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doc: update javascript.md (#271)
add JavaScript Functions 函数 line: 472-480
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@ -469,6 +469,15 @@ function sum(num1, num2) {
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sum(2, 4); // 6
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```
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### 立即执行函数
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```javascript
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//命名函数并立即执行一次
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(function sum(num1, num2) {
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return num1 + num2;
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})(2,4)//6
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```
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### 函数表达式
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```javascript
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