1 files changed, 80 insertions, 0 deletions
diff --git a/files/zh-cn/web/javascript/reference/operators/addition/index.html b/files/zh-cn/web/javascript/reference/operators/addition/index.html
new file mode 100644
index 0000000000..c3726a9413
--- /dev/null
+++ b/files/zh-cn/web/javascript/reference/operators/addition/index.html
@@ -0,0 +1,80 @@
+---
+title: 相加运算符 (+)
+slug: Web/JavaScript/Reference/Operators/Addition
+translation_of: Web/JavaScript/Reference/Operators/Addition
+original_slug: Web/JavaScript/Reference/Operators/相加
+---
+<div>{{jsSidebar("相加运算符")}}</div>
+
+<p>相加运算符 (<code>+</code>) 用于对两个操作数进行相加运算，如果操作数为字符串则该运算符将两个操作数连接成一个字符串。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/expressions-addition.html")}}</div>
+
+<div></div>
+
+
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox notranslate"><strong>表达式:</strong> <var>x</var> + <var>y</var>
+</pre>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="数字的相加运算">数字的相加运算</h3>
+
+<pre class="brush: js notranslate">// Number + Number -&gt; addition
+1 + 2 // 3
+
+// Boolean + Number -&gt; addition
+true + 1 // 2
+
+// Boolean + Boolean -&gt; addition
+false + false // 0
+</pre>
+
+<h3 id="字符串相加运算">字符串相加运算</h3>
+
+<pre class="brush: js notranslate">// String + String -&gt; concatenation
+'foo' + 'bar' // "foobar"
+
+// Number + String -&gt; concatenation
+5 + 'foo' // "5foo"
+
+// String + Boolean -&gt; concatenation
+'foo' + false // "foofalse"</pre>
+
+<p>注: '+'两侧只要有一侧是字符串，另一侧的数字则会自动转换成字符串，因为其中存在隐式转换</p>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">规范</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-addition-operator-plus', 'Addition operator')}}</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("javascript.operators.addition")}}</p>
+
+<h2 id="参考">参考</h2>
+
+<ul>
+ <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Subtraction">Subtraction operator</a></li>
+ <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Division">Division operator</a></li>
+ <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Multiplication">Multiplication operator</a></li>
+ <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Remainder">Remainder operator</a></li>
+ <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Exponentiation">Exponentiation operator</a></li>
+ <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Increment">Increment operator</a></li>
+ <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Decrement">Decrement operator</a></li>
+ <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Unary_negation">Unary negation operator</a></li>
+ <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Unary_plus">Unary plus operator</a></li>
+</ul>