<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <script> //减少重复的代码把。 function getSum(a,b) { let res=a+b; return res; } let num1 = 10; let num2 = 20; let result = getSum(num1, num2); console.log(result); </script> </body> </html>
JS函数定义步骤 10 等于30啦
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