为什么我无法将图像样式高度设置为100％的高度与DIV容器一样

Question

为什么我不能将图像样式高度设置为100％的高度与Div容器一样？

当我尝试测试代码时，它将显示为这样。

https://i.imgur.com/q1mgp0z.png

我想显示这样的图像。

https://i.stack.imgur.com/ot6ju.png

使用类名称img_look样式height: 100%;我该怎么做？

.li_look{
    padding: 0px;
    margin: 0;
    position: relative;
    width: 25%;
    border-right: 3px solid #fff;
    margin-right: -3px;
    z-index: 11;
    float: left;
    list-style: none;
    color: #333;
    font-size: 19px;
    background: #fff;
}
.div_1{
    float: none;
    margin: 0;
    width: 100%;
    height: 197.207px;
    display: block;
    position: relative;
}
.a_tag{
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    height: 100%;
    margin-left: auto;
    margin-right: auto;
    overflow: hidden;
    display: block;
    cursor: pointer;
}
.div_2{
    transform: translateX(-50%);
    left: 50%;
    top: 0;
    background-color: transparent;
    display: block;
    position: absolute;
}
.img_look{
    height: 100%;
    display: block;
    margin-left: auto;
    margin-right: auto;
    max-width: unset;
}

<ul>
  <li class="li_look"> 
    <div class="div_1">
      <a href="#" class="a_tag">
        <div class="div_2">
          <img src="https://i2.wp.com/www.thisblogrules.com/wp-content/uploads/2010/02/man-and-bear-bath.jpg?resize=550%2C356" class="img_look">
        </div>
      </a>
    </div>
  </li>
</ul>

Answer 1

问题在于IMG标签的父容器。由于没有定义的高度，因此您不能使用与父容器相关的100％。定义一个高度，如下所示。DIV_2。它会很好。

.li_look{
    padding: 0px;
    margin: 0;
    position: relative;
    width: 25%;
    border-right: 3px solid #fff;
    margin-right: -3px;
    z-index: 11;
    float: left;
    list-style: none;
    color: #333;
    font-size: 19px;
    background: #fff;
}
.div_1{
    float: none;
    margin: 0;
    width: 100%;
    height: 197.207px;
    display: block;
    position: relative;
}
.a_tag{
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    height: 100%;
    width:100%;
    margin-left: auto;
    margin-right: auto;
    overflow: hidden;
    display: block;
    cursor: pointer;
}
.div_2{
    transform: translateX(-50%);
    left: 50%;
    top: 0;
    background-color: transparent;
    display: block;
    position: absolute;
    height:100%;
}
.img_look{
    height: 100%;
    display: block;
    margin-left: auto;
    margin-right: auto;
    max-width: unset;
}

<ul>
  <li class="li_look"> 
    <div class="div_1">
      <a href="#" class="a_tag">
        <div class="div_2">
          <img src="https://i2.wp.com/www.thisblogrules.com/wp-content/uploads/2010/02/man-and-bear-bath.jpg?resize=550%2C356" class="img_look">
        </div>
      </a>
    </div>
  </li>
</ul>

Answer 2

您的图像大小与您的DIV相同，但是您的DIV与固定它的a标签的大小相同。由于您的a具有overflow:hidden;，您看不到您的DIV实际上更大。

您不能将height:100%;或width:100%;添加到您的DIV中，而是保持相同的图像尺寸。

另外：这感觉真的很不错，你不这么认为吗？

height: 197.207px;

Answer 3

我认为您需要此https://jsfiddle.net/wqhch5et/查看全屏模式。您需要更改位置：绝对；位置：固定；在Div_2中

.li_look{
    padding: 0px;
    margin: 0;
    position: relative;
    width: 25%;
    border-right: 3px solid #fff;
    margin-right: -3px;
    z-index: 11;
    float: left;
    list-style: none;
    color: #333;
    font-size: 19px;
    background: #fff;
}
.div_1{
    float: none;
    margin: 0;
    width: 100%;
    height: 197.207px;
    display: block;
    position: relative;
}
.a_tag{
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    height: 100%;
    margin-left: auto;
    margin-right: auto;
    overflow: hidden;
    display: block;
    cursor: pointer;
}
.div_2{
    transform: translateX(-50%);
    left: 50%;
    top: 0;
    background-color: transparent;
    display: block;
    position: fixed;
}
.img_look{
    height: 100%;
    display: block;
    margin-left: auto;
    margin-right: auto;
    max-width: unset;
}

<ul>
  <li class="li_look"> 
    <div class="div_1">
      <a href="#" class="a_tag">
        <div class="div_2">
          <img src="https://i2.wp.com/www.thisblogrules.com/wp-content/uploads/2010/02/man-and-bear-bath.jpg?resize=550%2C356" class="img_look">
        </div>
      </a>
    </div>
  </li>
</ul>