黑色不透明度叠加使图像尺寸增大

Question

我有一个小问题,真的很烦我.每当我的图像悬停在上面时,会出现带有不透明度的黑色叠加层.但是,它会使图像高度增长.请注意,我不是指变换,规模属性.实际图像在图像底部的高度增长.

是什么造成的？

$('.home-img-block').find('img').each(function() {
  var imgClass = (this.width / this.height > 1) ? 'wide' : 'tall';
  console.log(imgClass);
  $(this).addClass(imgClass);
});

#home-img-block-section {
  width: 100%;
  height: 900px;
}
#home-img-blocks {
  width: 100%;
  height: 450px;
}
.home-img-block {
  width: 33.33%;
  /*height: 100%;*/
  float: left;
  display: inline-block;
  overflow: hidden;
  cursor: pointer;
  position: relative;
}
.home-img-block:hover .overlay {
  background: rgba(0, 0, 0, 0.6);
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
}
.home-img-block:after {
  content: attr(data-content);
  color: #fff;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  opacity: 0;
  transition: all 0.5s;
  -webkit-transition: all 0.5s;
  border: 1px solid #fff;
  padding: 20px 25px;
  text-align: center;
}
.home-img-block:hover:after {
  opacity: 1;
}
.home-img-block img {
  -webkit-transition: all 1s ease;
  /* Safari and Chrome */
  -moz-transition: all 1s ease;
  /* Firefox */
  -ms-transition: all 1s ease;
  /* IE 9 */
  -o-transition: all 1s ease;
  /* Opera */
  transition: all 1s ease;
}
.home-img-block:hover img {
  -webkit-transform: scale(1.25);
  /* Safari and Chrome */
  -moz-transform: scale(1.25);
  /* Firefox */
  -ms-transform: scale(1.25);
  /* IE 9 */
  -o-transform: scale(1.25);
  /* Opera */
  transform: scale(1.25);
  background: rgba(0, 0, 0, 0.3);
  width: 33.33%;
  max-height: 100%;
}
.home-img-block img.wide {
  max-width: 100%;
  max-height: 100%;
  height: auto;
  width: 100%;
}
.home-img-block img.tall {
  max-width: 100%;
  max-height: 100%;
  width: auto;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="home-img-blocks">
  <div data-content="FIND OUT MORE" class="home-img-block">
    <img src="http://optimumwebdesigns.com/images/test1.jpg">
    <div class="overlay"></div>
  </div>
  <div data-content="FIND OUT MORE" class="home-img-block">
    <img src="http://optimumwebdesigns.com/images/test2new.jpg">
    <div class="overlay"></div>
  </div>
  <div data-content="FIND OUT MORE" class="home-img-block">
    <img src="http://optimumwebdesigns.com/images/test3new.jpg">
    <div class="overlay"></div>
  </div>
</div>

Answer 1

图像有一种疯狂display.他们既不的block,inline-block或inline.尝试给display: block图像因为他们的baseline财产.

$('.home-img-block').find('img').each(function() {
  var imgClass = (this.width / this.height > 1) ? 'wide' : 'tall';
  console.log(imgClass);
  $(this).addClass(imgClass);
});

img {
  display: block;
}
#home-img-block-section {
  width: 100%;
  height: 900px;
}
#home-img-blocks {
  width: 100%;
  height: 450px;
}
.home-img-block {
  width: 33.33%;
  /*height: 100%;*/
  float: left;
  display: inline-block;
  overflow: hidden;
  cursor: pointer;
  position: relative;
}
.home-img-block:hover .overlay {
  background: rgba(0, 0, 0, 0.6);
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
}
.home-img-block:after {
  content: attr(data-content);
  color: #fff;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  opacity: 0;
  transition: all 0.5s;
  -webkit-transition: all 0.5s;
  border: 1px solid #fff;
  padding: 20px 25px;
  text-align: center;
}
.home-img-block:hover:after {
  opacity: 1;
}
.home-img-block img {
  -webkit-transition: all 1s ease;
  /* Safari and Chrome */
  -moz-transition: all 1s ease;
  /* Firefox */
  -ms-transition: all 1s ease;
  /* IE 9 */
  -o-transition: all 1s ease;
  /* Opera */
  transition: all 1s ease;
}
.home-img-block:hover img {
  -webkit-transform: scale(1.25);
  /* Safari and Chrome */
  -moz-transform: scale(1.25);
  /* Firefox */
  -ms-transform: scale(1.25);
  /* IE 9 */
  -o-transform: scale(1.25);
  /* Opera */
  transform: scale(1.25);
  background: rgba(0, 0, 0, 0.3);
  width: 33.33%;
  max-height: 100%;
}
.home-img-block img.wide {
  max-width: 100%;
  max-height: 100%;
  height: auto;
  width: 100%;
}
.home-img-block img.tall {
  max-width: 100%;
  max-height: 100%;
  width: auto;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="home-img-blocks">
  <div data-content="FIND OUT MORE" class="home-img-block">
    <img src="http://optimumwebdesigns.com/images/test1.jpg">
    <div class="overlay"></div>
  </div>
  <div data-content="FIND OUT MORE" class="home-img-block">
    <img src="http://optimumwebdesigns.com/images/test2new.jpg">
    <div class="overlay"></div>
  </div>
  <div data-content="FIND OUT MORE" class="home-img-block">
    <img src="http://optimumwebdesigns.com/images/test3new.jpg">
    <div class="overlay"></div>
  </div>
</div>