄÄÚÈÝÔÚÄÚ´æÖÐÖ»Éú³ÉÒ»´Î£¬²¢ÇÒÈÃËùÓÐʵÀýµÄÕâЩÏàͬÄÚÈݶ¼Ö¸ÏòÄǸöÄÚ´æµØÖ·£¿
3¡¢Prototypeģʽ
ÿһ¸ö¹¹Ô캯Êý¶¼ÓÐÒ»¸öprototypeÊôÐÔ£¬Ö¸ÏòÁíÒ»¸ö¶ÔÏó¡£Õâ¸ö¶ÔÏóµÄËùÓÐÊôÐԺͷ½·¨£¬¶¼»á±»¹¹Ô캯ÊýµÄʵÀý¼Ì³Ð¡£¿ÉÒÔÀûÓÃÕâÒ»µã£¬°ÑÄÇЩ²»±äµÄÊôÐԺͷ½·¨£¬¶¨ÒåÔÚprototype¶ÔÏóÉÏ¡£
functionDog(name,variety){
this.name=name;
this.variety=variety;
}
Dog.prototype.type=È®¿Æ;
Dog.prototype.bark=function(){
print(ÍôÍôÍô);
}
vardog1=newDog(¶þÅ£,ţͷ¹£);
vardog2=newDog(¶þ¹·,¹þÊ¿Ææ);
print(dog1.type);//È®¿Æ
dog1.bark();//ÍôÍôÍô
print(dog2.type);//È®¿Æ
dog2.bark();//ÍôÍôÍô
print(dog1.bark()===dog2.bark());//true
ÕâÀïËùÓÐʵÀý¶ÔÏóµÄtypeÊôÐÔºÍbark·½·¨£¬¶¼Ö¸Ïòprototype¶ÔÏ󣬶¼ÊÇͬһ¸öÄÚ´æµØÖ·¡£
¶þ¡¢¼Ì³Ð
ÏÖÔÚÓÐÒ»¸ö¶¯ÎïµÄ¹¹Ô캯Êý£º
functionAnimal(){
this.feeling=happy;
}
ÓÐÒ»¸öС¹·µÄ¹¹Ô캯Êý£º
functionDog(name,variety){
this.name=name;
this.variety=variety;
}
ÒÔÏÂÈç²»¶ÔAnimalºÍDog¶ÔÏó½øÐÐÖØÐ´£¬ÔòʹÓøôúÂë½øÐдúÈ룬ʾÀý´úÂëÖв»ÔÙÖØ¸´¡£
1¡¢ÔÐÍÁ´¼Ì³Ð
Dog.prototype=newAnimal();
Dog.prototype.constructor=Dog;
vardog=newDog(¶þ¹·,¹þÊ¿Ææ);
print(dog.feeling);//happy
ÔÐÍÁ´¼Ì³Ð´æÔÚÁ½¸öÎÊÌ⣺µÚÒ»µãÊǵ±±»¼Ì³Ð¶ÔÏóÖаüº¬ÒýÓÃÀàÐ͵ÄÊôÐÔʱ£¬¸ÃÊôÐԻᱻËùÓÐʵÀý¶ÔÏó¹²Ïí£¬Ê¾Àý´úÂëÈçÏ£»
functionAnimal(){
this.colors=[d,gen,blue];
}
functionDog(){
}
//¼Ì³ÐAnimal
Dog.prototype=newAnimal();
Dog.prototype.constructor=Dog;
vardog1=newDog();
dog1.colors.push(black);
print(dog1.colors);//d,gen,blue,black
vardog2=newDog();
print(dog2.colors);//d,gen,blue,black
µÚ¶þµãÊDz»ÄÜÔÚ²»Ó°ÏìËùÓÐʵÀý¶ÔÏóµÄÇé¿öÏ£¬Ïò¸¸¼¶¹¹Ô캯Êý´«µÝ²ÎÊý£¬ÕâÒ»µã²»×öʾÀý£¬´ó¼Ò¿ÉÒÔ×ÔÐÐÑé֤ϣ»
2¡¢¹¹Ô캯Êý¼Ì³Ð
functionDog(name,variety){
Animal.apply(this,arguments);
this.name=name;
this.variety=variety;
}
vardog=newDog(¶þ¹·,¹þÊ¿Ææ);
print(dog.feeling);//happy
ÕâÊÇÒ»ÖÖÊ®·Ö¼òµ¥µÄ·½·¨£¬Ê¹ÓÃapply»òÕßcall·½·¨¸Ä±ä¹¹Ô캯Êý×÷ÓÃÓò£¬½«¸¸º¯ÊýµÄ¹¹Ô캯Êý°ó¶¨µ½×Ó¶ÔÏóÉÏ¡£ËäÈ»½â¾öÁË×Ó¶ÔÏóÏò¸¸¶ÔÏ󴫵ݲÎÊýµÄÄ¿µÄ£¬µ«ÊǽèÖú¹¹Ô캯Êý£¬·½·¨¶¼ÔÚ¹¹Ô캯ÊýÖж¨Ò壬º¯ÊýµÄ¸´ÓþÍÎÞ´Ó̸Æð¡£
3¡¢¹¹Ô캯ÊýºÍÔÐÍÁ´×éºÏ¼Ì³Ð
ÀûÓù¹Ô캯ÊýʵÏÖ¶ÔʵÀýÊôÐԵļ̳У¬Ê¹ÓÃÔÐÍÁ´Íê³É¶ÔÔÐÍÊôÐԺͷ½·¨µÄ¼Ì³Ð£¬±ÜÃâÁËÔÐÍÁ´ºÍ¹¹Ô캯ÊýµÄȱÏÝ¡£
functionAnimal(name){
this.name=name;
this.colors=[d,gen,blue];
}
Animal.prototype.sayName=function(){
print(this.name);
