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used CoffeeScript class

A Pen By nakanishi

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JS

            
              #ES5-6のコメントは// CfSはこれ

#class クラス名:冒頭は大文字
class Start
	#コンストラクタは必須
	#引数がなかえればconstructor:()->でOK
	#コンストラクタは必ず->を使う
	#=>はだめ(@=thisの挙動が異なってしまうため)
	constructor: (a,b) ->
		#メンバ変数
		#@はES5-6のthis.と同じ意味
		@naka = a
		@nishi = b
		#単にコンストラクタのブロック内のローカル変数
		#コンストラクタ外では使用できない
		_local = 3
		#自身のメソッドを実行
		#クラスメソッドを実行する場合には、()が必要
		#メソッドの実行は常に()が必要だから
		@callStart()
		#コンストラクタ内で宣言したローカル変数は使える
		console.log "local"+ _local
	
	#以下メソッド
	callStart: =>
		console.log "start: " + @naka + @nishi
		
		#コンストラクタで宣言した_localはコンストラクタの外では使えないのでリファレンスエラーになる
		#console.log "local: " + _local
		
	log: =>
		console.log @naka + @nishi

#単にオブジェクトを作る
new Start "a","b"

#作ったものを代入
#変数の宣言時にvar等は宣言してはダメ
start = new Start "b","c"
#メソッドを実行
start.log();
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