我有一个类似的问题，不能“妥协”的背景图像。 我想到了这个。

<div class="container">
    <img src="http://lorempixel.com/800x600/nature">
</div>

.container {
    position: relative;
    width: 25%; /* whatever width you want. I was implementing this in a 4 tile grid pattern. I used javascript to set height equal to width */
    border: 2px solid #fff; /* just to separate the images */
    overflow: hidden; /* "crop" the image */
    background: #000; /* incase the image is wider than tall/taller than wide */
}

.container img {
    position: absolute;
    display: block;
    height: 100%; /* all images at least fill the height */
    top: 50%; /* top, left, transform trick to vertically and horizontally center image */
    left: 50%;
    transform: translate3d(-50%,-50%,0);
}

//assuming you're using jQuery
var h = $('.container').outerWidth();
$('.container').css({height: h + 'px'});

希望这能有所帮助!

例子: https://jsfiddle.net/cfbuwxmr/1/

我有一个类似的问题，不能“妥协”的背景图像。 我想到了这个。

<div class="container">
    <img src="http://lorempixel.com/800x600/nature">
</div>

.container {
    position: relative;
    width: 25%; /* whatever width you want. I was implementing this in a 4 tile grid pattern. I used javascript to set height equal to width */
    border: 2px solid #fff; /* just to separate the images */
    overflow: hidden; /* "crop" the image */
    background: #000; /* incase the image is wider than tall/taller than wide */
}

.container img {
    position: absolute;
    display: block;
    height: 100%; /* all images at least fill the height */
    top: 50%; /* top, left, transform trick to vertically and horizontally center image */
    left: 50%;
    transform: translate3d(-50%,-50%,0);
}

//assuming you're using jQuery
var h = $('.container').outerWidth();
$('.container').css({height: h + 'px'});

希望这能有所帮助!

例子: https://jsfiddle.net/cfbuwxmr/1/

我用了不同的方法。你基本上需要裁剪矩形图像，使其适合正方形，这就是它的全部。最好的方法是如果图像宽度大于高度，那么你从图像的左边和右边稍微裁剪图像。如果图像高度大于图像宽度，则裁剪图像底部。这是我的解决方案。不过我需要PHP的一点帮助。

    <div style="position: relative; width: 154px; height: 154px; overflow: hidden;">
<?php 
        //get image dimmensions whichever way you like. I used imgaick
        $image = new Imagick("myimage.png");
        $width = $image->getImageWidth();  
        $height = $image->getImageHeight(); 
        if($width > $height){
 ?>
        <img src="myimage.png" style="display: block; position: absolute; top: 0px; left: 50%; transform: translateX(-50%); -ms-transform: translateX(-50%); -webkit-transform: translateX(-50%); height: 100%; " />
 <?php
        }else{
 ?>
        <img src="myimage.png" style="display: block; position: absolute; top: 0px; left: 0px; width: 100%; " />
 <?php
        }
 ?>

    </div>

现在你可以使用纵横比:

img {
   aspect-ratio: 1 / 1;
}

它在现代浏览器中也有广泛的支持: https://caniuse.com/mdn-css_properties_aspect-ratio

可以使用. testg类中的正方形尺寸的div:

.test {
width: 307px;
height: 307px;
overflow:hidden
}

.testimg {
    margin-left: -76px

}

或者一个正方形的div与图像的背景。

.test2 {
width: 307px;
height: 307px;
    background: url(http://i.stack.imgur.com/GA6bB.png) 50% 50%
}

这里有一些例子:http://jsfiddle.net/QqCLC/1/

更新以便图像中心

test { 宽度:307 px; 身高:307 px; 隐藏溢出: ｝ .testimg { margin-left: -76像素 ｝ .test2 { 宽度:307 px; 身高:307 px; background: url(http://i.stack.imgur.com/GA6bB.png ｝ <div class="test"><img src="http://i.stack.imgur.com/GA6bB.png" width="460" height="307" class=" testg " /></div> < div class = " test2 " > < / div >

假设它们不必出现在IMG标签中……

HTML:

<div class="thumb1">
</div>

CSS:

.thumb1 { 
  background: url(blah.jpg) 50% 50% no-repeat; /* 50% 50% centers image in div */
  width: 250px;
  height: 250px;
}

.thumb1:hover { YOUR HOVER STYLES HERE }

编辑:如果div需要链接到某个地方，只需调整HTML和样式如下:

HTML:

<div class="thumb1">
<a href="#">Link</a>
</div>

CSS:

.thumb1 { 
  background: url(blah.jpg) 50% 50% no-repeat; /* 50% 50% centers image in div */
  width: 250px;
  height: 250px;
}

.thumb1 a {
  display: block;
  width: 250px;
  height: 250px;
}

.thumb1 a:hover { YOUR HOVER STYLES HERE }

注意，这也可以修改为响应，例如%宽度和高度等。