标签：ES6 dbHost db 可选链 host ES11 config
原视频
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>可选链操作符</title>
</head>
<body>
<script>
// ?.
function main(config){
// const dbHost = config && config.db && config.db.host;
const dbHost = config?.db?.host;
console.log(dbHost);
}
main({
db: {
host:'192.168.1.100',
username: 'root'
},
cache: {
host: '192.168.1.200',
username:'admin'
}
})
</script>
</body>
</html>
标签：ES6,
dbHost,
db,
可选链,
host,
ES11,
config
From： https://www.cnblogs.com/chuixulvcao/p/17206278.html