amachang鐃塾ワ申鐃緒申鐃夙わ申鐃緒申鐃緒申鐃緒申謬鐃�
JavaScript: 鐃舜随申鐃緒申鐃緒申鐃緒申 - 文鐃緒申鐃緒申鐃重�IT鐃熟わ申鐃潤哀鐃緒申鐃緒申鐃�TB鐃緒申鐃緒申鐃緒申鐃緒申謬鐃�

鐃書き器申鐃緒申鐃緒申鐃宿わ申鐃緒申鐃緒申

IT鐃緒記 - JavaScript 鐃塾関随申鐃緒申岼鐃緒申鐃緒申鐃緒申里泙鐃緒申屬鐃緒申鐃緒申鐃�

alert鐃緒申鐃緒申

alert(hoge);
hoge.method();
鐃緒申鐃峻わ申鐃宿わ申鐃緒申鐃緒申

alert + 鐃緒申鐃塾まわ申鐃瞬わ申鐃緒申

alert.s(hoge).method(); // 1 鐃緒申鐃銃￥申鐃夙のまわ申

Function鐃緒申鐃瞬ワ申鐃緒申鐃緒申鐃夙わ申鐃縦�

鐃夙わ申鐃緒申鐃緒け鐃叔￥申鐃舜随申鐃緒申trace鐃緒申鐃緒申method鐃緒申Function Object鐃緒申鐃宿加わ申鐃銃みる。

鐃殉わ申鐃熟種申鐃純。

鐃緒申鐃緒申鐃熟わ申鐃緒申鐃緒申

Function.prototype.trace = function(name, tracer){
    var self = this;
    if (!name)   name   = this.name || '__ANON__';
    if (!tracer) tracer = function(n, a, r){
        alert( n + '(' + a.join(', ') + ') = ' + r);
    };
    return function(){
        var retval;
        try{
            retval = self.apply(this, arguments);
        }catch(e){
            retval = e;
        }
        var a = [];
        for (var i = 0, l = arguments.length; i < l; i++){
            a[i] = arguments[i]
        }
        tracer(name, a, retval);
        return retval;
    }
}

鐃緒申鐃緒申覆蕾随申任鐃�trace鐃叔わ申鐃暑。鐃緒申鐃緒申鐃緒申鐃舜随申名鐃緒申trace鐃塾逸申鐃緒申鐃緒申鐃緒申鐃緒申覆鐃緒申箸鐃緒申鐃緒申覆鐃緒申箸鐃緒申鐃緒申里鐃緒申鐃緒申鐃�(鐃緒申鐃緒申鐃緒申鐃所、無名鐃舜随申鐃叔わ申trace鐃叔わ申鐃緒申)鐃緒申

trace()鐃緒申愎鐃緒申箸鐃緒申銅鐃緒申鐃�

鐃淑駕申鐃緒申Function Object鐃緒申鐃縦ワ申鐃緒申鐃塾ではなわ申鐃緒申鐃縮常申隆愎鐃緒申箸鐃緒申鐃�trace()鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申磧�

function trace(name, obj, tracer){
    if(!obj) obj = window;
    if(!(name in obj)){
        throw new Error("No '" + name + "' method in object " + obj);
    }
    if (!tracer) tracer = function(n, a, r){
        alert( n + '(' + a.join(', ') + ') = ' + r);
    };
    var orig = obj[name];
    obj[name] = function(){
        var retval;
        try{
            retval = orig.apply(this, arguments);
        }catch(e){
            retval = e;
        }
        var a = [];
        for (var i = 0, l = arguments.length; i < l; i++){
            a[i] = arguments[i]
        }
        tracer(name, a, retval);
        return retval;
    };
}

鐃夙わ申鐃緒申鐃熟￥申鐃緒申鐃緒申鐃緒申

function mul(x,y){ return x * y }
trace('mul');
mul(2, 4);

鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃銃わ申鐃縮わ申愎鐃縮常申鐃淑醐申鐃緒申鐃夙わ申鐃緒申鐃熟わ申鐃銃わ申鐃緒申里如鐃縮橘常申愎鐃緒申砲六箸鐃緒申覆鐃緒申鐃緒申鐃緒申譽�鐃緒申鐃緒申鐃緒申愎鐃緒申砲鐃夙わ申鐃祝わ申鐃緒申鐃緒申鐃純え鐃出￥申鐃淑駕申鐃熟ワ申鐃初ー鐃緒申

(funcition(){
    function mul(x,y){ return x * y }
    trace('mul');
    mul(2, 4);
})();

鐃緒申鐃緒申鐃緒申鐃緒申鐃銃逸申鐃緒申鐃�

(funcition(){
    var o = {};
    o.mul = function(x,y){ return x * y };
    trace('mul', o);
    o.mul(2, 4);
})();

鐃殉とわ申

DRY鐃緒申鐃緒申損鐃淑わ申鐃暑が鐃緒申Function.prototype.trace()鐃緒申鐃緒申鐃緒申JavaScript鐃獣ぽわ申鐃処う鐃祝思わ申鐃緒申

Enjoy!

Dan the JavaScripter

鐃宿居申:

Function#name鐃緒申standard鐃叔はなわ申鐃夙のわ申鐃夙￥申

Core JavaScript 1.5 Reference:Global Objects:Function - MDC
name: The name of the function (not part of the standard).

鐃緒申鐃緒申任癲�鐃遵記鐃塾よう鐃祝書き器申鐃緒申鐃銃わ申safe鐃淑のでわ申鐃緒申鐃緒申鐃殉わ申鐃殉わ申鐃緒申鐃緒申

鐃緒申^2鐃緒申:

JavaScript: 鐃舜随申鐃緒申鐃緒申鐃緒申 - 文鐃緒申鐃緒申鐃重�IT鐃熟わ申鐃潤哀
鐃緒申鐃緒申鐃緒申Function.prototype.trace鐃緒申鐃緒申鐃�10鐃緒申鐃旬で￥申 
retval = self.apply(null, arguments);
鐃夙￥申鐃緒申辰討鐃緒申泙辰討鐃緒申鐃塾で￥申鐃緒申鐃瞬ワ申鐃緒申鐃緒申鐃夙のメソ鐃獣ドわ申trace鐃緒申鐃処う鐃夙わ申鐃緒申箸鐃緒申泙鐃緒申鐃緒申鐃緒申泙鐃緒申鐃�

鐃夙わ申鐃緒申鐃緒け鐃叔￥申null鐃緒申this鐃緒申鐃術刻申鐃緒申鐃殉わ申鐃緒申鐃緒申鐃緒申鐃駿はわ申鐃殉わ申鐃峻わ申鐃熟わ申鐃叔わ申鐃緒申