鐃緒申鐃緒申鐃獣てわか鐃緒申砲鐃緒申鐃緒申覆辰討鐃緒申覺駈申鐃緒申鬚�つてわ申鐃藷ざわ申卒鐃緒申鐃緒申鐃緒申里如鐃�

JavaScript鐃祝わ申鐃緒申鐃緒申曚箸鐃緒申鐃緒申鐃銃のデ￥申鐃緒申鐃熟ワ申鐃瞬ワ申鐃緒申鐃緒申鐃夙でわ申鐃緒申

鐃緒申鐃瞬ワ申鐃緒申鐃緒申鐃夙わ申鐃緒申鐃緒申砲發わ申鐃緒申鐃緒申鐃緒申鐃緒申鐃殉わ申鐃緒申鐃緒申鐃緒申鐃緒申鐃叔は「メソ鐃獣ドわ申鐃緒申帖廚箸鐃緒申鐃緒申鐃緒申鐃緒申鐃縮ｏ申砲鐃緒申鐃緒申討鐃緒申鐃渋わ申鐃夙わ申鐃緒申鐃緒申鐃夙でわ申鐃緒申鐃渋際に醐申鐃銃みまわ申鐃順う鐃緒申

p(true.toString());
p("String".toString());
p((1).toString());
p((3.14159265).toString());
p([0,1,2,3].toString());
p({q:"answer to life, the universe, and everything", a:42}.toString());








鐃緒申鐃緒申鐃緒申鐃�.toString()鐃夙わ申鐃緒申鐃潤ソ鐃獣ドわ申鐃緒申辰討鐃緒申襪鰹申箸鐃緒申錣�鐃緒申泙鐃緒申鐃�


鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申弔鐃緒申鐃緒申祿逸申鐃緒申鐃緒申鐃殉わ申鐃緒申undefined鐃緒申null鐃叔わ申鐃緒申鐃緒申鐃緒申鐃緒申弔蓮鐃緒申佑鐃緒申覆鐃緒申廚箸鐃緒申鐃緒申佑任發�鐃緒申泙鐃緒申鐃緒申鐃緒申瓮緒申奪匹鐃緒申鐃緒申鐃殉わ申鐃緒申




try{
    p((undefined).valueOf());
}catch(e){
    p(e.message || e);
}
try{
    p((null).valueOf());
}catch(e){
    p(e.message || e);
}





鐃緒申鐃瞬ワ申鐃緒申鐃緒申鐃夙にわ申鐃緒申鐃緒申爐�鐃緒申 - 鐃竣ワ申潺謄鐃緒申屬隼鐃緒申鐃�


鐃緒申鐃塾ワ申鐃瞬ワ申鐃緒申鐃緒申鐃夙には￥申鐃渋わ申鐃緒申鐃緒申爐�鐃緒申泙鐃緒申鐃緒申佑鐃緒申里鐃塾わ申鐃術随申鐃緒申鐃緒申鐃緒申鐃叔わ申鐃緒申鐃塾と￥申鐃粛の誌申鐃夙わ申鐃緒申鐃緒申鐃緒申鐃叔わ申鐃淑わ申鐃緒申里任鐃緒申鐃緒申鐃緒申圓鐃瞬プワ申潺謄鐃緒申屐廚箸鐃緒申鐃緒申泙鐃緒申鐃�


鐃淑駕申鐃熟￥申鐃竣ワ申潺謄鐃緒申屬鐃緒申磧�




var a = true;
var b = a;
p('a is ', a, ', b is ', b, '.');
b = !b;
p('a is ', a, ', b is ', b, '.');

var a = 0;
var b = a;
p('a is ', a, ', b is ', b, '.');
b++;
p('a is ', a, ', b is ', b, '.');

var a = "Hello";
var b = a;
p('a is ', a, ', b is ', b, '.');
b = "JavaScript";
p('a is ', a, ', b is ', b, '.');





鐃緒申鐃緒申鐃銃以駕申鐃熟￥申鐃緒申鐃夙わ申鐃純。




var a = {x:'foo', y:'bar'};
var b = a;
p('a.x is ', a.x, ', b.x is ', b.x, '.');
b.x = 'baz';
p('a.x is ', a.x, ', b.x is ', b.x, '.');





鐃純い鐃緒申鐃緒か鐃緒申任鐃緒申腓�鐃緒申鐃緒申a = b鐃夙わ申鐃銃わ申鐃初、b鐃祝わ申鐃緒申鐃緒申鐃術わ申辰鐃緒申鐃緒申鐃順、鐃竣ワ申潺謄鐃緒申屬任鐃�b鐃緒申鐃緒申鐃緒申鐃術わ申辰討鐃緒申泙鐃緒申鐃緒申鐃緒申鐃緒申箸任鐃�a鐃緒申鐃術わ申辰討鐃緒申泙辰討鐃緒申泙鐃緒申鐃�


