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---
title: 字串運算子
slug: >-
conflicting/Web/JavaScript/Guide/Expressions_and_Operators_eb65eb8f4e6b3c16f08b95149183cfb8
translation_of: Web/JavaScript/Guide/Expressions_and_Operators
translation_of_original: Web/JavaScript/Guide/Obsolete_Pages/Operators/String_Operators
original_slug: Web/JavaScript/Obsolete_Pages/Obsolete_Pages/Obsolete_Pages/運算子/字串運算子
---
<p> </p>
<h4 id="字串運算子" name="字串運算子">字串運算子</h4>
<p>除了比較運算子可以用於字串值以外，連結運算子 (+) 把兩個字串值串連在一起，返回另一個以兩個運算元字串連結的字串。例如，<code>"my " + "string"</code> 返回<code> "my string"</code> 字串。</p>
<p>代入運算子 += 的簡記法也可用於連結字串。例如，如果變數 <code>mystring</code> 內有 "alpha" 值，<code>mystring += "bet"</code> 表達式的求值為“alphabet”，並把這個值代入到 <code>mystring</code>。</p>
<p>{{ PreviousNext("Core_JavaScript_1.5_教學:運算子:邏輯運算子", "Core_JavaScript_1.5_教學:運算子:特殊運算子") }}</p>
<p>{{ languages( { "en": "en/Core_JavaScript_1.5_Guide/Operators/String_Operators", "es": "es/Gu\u00eda_JavaScript_1.5/Operadores/Operadores_de_cadenas_de_caracteres_(string)", "fr": "fr/Guide_JavaScript_1.5/Op\u00e9rateurs/Op\u00e9rateurs_li\u00e9s_aux_cha\u00eenes", "ja": "ja/Core_JavaScript_1.5_Guide/Operators/String_Operators", "ko": "ko/Core_JavaScript_1.5_Guide/Operators/String_Operators", "pl": "pl/Przewodnik_po_j\u0119zyku_JavaScript_1.5/Operatory/Operacje_na_\u0142a\u0144cuchach" } ) }}</p>
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