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関数定義する方法

Last updated at Posted at 2021-06-04

関数定義


JavaScriptではfunctionを用いることで関数を定義することができます。注意点として引数がない場合にも()を記述する必要があります。

function 関数名(引数) {
  //処理
}

以下のコードをコンソールで記述し、実行。

function sayHello() {
 console.log("こんにちは")
}

sayHello()

以下のように表示されます。

VM2342:2 こんにちは
undefined
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