//function（関数）の定義
function sample(){
document.write( 'Hello World!' );
}
//function（関数）の呼び出し
sample();
External CSS
This Pen doesn't use any external CSS resources.
External JavaScript
This Pen doesn't use any external JavaScript resources.
//function（関数）の定義
function sample(){
document.write( 'Hello World!' );
}
//function（関数）の呼び出し
sample();This Pen doesn't use any external CSS resources.
This Pen doesn't use any external JavaScript resources.