number.toExponential()メソッド

投稿日: 2013年3月19日作成者: alphasis

number.toExponential()メソッドは、Numberオブジェクトの数値を指数表記にした文字列を返すメソッド。

構文

number.toExponential()

戻り値

指数表記にした文字列。

サンプル

<script type="text/javascript">
var $numberObject = new Number( 12345 );
document.write( $numberObject );
document.write( ' = 1.2345x10<sup>4</sup> = ' );
document.write( $numberObject.toExponential() + '<br />' );

var $numberObject = new Number( 1234.5 );
document.write( $numberObject );
document.write( ' = 1.2345x10<sup>3</sup> = ' );
document.write( $numberObject.toExponential() + '<br />' );

var $numberObject = new Number( 123.45 );
document.write( $numberObject );
document.write( ' = 1.2345x10<sup>2</sup> = ' );
document.write( $numberObject.toExponential() + '<br />' );

var $numberObject = new Number( 12.345 );
document.write( $numberObject );
document.write( ' = 1.2345x10<sup>1</sup> = ' );
document.write( $numberObject.toExponential() + '<br />' );

var $numberObject = new Number( 1.2345 );
document.write( $numberObject );
document.write( ' = 1.2345x10<sup>0</sup> = ' );
document.write( $numberObject.toExponential() + '<br />' );

var $numberObject = new Number( 0.12345 );
document.write( $numberObject );
document.write( ' = 1.2345x10<sup>-1</sup> = ' );
document.write( $numberObject.toExponential() + '<br />' );

var $numberObject = new Number( 0.012345 );
document.write( $numberObject );
document.write( ' = 1.2345x10<sup>-2</sup> = ' );
document.write( $numberObject.toExponential() + '<br />' );

var $numberObject = new Number( 0.0012345 );
document.write( $numberObject );
document.write( ' = 1.2345x10<sup>-3</sup> = ' );
document.write( $numberObject.toExponential() + '<br />' );
</script>

↓↓↓出力結果↓↓↓

カテゴリー: JavaScript, Numberオブジェクト, メソッド, リファレンス, 組み込みオブジェクトタグ: JavaScript 1.5 パーマリンク