Random password generator (随机密码生成器)

function generatePassword(length, includeLowercase, includeUppercase, includeNumbers, includeSymbols){
 
	const lowercaseChars = "abcdefghijklmnopqrstuvwxyz";
	const uppercaseChars = "AbBCDEFGHIJKLMNOPQRSTUVWXYZ";
	const numberChars = "123456789";
	const symbolChars = "!@#$%^&*()_+="
 
	let allowedChars = "";
	let password = "";
 
	allowedChars += includeLowercase ? lowercaseChars : "";
	allowedChars += includeUppercase ? uppercaseChars : "";
	allowedChars += includeNumbers ? numberChars : "";
	allowedChars += includeSymbols ? symbolChars : "";
 
	if(length <= 0){
		return `(password length must be at least 1)`;
	}
 
	if(allowedChars.length === 0){
		return `(set of character needs to be selected)`;
	}
 
	for(let i = 0; i < length; i++){
		const randomIndex = Math.floor(Math.random() * allowedChars.length);
		password += allowedChars[randomIndex]
	}
 
	return password;
}
 
const passwordLength = 12;
const includeLowercase = true;
const includeUppercase = true;
const includeNumbers = true;
const includeSymbols = true;
 
const password = generatePassword(passwordLength,
								includeLowercase, 
								includeUppercase, 
								includeNumbers, 
								includeSymbols);
 
console.log(`generated password: ${password}`);