我正在嘗試撰寫一個回呼函式，但不確定我是否做對了。你能檢查并糾正嗎？
`
let username = prompt("Enter your username :");
let password = prompt("Enter your password :");
const userValid = /^[a-za-z0-9_.]*$/.test(username);
const passwordValid = /^[a-za-z0-9_]*$/.test(password);
let check = () => {
if(userValid && passwordValid){
correct();
}else{
not();
}
}
let correct = () => {
let msg = new Date();
alert(`Welcome ${username}! Today is ${msg}.`);
}
let not = ()=> {
alert(`Given username and password pair is not correct.Please try again!`);
}
check(correct,not)
`
uj5u.com熱心網友回復：
您忘記將函式作為引數添加到check：
let check = (correct, not) => {
if(userValid && passwordValid){
correct();
}else{
not();
}
};
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