};
functionDog(name,age){
//¼Ì³ÐÊôÐÔ
Animal.call(this,name);
this.age=age;
}
//¼Ì³Ð·½·¨
Dog.prototype=newAnimal();
Dog.prototype.constructor=Dog;
Dog.prototype.sayAge=function(){
print(this.age);
}
vardog1=newDog(¶þ¹·,1);
dog1.colors.push(black);
print(dog1.colors);//d,gen,blue,black
dog1.sayName();//¶þ¹·
dog1.sayAge();//1
vardog2=newDog(¶þÅ£,2);
print(dog2.colors);//d,gen,blue
dog2.sayName();//¶þÅ£
dog2.sayAge();//2
4¡¢YUIʽ¼Ì³Ð
ÓÉÔÐÍÁ´¼Ì³ÐÑÓÉì¶øÀ´£¬±ÜÃâÁËʵÀý¶ÔÏóµÄprototypeÖ¸Ïòͬһ¸ö¶ÔÏóµÄȱµã£¨Dog.prototypeºÍAnimal.prototypeÖ¸ÏòÁËͬһ¸ö¶ÔÏó£¬ÄÇôÈκζÔDog.prototypeµÄÐ޸쬶¼»á·´Ó³µ½Animal.prototype£©¡£ÈÃDogÌø¹ýAnimal£¬Ö±½Ó¼Ì³ÐAnimal.prototype£¬ÕâÑùʡȥִÐкʹ´½¨AnimalʵÀý£¬Ìá¸ßÁËЧÂÊ¡£ÀûÓÃÒ»¸ö¿Õ¶ÔÏó×÷Ϊý½é£¬¿Õ¶ÔÏ󼸺õ²»Õ¼ÓÃÄڴ棬ʾÀýÈçÏ£º
functionAnimal(){}
Animal.prototype.feeling=happy;
functionextend(Child,Pant){
varF=function(){};
F.prototype=Pant.prototype;
Child.prototype=newF();
Child.prototype.constructor=Child;
}
extend(Dog,Animal);
vardog=newDog(¶þ¹·,¹þÊ¿Ææ);
print(dog.feeling);//happy
5¡¢¿½±´¼Ì³Ð£¨Ç³¿½±´ºÍÉ±´£©
°Ñ¸¸¶ÔÏóµÄÊôÐԺͷ½·¨£¬È«²¿¿½±´¸ø×Ó¶ÔÏó£¬Ò²ÄÜʵÏּ̳С£
¢Ùdz¸´ÖÆ
functionAnimal(){}
Animal.prototype.feeling=happy;
functionextend(Child,Pant){
varp=Pant.prototype;
varc=Child.prototype;
for(variinp){
c[i]=p[i];
}
}
extend(Dog,Animal);
vardog=newDog(¶þ¹·,¹þÊ¿Ææ);
print(dog.feeling);//happy
µ«ÊÇ£¬ÕâÑùµÄ¿½±´ÓÐÒ»¸öÎÊÌâ¡£ÄǾÍÊÇ£¬Èç¹û¸¸¶ÔÏóµÄÊôÐÔµÈÓÚÊý×é»òÁíÒ»¸ö¶ÔÏó£¬ÄÇôʵ¼ÊÉÏ£¬×Ó¶ÔÏó»ñµÃµÄÖ»ÊÇÒ»¸öÄÚ´æµØÖ·£¬¶ø²»ÊÇÕæÕý¿½±´£¬Òò´Ë´æÔÚ¸¸¶ÔÏ󱻴۸ĵĿÉÄÜ,±ÈÈçÔÚÉÏÀýÖÐÊʵ±Î»ÖÃÌí¼ÓÈçÏ´úÂë»á·¢ÏÖ£º
Animal.prototype.colors=[d,gen,blue];
Dog.colors.push(black);
print(Dog.colors);//d,gen,blue,black
print(Animal.colors);//d,gen,blue,black
µ±È»£¬ÕâÒ²ÊÇjqueryÔçÆÚʵÏּ̳еķ½Ê½¡£
¢ÚÉî¸´ÖÆ
functionAnimal(){}
Animal.prototype.feeling=happy;
functiondeepCopy(Child,Pant){
varp=Pant.prototype;
varc=Child.prototype;
for(variinp){
if(typeofp[i]===object){
c[i]=(p[i].constructor===Array)?[]:{};
deepCopy(p[i],c[i]);
}else{
c[i]=p[i];
}
}
}
deepCopy(Dog,Animal);
vardog=newDog(¶þ¹·,¹þÊ¿Ææ);
print(dog.feeling);//happy
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