函数参数默认值
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,b,c=10){
return a+b+c;
}
let result = add(1,2);
console.log(result);//13
//2.与解构赋值结合
function connect({host="127.0.0.1",username,password,port}){
console.log(host);
console.log(username);
console.log(password);
console.log(port);
}
connect({
host:'localhost',
username:'root',
password:'root',
port:3306
})