生成随机密码(保证一个大写字母，一个小写字母，一个数字，一个特殊字符)

generatePassword.js

function generatePassword(length) {

    let charsets = ['ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz', '0123456789', '!#$%&*']

    let allCharsets = charsets.join('')

    let retVal = ''

    for (let i = 0, len = charsets.length; i < len; i++) {
        let n = charsets[i].length
        retVal += charsets[i].charAt(Math.floor(Math.random() * n));
    }

    for (let i = 0, n = allCharsets.length; i < length - 4; i++) {
        retVal += allCharsets.charAt(Math.floor(Math.random() * n));
    }
    
   
    return Array.from(retVal).sort(() => 0.5 - Math.random()).join('')
}

generatePassword(8)