<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>函数参数默认值</title> </head> <body> <script> //ES6 允许给函数参数赋值初始值 //1. 形参初始值 具有默认值的参数, 一般位置要靠后(潜规则) // function add(a,c=10,b) { // return a + b + c; // } // let result = add(1,2); // console.log(result); //2. 与解构赋值结合 还可以给默认值,如果host不传值,那么默认:127.0.0.1 function connect({host="127.0.0.1", username,password, port}){ console.log(host) console.log(username) console.log(password) console.log(port) } connect({ host: 'atguigu.com', username: 'root', password: 'root', port: 3306 }) </script> </body> </html>
标签:username,ES6,console,log,函数参数,host,默认值 From: https://www.cnblogs.com/anjingdian/p/16905182.html