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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: 文字列演算子
+slug: Web/JavaScript/Guide/Operators/String_Operators
+---
+<h2 id=".E6.96.87.E5.AD.97.E5.88.97.E6.BC.94.E7.AE.97.E5.AD.90" name=".E6.96.87.E5.AD.97.E5.88.97.E6.BC.94.E7.AE.97.E5.AD.90">文字列演算子</h2>
+<p>比較演算子は文字列に使用できますが、これに加えて 2 つの文字列を結合する結合演算子 (+) も使用できます。これは 2 つのオペランドの文字列を結合した文字列を返します。例えば、<code>"my " + "string"</code> は <code>"my string"</code> という文字列を返します。</p>
+<p>短縮表記した代入演算子 += も文字列の結合に使用できます。例えば、変数 <code>mystring</code> に "alpha" という値が格納されているとき、式 <code>mystring += "bet"</code> の評価結果は "alphabet" となり、この値を <code>mystring</code> に代入します。</p>
+<p>{{ PreviousNext("JavaScript/Guide/Operators/Logical_Operators", "JavaScript/Guide/Operators/Special_Operators") }}</p>