JavaScript鐃叔は￥申鐃緒申鐃緒申筌�鐃瞬ワ申鐃緒申鐃緒申鐃緒申--JavaScript鐃緒申鐃緒申鐃緒申砲鐃緒申鐃緒申襯�鐃瞬ワ申鐃緒申鐃緒申鐃緒申--鐃淑ど￥申鐃緒申鐃緒申鐃緒申鐃緒申造鐃竣わ申鐃緒申張鐃緒申屮鐃緒申鐃緒申鐃緒申箸蓮鐃緒申鐃渋わ申鐃緒申里鐃塾ではなわ申鐃緒申鐃緒申鐃夙わ申鐃縮わ申鐃銃わ申鐃緒申鐃緒申鐃緒申覆鐃緒申里任鐃緒申鐃緒申鐃緒申鐃緒申埜鐃緒申鐃緒申鐃�


a ==> {x:'foo', y:'bar'}
b ==> {x:'foo', y:'bar'}



鐃叔はなわ申鐃緒申


a ==v
    {x:'foo', y:'bar'}
b ==^



鐃夙なってわ申鐃緒申箸鐃緒申鐃緒申鐃緒申箸任鐃緒申鐃�


鐃緒申鐃緒申鐃術随申鐃緒申鐃竣ワ申潺謄鐃緒申屬鐃緒申鐃緒申箸鐃夙緒申蠅刻申鐃緒申鐃祝￥申任鐃緒申鐃緒申鐃緒申造亡鐃獣縁申鐃緒申鐃祝￥申鐃緒申鐃緒申鐃殉わ申鐃緒申typeof()鐃緒申鐃緒申鐃緒申佑鮓�わ申里任鐃緒申鐃�object鐃淑鰹申鐃緒申鐃緒申鐃銃プワ申潺謄鐃緒申屐鐃緒申鐃緒申鐃緒申泙瓠�鐃緒申鐃夙の常申鐃緒申必鐃緒申object鐃祝なわ申泙鐃緒申鐃�




Crockford鐃緒申鐃竣ワ申鐃夙ワ申鐃緒申鐃竣継常申


鐃緒申鐃緒申任蓮鐃緒申鐃�a鐃緒申鐃初コ鐃峻￥申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申b鐃緒申鐃緒申味鐃緒申鐃緒申鐃緒申鐃術わ申鐃緒申鐃緒申鐃竣常申鐃祝はどわ申鐃緒申鐃緒申鐃緒申茲わ申任鐃緒申腓�鐃緒申鐃緒申


鐃緒申鐃緒申鐃緒申茲刻申鐃緒申鐃祝￥申琉鐃縦わ申鐃緒申Crockford鐃緒申鐃緒申鐃縦わ申鐃緒申鐃竣ワ申鐃夙ワ申鐃緒申鐃緒申的鐃術常申鐃舜随申鐃叔わ申鐃緒申




var spawn = function(o){
    var F = function(){};
    F.prototype = o;
    return new F;
};

var a = {x:'foo', y:'bar'};
var b = spawn(a);
p('a.x is ', a.x, ', b.x is ', b.x, '.');
b.x = 'baz';
p('a.x is ', a.x, ', b.x is ', b.x, '.');
p('a.y is ', a.y, ', b.y is ', b.y, '.');





鐃緒申鐃緒申鐃緒申a鐃緒申鐃緒申鐃緒申佑鐃術常申鐃緒申鐃縦つ￥申b鐃舜わ申鐃術刻申鐃緒申a鐃祝及ばなわ申鐃処う鐃祝なってわ申鐃殉わ申鐃緒申


鐃緒申鐃緒申鐃緒申鐃緒申b = spawn(a)鐃祝わ申鐃緒申鐃緒申鐃緒申屬鐃�


a ==> {x:'foo', y:'bar'}
b ==> {x:'foo', y:'bar'}



鐃叔はわ申鐃緒申泙鐃緒申鐃�




a ===============v
                 {x:'foo', y:'bar'}
b ==> {prototype:^}



鐃淑のでわ申鐃緒申


鐃緒申鐃緒申鐃緒申鐃銃みわ申函鐃緒申錣�鐃緒申泙鐃緒申鐃�




var spawn = function(o){
    var F = function(){};
    F.prototype = o;
    return new F;
};

var a = {x:'foo', y:'bar'};
var b = spawn(a);
p('a.x is ', a.x, ', b.x is ', b.x, '.');
b.x = 'baz';
p('a.x is ', a.x, ', b.x is ', b.x, '.');
a.y = 'quux';
p('a.y is ', a.y, ', b.y is ', b.y, '.');






