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

// 接続先のURLやメソッドを設定します "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() {
	// readyState=4は全てのデータを受信済み、
	// status=200は正常に処理されたことを意味します
	if( req.readyState == 4 && req.status == 200 ) {
		// responseTextに格納された情報を出力
		alert( req.responseText );