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JavaScript基礎①概要

someone

30 3月, 2019

「JavaScriptプログラミング基礎」

講座概要

Webアプリケーションを実装する際に使用するJavaScriptの基本文法
制御文、関数、イベント処理といったJavaScriptの文法
オブジェクトを使用した、文字列操作、ウィンドウ操作、フォームの入力チェック

目標

JavaScriptの概要の理解
JavaScriptの基本文法の理解
JavaScriptのオブジェクト操作の実装

①JavaScript概要

目標

JavaScriptの特徴
JavaScriptの記述方法

JavaScriptとは

動的コンテンツ作成のためのプログラミング言語

Ecma Internationalによる標準化:ブラウザ間で統一的な同じ動き
スクリプト言語:コンパイルしなくても実行時にコンパイルする
クライアントサイドでもサーバサイドでも使用可能

Webアプリケーションとは

ブラウザ→リクエスト→Webサーバ→DB→サーバ→レスポンス

JavaScript実行の流れ

ユーザの操作（イベント）をきっかけに処理が実行される

JavaScriptの作成と実行

ソースコードの作成:テキストエディタ

ソースコードの実行:実行環境=Webブラウザ

scriptタグとは

HTMLの中にソースコードを埋め込む形

<script type="text/javascript" src="xxx.js"></script>

外部ソースコードの読み込み設定

<script type="text/javascript" src="xxx.js"></script>

クロスブラウザ対策

さまざまな種類のブラウザでWebページを閲覧しても正しく動作させる対策

下記の処理で対策可能

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// 非対応時の処理

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