html - 放大图像的特定区域

Question

有没有办法引导缩放过渡放大图像的顶部或底部或任何其他特定区域？我目前正在这样做:

.grow { 
     transition: all 1s ease-in-out; 
}
.grow:hover { 
     transform: scale(8); 
}

<img src="http://placehold.it/350x150" class="grow"/>

我将如何对此进行扩展？

Answer 1

好的，首先，我从这个 website 中获取了代码.

快进到教程结尾，您将获得代码。

代码

$(document).ready(function() {

  var native_width = 0;
  var native_height = 0;

  $(".magnify").mousemove(function(e) {
    if (!native_width && !native_height) {
      var image_object = new Image();
      image_object.src = $(".small").attr("src");

      native_width = image_object.width;
      native_height = image_object.height;
    } else {
      var magnify_offset = $(this).offset();
      var mx = e.pageX - magnify_offset.left;
      var my = e.pageY - magnify_offset.top;

      if (mx < $(this).width() && my < $(this).height() && mx > 0 && my > 0) {
        $(".large").fadeIn(100);
      } else {
        $(".large").fadeOut(100);
      }
      if ($(".large").is(":visible")) {
        var rx = Math.round(mx / $(".small").width() * native_width - $(".large").width() / 2) * -1;
        var ry = Math.round(my / $(".small").height() * native_height - $(".large").height() / 2) * -1;
        var bgp = rx + "px " + ry + "px";

        var px = mx - $(".large").width() / 2;
        var py = my - $(".large").height() / 2;
        $(".large").css({
          left: px,
          top: py,
          backgroundPosition: bgp
        });
      }
    }
  })
})

* {
  margin: 0;
  padding: 0;
}
.magnify {
  width: 200px;
  margin: 50px auto;
  position: relative;
}
.large {
  width: 175px;
  height: 175px;
  position: absolute;
  border-radius: 100%;
  box-shadow: 0 0 0 7px rgba(255, 255, 255, 0.85), 0 0 7px 7px rgba(0, 0, 0, 0.25), inset 0 0 40px 2px rgba(0, 0, 0, 0.25);
  background: url('http://thecodeplayer.com/uploads/media/iphone.jpg') no-repeat;
  display: none;
}
.small {
  display: block;
}
* {
  margin: 0;
  padding: 0;
}
.magnify {
  width: 200px;
  margin: 50px auto;
  position: relative;
}
.large {
  width: 175px;
  height: 175px;
  position: absolute;
  border-radius: 100%;
  box-shadow: 0 0 0 7px rgba(255, 255, 255, 0.85), 0 0 7px 7px rgba(0, 0, 0, 0.25), inset 0 0 40px 2px rgba(0, 0, 0, 0.25);
  background: url('http://thecodeplayer.com/uploads/media/iphone.jpg') no-repeat;
  display: none;
}
.small {
  display: block;
}

<div class="magnify">

  <div class="large"></div>
  <img class="small" src="http://thecodeplayer.com/uploads/media/iphone.jpg" width="200" />

</div>

<script src="http://thecodeplayer.com/uploads/js/prefixfree.js" type="text/javascript"></script>
<script src="http://thecodeplayer.com/uploads/js/jquery-1.7.1.min.js" type="text/javascript"></script>