javascript：评估用户输入的密码的强度

来源：互联网发布：windows双系统虚拟机编辑：程序博客网时间：2024/06/01 08:34

来自：http://outofmemory.cn/code-snippet/4655/pinggu-user-out-password-force

// Password strength meterfunction passwordStrength(password1, username, password2) {        var shortPass = 1,                badPass = 2,                goodPass = 3,                strongPass = 4,                mismatch = 5,                symbolSize = 0,                natLog, score;        // password 1 != password 2        if ((password1 != password2) && password2.length > 0)                return mismatch        //password < 4        if (password1.length < 4)                return shortPass        //password1 == username        if (password1.toLowerCase() == username.toLowerCase())                return badPass;        if (password1.match(/[0-9]/))                symbolSize += 10;        if (password1.match(/[a-z]/))                symbolSize += 26;        if (password1.match(/[A-Z]/))                symbolSize += 26;        if (password1.match(/[^a-zA-Z0-9]/))                symbolSize += 31;        natLog = Math.log(Math.pow(symbolSize, password1.length));        score = natLog / Math.LN2;        if (score < 40)                return badPass        if (score < 56)                return goodPass        return strongPass;}