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javascript:(function(){
    var url = [
        "http://www.amazon.co.jp/gp/search/?field-keywords=%s",
        "https://www.google.co.jp/search?site=&source=hp&q=%s"
    ];
    var key = prompt("キーワードを入力");
    for(var i = 0;i <= url.length;i  ){
        var target = url[i].replace("%s",key);
        window.open(target,"_blank");
    };
})();