今回解説していく内容は以下です！
本記事の内容
・WordPressでJavaScriptのalertを理解する
・alertの理解を深める
・jQueryのalertの記述方
alertとは？
alertとは、この記事を表示した時に出てきた警告ボックスです！
ホームページをぐるぐるまわっている（ネットサーフィン）とたまにこのようなalertが出てきますよね？これはJavaScriptで表示されており…コードは以下です。
alert("この記事では \n JavaScriptのalertと \n WrodPressでJavaScriptを記述する方法についてお伝えします。");
実際にJavaScriptを勉強する時にまずは、console.log（デバック用）をちょっと使ってみて次は alert で理解を深めようといった流れが多いかと思います。では、実際にWordPressでJavaScriptのalertを理解していきましょう！
WordPressでJavaScriptのalertを理解する
WordPressの記事にJavaScriptを記述できることはご存知でしょうか？実際にボタンを押すとalertが出てくると思います。WordPressにJavaScript（alert）を埋め込んで理解していきましょう！
WordPressで JavaScriptを使用する方法
テーマによっては、記事作成する際エディターの下の方に カスタムJavaScript という項目がありそこに JavaScriptを実際に記載するだけでOKです。
これがない場合には、<script>タグを使用し
<script>alert(“表示したい文字”);</script>
を ビジュアルではなくテキスト（HTML）に直接打ち込んでみてください！
alertの理解を深める
WordPressで alert をしようする方法はわかったかと思います。実際に、ボタンを押したら alert が出てくる仕組みは以下です！
<button id="a" class="btn" >A</button>
<script>
a.onclick = function() {
alert("ボタンを押しましたね？");
};
</script>
alertでは、単純にalertを出す仕組みで…
<button id="c" class="btn" >C</button>
<script>
c.onclick = function() {
if (window.confirm("confirmで表示しています。confirmについて知りたいですか？")) {
alert("知りたいです!");
} else {
alert("興味がありません。");
}
};
</script>
confirmを使うことによって 「Yes」「No」の選択をさせることが可能になります！上記のコードを見て alert の仕組みがなんとなく理解できたのではないでしょうか？
jQueryのalertの記述方
JavaScriptの拡張機能であるjQueryのalertの指定の仕方は少し違います。
<button id="jq" class="btn">jq</button>
<script>
jQuery(function(){
jQuery("#jq").on("click",function(){
window.alert("jQuery");
});
});
</script>
上記のように、jQuery(function(){ “やりたいこと” }); のような感じで指定します。なお、jQueryの部分は（$）で表記しても構いません。※jQueryのバージョンによっては異なります。
まとめ
いかがでしたか？WordPressでのJavaScriptの使用方法や、alertについて理解できたかと思います。あまりJavaSscriptをWordPressの記事で使う機会はないかもしれませんが、JavaScriptの動作確認（勉強）に使用するのもありかもしれませんね。ぜひ、参考にしてみてください！
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