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+---
+title: Reserved Words
+slug: conflicting/Web/JavaScript/Reference/Lexical_grammar
+translation_of: Web/JavaScript/Reference/Lexical_grammar#Keywords
+translation_of_original: Web/JavaScript/Reference/Reserved_Words
+original_slug: Web/JavaScript/Reference/Reserved_words
+---
+<p> </p>
+
+<p>以下这些是ECMAScript规范已经规定的关键字，不能用作变量、函数名、过程、和对象名：</p>
+
+<ul>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Statements/break">break</a></li>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Statements/switch">case</a></li>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Statements/try...catch">catch</a></li>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Statements/continue">continue</a></li>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Statements/switch">default</a></li>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Operators/Special_Operators/delete_Operator">delete</a></li>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Statements/do...while">do</a></li>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Statements/if...else">else</a></li>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Statements/try...catch">finally</a></li>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Statements/for">for</a></li>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Statements/function">function</a></li>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Statements/if...else">if</a></li>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Statements/for...in">in</a></li>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Operators/Special_Operators/instanceof_Operator">instanceof</a></li>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Operators/Special_Operators/new_Operator">new</a></li>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Statements/return">return</a></li>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Statements/switch">switch</a></li>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Operators/Special_Operators/this_Operator">this</a></li>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Statements/throw">throw</a></li>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Statements/try...catch">try</a></li>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Operators/Special_Operators/typeof_Operator">typeof</a></li>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Statements/var">var</a></li>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Operators/Special_Operators/void_Operator">void</a></li>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Statements/while">while</a></li>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Statements/with">with</a></li>
+</ul>
+
+<p>以下是ECMAScript规定的保留字：</p>
+
+<ul>
+ <li>abstract</li>
+ <li>boolean</li>
+ <li>byte</li>
+ <li>char</li>
+ <li>class</li>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Statements/const">const</a></li>
+ <li>debugger</li>
+ <li>double</li>
+ <li>enum</li>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Statements/export">export</a></li>
+ <li>extends</li>
+ <li>final</li>
+ <li>float</li>
+ <li>goto</li>
+ <li>implements</li>
+ <li><a href="cn/Core_JavaScript_1.5_Reference/Statements/import">import</a></li>
+ <li>int</li>
+ <li>interface</li>
+ <li>long</li>
+ <li>native</li>
+ <li>package</li>
+ <li>private</li>
+ <li>protected</li>
+ <li>public</li>
+ <li>short</li>
+ <li>static</li>
+ <li>super</li>
+ <li>synchronized</li>
+ <li>throws</li>
+ <li>transient</li>
+ <li>volatile</li>
+</ul>
+
+<p>请注意，虽然ECMA-262还没有正式规定，但是在Mozilla中const,export和import已经被作为保留字对待。</p>
+
+<div class="noinclude"><a href="cn/Cn/Core_JavaScript_1.5_Reference/Reserved_Words">cn:Core JavaScript 1.5 Reference:Reserved Words</a>
+
+<p> </p>
+</div>
+
+<p>{{ languages( { "en": "en/Core_JavaScript_1.5_Reference/Reserved_Words" } ) }}</p>