密码强度的js插件（完成）

效果如下图：

低：

中：

高：

页面上需要绑定的id如下：

 <div class="passwordtishi f12">

                    <font class="c666">安全程度：</font>

                    <span id="strength_L">弱</span><span id="strength_M">中</span><span id="strength_H">强</span>

                </div>

引用的js如下：

//密码强度弱中强变色js



//CharMode函数

//测试某个字符是属于哪一类.

function CharMode(iN) {

    if (iN >= 48 && iN <= 57) //数字

        return 1;

    if (iN >= 65 && iN <= 90) //大写字母

        return 2;

    if (iN >= 97 && iN <= 122) //小写

        return 4;

    else

        return 8; //特殊字符

}

//bitTotal函数

//计算出当前密码当中一共有多少种模式

function bitTotal(num) {

    modes = 0;

    for (i = 0; i < 4; i++) {

        if (num & 1) modes++;

        num >>>= 1;

    }

    return modes;

}

//checkStrong函数

//返回密码的强度级别

function checkStrong(sPW) {

    if (sPW.length <= 4)

        return 0; //密码太短

    Modes = 0;

    for (i = 0; i < sPW.length; i++) {

        //测试每一个字符的类别并统计一共有多少种模式.

        Modes |= CharMode(sPW.charCodeAt(i));

    }

    return bitTotal(Modes);

}

//pwStrength函数

//当用户放开键盘或密码输入框失去焦点时,根据不同的级别显示不同的颜色

function pwStrength(pwd) {

    O_color = "#eeeeee";

    L_color = "#FF0000";

    M_color = "#FF9900";

    H_color = "#33CC00";

    if (pwd == null || pwd == '') {

        Lcolor = Mcolor = Hcolor = O_color;

    }

    else {

        S_level = checkStrong(pwd);

        switch (S_level) {

            case 0:

                Lcolor = Mcolor = Hcolor = O_color;

            case 1:

                Lcolor = L_color;

                Mcolor = Hcolor = O_color;

                break;

            case 2:

                Lcolor = Mcolor = M_color;

                Hcolor = O_color;

                break;

            default:

                Lcolor = Mcolor = Hcolor = H_color;

        }

    }

    document.getElementById("strength_L").style.background = Lcolor;

    document.getElementById("strength_M").style.background = Mcolor;

    document.getElementById("strength_H").style.background = Hcolor;

    return;

}