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+---
+title: 'SyntaxError: identifier starts immediately after numeric literal'
+slug: Web/JavaScript/Reference/Errors/Identifier_after_number
+translation_of: Web/JavaScript/Reference/Errors/Identifier_after_number
+---
+<div>{{JSSidebar("Errors")}}</div>
+
+<h2 id="Message">Message</h2>
+
+<pre class="syntaxbox">SyntaxError: identifier starts immediately after numeric literal (Firefox)
+SyntaxError: Unexpected number (Chrome)
+</pre>
+
+<h2 id="Error_type">Error type</h2>
+
+<p>{{jsxref("SyntaxError")}}</p>
+
+<h2 id="What_went_wrong">What went wrong?</h2>
+
+<p>变量名叫{{Glossary("Identifier", "identifiers")}}，它符合某些规则，而你打破了这些规则！</p>
+
+<p>一个JavaScript标识符必须以字母开头，下划线（_）或美元符号（$）。他们不能以数字开头。只有后续字符可以是数字（0-9）。</p>
+
+<h2 id="Examples">Examples</h2>
+
+<h3 id="Variable_names_starting_with_numeric_literals">Variable names starting with numeric literals</h3>
+
+<p>Variable names can't start with numbers in JavaScript. The following fails:</p>
+
+<pre class="brush: js example-bad">var 1life = 'foo';
+// SyntaxError: identifier starts immediately after numeric literal
+
+var foo = 1life;
+// SyntaxError: identifier starts immediately after numeric literal
+</pre>
+
+<p>You will need to rename your variable to avoid the leading number.</p>
+
+<pre class="brush: js example-good">var life1 = 'foo';
+var foo = life1;
+</pre>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/JavaScript/Reference/Lexical_grammar">Lexical grammar</a></li>
+ <li><a href="/en-US/docs/Web/JavaScript/Guide/Grammar_and_types#Variables">Variables</a> in the <a href="/en-US/docs/Web/JavaScript/Guide">JavaScript Guide</a></li>
+</ul>