jQuery密码强度校验

HTML：

        <form class="form-horizontal" role="form" id="myform">
            <div class="form-group form-group-sm">
                <label class="col-md-2 control-label">旧密码：</label>
                <div class="col-md-4">
                    <input type="password" class="form-control" placeholder="旧密码" ng-model="updateData.oldPassword"  required/>
                </div>
            </div>
            <div class="form-group form-group-sm">
                <label class="col-md-2 control-label">新密码：</label>
                <div class="col-md-4">
                    <input type="password" class="form-control" id="pass"
                           ng-model="updateData.newPassword" placeholder="新密码" required/>
                </div>
                <div class="col-md-6">
                    <div class="tips">建议使用字母、数字和符号两种以上的组合，6-20个字符</div>
                </div>
            </div>
            <div class="form-group form-group-sm">
                <label class="col-md-2 control-label"></label>
                <div class="col-md-4 pw-strength" id="level">
                    <div class="pw-bar"></div>
                    <div class="pw-bar-on"></div>
                    <div class="pw-txt">
                        <span>弱</span>
                        <span>中</span>
                        <span>强</span>
                    </div>
                </div>
            </div>
            <div class="form-group form-group-sm">
                <label class="col-md-2 control-label">确认密码：</label>
                <div class="col-md-4">
                    <input type="password" class="form-control" placeholder="请再次输入新密码" ng-model="updateData.newPassword2"  required/>
                </div>
            </div>
            <div class="form-group">
                <button type="submit" class="btn btn-sm btn-search col-md-offset-4" ng-click="modifyPassword()"><i class="fa fa-edit"></i>修改</button>
                <button class="btn btn-sm btn-clear" type="reset"><i class="fa fa-mail-reply" aria-hidden="true"></i>重置</button>
             </div>
        </form>

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