与英文版同步并翻译为 zh-CN

1 files changed, 29 insertions, 37 deletions

diff --git a/files/zh-cn/web/javascript/reference/operators/left_shift_assignment/index.md b/files/zh-cn/web/javascript/reference/operators/left_shift_assignment/index.md
index 4499d3473c..af5ca56da0 100644
--- a/files/zh-cn/web/javascript/reference/operators/left_shift_assignment/index.md
+++ b/files/zh-cn/web/javascript/reference/operators/left_shift_assignment/index.md
@@ -1,55 +1,47 @@
 ---
-title: Left shift assignment (<<=)
+title: 左移赋值 (<<=)
 slug: Web/JavaScript/Reference/Operators/Left_shift_assignment
-translation_of: Web/JavaScript/Reference/Operators/Left_shift_assignment
+tags:
+  - Assignment operator
+  - JavaScript
+  - Language feature
+  - Operator
+  - Reference
+browser-compat: javascript.operators.left_shift_assignment
 ---
-<div>{{jsSidebar("Operators")}}</div>
+{{jsSidebar("Operators")}}
 
-<p>The left shift assignment operator (<code>&lt;&lt;=</code>) moves the specified amount of bits to the left and assigns the result to the variable.</p>
+左移赋值运算符 (`<<=`) 将变量向左移动指定数量的位，并将结果赋值给变量。
 
-<div>{{EmbedInteractiveExample("pages/js/expressions-left-shift-assignment.html")}}</div>
+{{EmbedInteractiveExample("pages/js/expressions-left-shift-assignment.html")}}
 
+## 语法
 
+```js
+x <<= y // x = x << y
+```
 
+## 例子
 
+### 使用左移赋值
 
-<h2 id="语法">语法</h2>
-
-<pre class="syntaxbox"><strong>Operator:</strong> x &lt;&lt;= y
-<strong>Meaning:</strong>  x   = x &lt;&lt; y</pre>
-
-<h2 id="Examples">Examples</h2>
-
-<h3 id="Using_left_shift_assignment">Using left shift assignment</h3>
-
-<pre class="brush: js">let a = 5;
+```js
+let a = 5;
 // 00000000000000000000000000000101
 
-a &lt;&lt;= 2; // 20
-// 00000000000000000000000000010100</pre>
-
-<h2 id="Specifications">Specifications</h2>
-
-<table class="standard-table">
- <tbody>
-  <tr>
-   <th scope="col">Specification</th>
-  </tr>
-  <tr>
-   <td>{{SpecName('ESDraft', '#sec-assignment-operators', 'Assignment operators')}}</td>
-  </tr>
- </tbody>
-</table>
+a <<= 2; // 20
+// 00000000000000000000000000010100
+```
 
-<h2 id="Browser_compatibility">Browser compatibility</h2>
+## 规范
 
+{{Specifications}}
 
+## 浏览器兼容性
 
-<p>{{Compat("javascript.operators.left_shift_assignment")}}</p>
+{{Compat("javascript.operators.left_shift_assignment")}}
 
-<h2 id="See_also">See also</h2>
+## 参考
 
-<ul>
- <li><a href="/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators#Assignment">Assignment operators in the JS guide</a></li>
- <li><a href="/en-US/docs/Web/JavaScript/Reference/Operators/Left_shift">Left shift operator</a></li>
-</ul>
+- [JS 指南中的赋值运算符](/zh-CN/docs/Web/JavaScript/Guide/Expressions_and_Operators#assignment)
+- [左移运算符](/zh-CN/docs/Web/JavaScript/Reference/Operators/Left_shift)