doc: update javascript.md (#271)

add JavaScript Functions 函数 line: 472-480
jaywcjlove · Jan 14, 2023 · 6b570f2 · 6b570f2
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commit 6b570f2
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diff --git a/docs/javascript.md b/docs/javascript.md
@@ -469,6 +469,15 @@ function sum(num1, num2) {
 sum(2, 4); // 6
 ```
 
+### 立即执行函数
+
+```javascript
+//命名函数并立即执行一次
+(function sum(num1, num2) {
+  return num1 + num2;
+})(2,4)//6
+```
+
 ### 函数表达式
 
 ```javascript