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jsで軽くクラス書きたい時のClass定義関数

Last updated at Posted at 2014-03-28

========================

jsインラインで済ませたい時に使ってます

使い方

    /**
     * クラスを定義してみる
     */
    var A = Class( Object, {

        /** コンストラクター */
        constructor: function( name ){
            /** @private */
            this._name = name;
        },
        
        /** プロパティ */
        name: { get: function(){ 
            return this._name; 
        }},

        /** メソッド */
        toString: function(){ 
            return "[object A name=\""+ this.name +"\"]"; 
        }
    });
    
    /**
     * 継承してみる
     */
    var B = Class( A, {
        constructor: function(){ 
            A.apply( this, arguments ); 
        },

        setName: function( value ){ 
            this._name = value; 
        },

        toString: function(){ 
            return "[object B name=\""+ this.name +"\"]"; 
        }
    });

    // つかってみる
    var a = new A( "aaa" );
    console.log( ""+a ); // "[object A name="aaa"]"

    var b = new B( "aaa" );
    console.log( ""+b ); // "[object B name="aaa"]"

    b.setName( "bbb" );
    console.log( ""+b ); // "[object B name="bbb"]"

ソース


    /** クラス */
    function Class(){
        if( arguments.length>= 2 ) {
            var impl=arguments[1],work={};
            for( var k in impl ) ( typeof impl[k] === "function" )? work[k]={ value:impl[k], writable:true }: work[k]=impl[k];
            var constructor = work.constructor.value;
            constructor.prototype = Object.create( arguments[0].prototype, work );
            return constructor;
        }
        throw new Error("");
    };

※{writable: true}追加したほうがいいかもしれません

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