JavaScript密码生成器创建奇怪的字符

Question

I have created a simple password generator using javascript.

When you click the button on the page, it creates you a password and displays it below. This password generator creates a string containing the following:

8 random letters from az.

2 random numbers from 0-9.

1 random special character from an array of strings. (see array 'chars').

However, after you click the button a few times, eventually, a password will be generated with 2 special characters, with a 'Â' in it. I'm confused because this character isnt in the chars array.

Why is this, and is there anyway to tell the JS to not include that character in particular?

 function myFunction() { // create initial arrays. a = []; var chars = ['#', '%', '£', '!', '?', '&']; for (var i = 97; i <= 122; i++) { a[a.length] = String.fromCharCode(i).toUpperCase(); // create random letters. var one = a[Math.floor(Math.random() * a.length)]; var two = a[Math.floor(Math.random() * a.length)]; var three = a[Math.floor(Math.random() * a.length)]; var four = a[Math.floor(Math.random() * a.length)]; var five = a[Math.floor(Math.random() * a.length)]; var six = a[Math.floor(Math.random() * a.length)]; var seven = a[Math.floor(Math.random() * a.length)]; var eight = a[Math.floor(Math.random() * a.length)]; // create random numbers. var int1 = Math.floor(Math.random() * 10); var int2 = Math.floor(Math.random() * 10); var ints = int1.toFixed(0) + int2.toFixed(0); var intsDecimal = int1.toFixed(0) + "." + int2.toFixed(0); // create random characters, based on array (chars). var randChar = chars[Math.floor(Math.random() * chars.length).toFixed(0)]; // create variable moving all letters, numbers and characters together. var c = one + two + three + four + five + six + seven + eight + ints + randChar; } // display variable c. document.getElementById('userPass').innerHTML = c; }

 <p>Using simple JS to create a random password.</p> <button onclick="myFunction()">CLICK</button> <h4>Your password is:</h4> <h3 id="userPass"></h3>

Answer 1

Generate a password using a specific pattern like 3 UpperCase, 3 lowercase, special char, and digit all lengths as you like.

const generatePassword = (str, limit) =>{
    let password = "";
        for (let i = 1; i <= limit; i++) {
               let char = Math.floor(Math.random()
                           * str.length);
               password += str.charAt(char)
           }
      return password;
}

let password = () => {
           let ucstr = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
            let lcstr = 'abcdefghijklmnopqrstuvwxyz';
            let digitstr = '0123456789';
            let spstr = '@#$';
            
           const password = generatePassword(ucstr, 5) + generatePassword(lcstr, 3)  + generatePassword(digitstr, 2)  + generatePassword(spstr, 2);
           return password;
       }
console.log("Your Password us ===> ", password());

Sample Output is AXTSFadsf34#@