1 <html lang="en"> 2 <head> 3 <meta charset="UTF-8"> 4 <meta name="viewport" content="width=device-width, initial-scale=1.0"> 5 <meta http-equiv="X-UA-Compatible" content="ie=edge"> 6 <title>默认传参</title> 7 </head> 8 <body> 9 <script> 10 //默认传参 11 // function Calc(num1,num2){ 12 // num1=num1===undefined?0:num1 13 // num2=num2===undefined?0:num2 14 // return num1+num2 15 // } 16 // console.log(Calc(2,5)) 17 //默认传参 ---使用arguments 18 function Calc1(x,y){ 19 x=arguments[0]?arguments[0]:1; 20 y=arguments[1]?arguments[1]:2; 21 22 return x+y 23 } 24 console.log(Calc1()) 25 </script> 26 </body> 27 </html>
原文：https://www.cnblogs.com/yuanxiangguang/p/11108765.html