和原有表单样式保持一致

<?= $form->field($model, 'password_hash')->passwordInput() ?>

<div class="form-group">
     <div class="col-sm-2 text-right">

     </div>
     <div class="col-sm-10">
          <label>
              <input id="showpassword" type="checkbox"> 显示密码
          </label>
     </div>
</div>

js部分

<script>
    // 显示密码 2020-7-9 09:49:07 lmy
    $('body').on('click','#showpassword',function (res) {
        if ($('#showpassword').prop('checked')) {
            $('#member-password_hash').prop('type','text');
        }else{
            $('#member-password_hash').prop('type','password');
        }
    })
</script>