Update index.md

原文中文描述感觉怪怪的，不太对，我修改了一下
mdn · Jul 6, 2023 · 2effd3e · 2effd3e
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@@ -5,7 +5,7 @@ slug: Web/JavaScript/Reference/Operators/Exponentiation_assignment
 
 {{jsSidebar("Operators")}}
 
-**幂赋值**（**`**=`**）运算符将左侧变量的值设置为右操作数的幂次方。
+**幂赋值**（**`**=`**）将左侧操作数取右侧操作数的幂的结果，赋值给左侧操作数。
 
 {{EmbedInteractiveExample("pages/js/expressions-exponentiation-assignment.html")}}