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                // XMLHttpRequestのインスタンスを作成
var req = new XMLHttpRequest();

// 送信時のメソッド、URL非同期通信にするかの真偽値を設定 "GET", "" );

// リクエストをサーバに送信
// 読み込み時の処理を設定
req.onreadystatechange = function() {
	try {
		// readyStateの4は全てのデータを受信済みを意味します
		if ( req.readyState == 4 ) {
			// statusの200は正常に処理されたことを意味します
			if ( req.status == 200 ) {
				console.log( JSON.parse( req.responseText ) );
			} else {
				console.error( "正常に処理されませんでした。" );
	} catch( e ) {
		console.error( "例外: " + e.description );