鐃緒申b.y鐃祝なわ申鐃緒申里鐃�b.prototype.y鐃緒申鐃緒申鐃夙わ申鐃緒申鐃竣￥申鐃緒申鐃曙が鐃竣ワ申鐃夙ワ申鐃緒申鐃緒申的鐃術常申鐃夙わ申鐃緒申鐃緒申味鐃淑のでわ申鐃緒申鐃緒申a鐃緒申b鐃緒申鐃緒申鐃緒申鐃緒申立鐃緒申鐃緒申鐃緒申鐃緒申鐃竣とわ申鐃緒申鐃緒申鐃熟わ申鐃緒申鐃緒申箸鐃緒申鐃獣と削申鐃獣わ申鐃緒申鐃夙にはなわ申泙鐃緒申鐃緒申鐃緒申曚箸鐃宿の常申鐃熟わ申鐃緒申能鐃淑�鐃叔わ申鐃順う鐃緒申鐃淑わ申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申立鐃緒申鐃緒申鐃緒申鐃峻￥申鐃緒申鐃淳わ申鐃緒申鐃緒申鐃祝は￥申鐃緒申鐃緒申404 Blog Not Found:javascript - uneval() for the rest of us!鐃叔紹介しわ申uneval.js鐃祝含まわ申鐃�clone()鐃舜随申鐃緒申箸鐃緒申泙鐃緒申鐃�


鐃緒申鐃緒申呂鐃緒申鐃夙わ申鐃銃￥申crockford鐃塾プワ申鐃夙ワ申鐃緒申鐃緒申的鐃術常申鐃舜随申鐃祝はもう鐃緒申帖鐃緒申廛鐃淳テワ申鐃瞬には使わ申鐃淑わ申鐃夙わ申鐃緒申鐃緒申鐃所が鐃緒申鐃緒申泙鐃緒申鐃�




var spawn = function(o){
    var F = function(){};
    F.prototype = o;
    return new F;
};

var a = 0;
var b = spawn(a);
p('a is ', a, ', b is ', b, '.');
b++;
p('a is ', a, ', b is ', b, '.');





鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申仆茲刻申鐃塾はわ申鐃緒申曚鐃緒申颪靴鐃緒申呂鐃緒申鐃殉わ申鐃緒申




var spawn = function(o){
    if (typeof(o) === 'object' && o !== null){
        var F = function(){};
        F.prototype = o;
        return new F;
    }else{
        return o;
    }
};

var a = 0;
var b = spawn(a);
p('a is ', a, ', b is ', b, '.');
b++;
p('a is ', a, ', b is ', b, '.');

var a = null;
var b = spawn(a);
p('a is ', a, ', b is ', b, '.');
b = !b;
p('a is ', a, ', b is ', b, '.');

var a = {x:'foo', y:'bar'};
var b = spawn(a);
p('a.x is ', a.x, ', b.x is ', b.x, '.');
b.x = 'baz';
p('a.x is ', a.x, ', b.x is ', b.x, '.');
p('a.y is ', a.y, ', b.y is ', b.y, '.');






鐃叔醐申鐃� - JavaScript 鐃緒申 Class 鐃熟なわ申


JavaScript鐃塾削申鐃緒申鐃緒申鐃縦э申鐃緒申鐃緒申鐃緒申鐃叔わ申鐃順う鐃緒申new鐃初算鐃述わ申鐃緒申鐃暑お鐃緒申鐃緒申鐃叔￥申鐃緒申鐃緒申鐃緒申鐃緒申 Class 鐃緒申鐃緒申鐃緒申茲�鐃祝醐申鐃緒申鐃熟わ申鐃殉わ申鐃緒申鐃緒申JavaScript 鐃祝わ申鐃緒申鐃銃は￥申鐃緒申鐃瞬ワ申鐃緒申鐃緒申鐃夙は￥申Class 鐃緒申属鐃緒申鐃緒申廚里任呂覆鐃緒申屮廛鐃緒申肇鐃緒申鐃緒申廖鐃緒申鐃緒申屮鐃緒申鐃緒申鐃緒申箸箸鐃緒申鐃緒申討鐃緒申鐃緒申鐃緒申濬个鐃緒申鐃緒申廚里任鐃緒申鐃�


Crockford 鐃熟￥申JavaScript: The Good Parts鐃竣にわ申鐃緒申鐃銃￥申new鐃初算鐃述わ申岼鐃緒申鐃緒申僉鐃緒申帖廚鐃淑�鐃準し鐃銃わ申鐃緒申里發緒申譴�鐃緒申由鐃叔わ申鐃緒申Class鐃祝器申鐃緒申討鐃緒申鐃夙実にへわ申討鐃緒申忙廚鐃緒申泙鐃緒申鐃緒申鐃緒申廛鐃緒申肇鐃緒申鐃緒申弖兢鐃緒申箸鐃緒申鐃緒申里呂泙鐃緒申鐃緒申鐃淑�鐃緒申鐃緒申辰討鐃緒申襪鰹申箸如鐃緒申崋鐃緒申鐃緒申廚帽佑鐃緒申鐃出わ申鐃緒申曚百鐃循でわ申覆鐃緒申鐃緒申篌�鐃夙最駈申呂曚箸鐃緒申new鐃初算鐃述わ申箸辰討鐃緒申泙鐃緒申鐃�


Dan the JavaScripter