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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <meta charset="UTF-8">
- <meta http-equiv="X-UA-Compatible" content="IE=edge">
- <meta name="viewport" content="width=device-width, initial-scale=1.0">
- <title>Document</title>
- </head>
- <body>
- <script>
- //1.默认值c
- function add(a, b, c = 5){
- return a+b+c;
- }
- console.log(add(1,2,3))
- //2.与解构赋值结合
- // host默认值
- function connect({host='127.0.0.1',username,password,port}){
- console.log(host)
- }
- connect({
- //host:'localhost',
- username:'root',
- password:'root',
- port:3306
- })
- </script>
- </body>
- </html>
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