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JavaScriptでユーザー定義関数の使い方

Last updated at Posted at 2019-10-23

###まず、関数とは?
何らかの処理を一つにまとめて、
関数名で呼び出せるようにしたもの

##作成方法

funcion 関数名 (引数1,引数2,....)
{
 <処理
 return 戻り値;
}

  • 関数は英語で[function]
  • 引数はカンマで区切る
  • 関数を行った時の結果の戻り値をreturnで指定する
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
 "http://www.w3.org/TR/html4/loose.dtd">
<html>
...
... 
<title>ユーザー定義関数の作成</title>
<script type="text/javascript">

function priceOfFruit(unitPrice,count){
	var fruit;
	fruit = unitPrice * count;
	return fruit;
}

</script>
</head>

※ユーザー定義関数は好きな所で定義することが出来るけども
head関数に定義することで分かりやすくなる。

...
...

<script type="text/javascript">

	var fruit1 priceOfFruit= (100, 5);
	document.write(fruit1,"個</br>")

</script>
</p>
</body>
</html>
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