底部带有三角形的 div 和背景图像 [英] div with triangle at the bottom with background image

问题描述

我想做一个div，底部有一个三角形.但是我需要出现三角形上的背景图像，我尝试使用伪元素 (:after) 但它不起作用.

I want to make a div, with a triangle at the bottom. But I need the background image on the triangle to appear, I've tried using a pseudo element (:after) but it doesn't work.

#homebg:after{
    content:'';
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin: 0 auto;
    width: 0;
    height: 0;
    border-top: solid 50px #fff;
    border-left: solid 48vw transparent;
    border-right: solid 48vw transparent;
}

我需要使 div 看起来像这张图片中的 background 三角形:

I need to make the div appear like in this image with the background in the triangle :

推荐答案

纯色上的三角形

如果三角形显示在纯色上，您可以将这种方法与绝对定位的伪元素一起使用:

Triangle over a plain color

If the triangle is displayed over a plain color, you can use this approach with an absolutely positioned pseudo element :

div{
    position:relative;
    background:url('http://i.imgur.com/W27LCzB.jpg');
    background-size:cover;
    min-height:100px;
    padding-bottom:100px;
    overflow:hidden;
}
div:after{
    content:'';
    position:absolute;
    bottom:0; left:0;
    border-left:50vw solid #fff;
    border-right:50vw solid #fff;
    border-top:100px solid transparent;
}

<div></div>

三角形的左右部分被伪元素的左右边框隐藏.这就是为什么这种方法不适用于渐变或图像的原因.

The left and right parts of the triangle are hidden by the left and right borders of the pseudo element. That is why this approach won't work over a gradient or image.

在这些情况下，您可以使用带有 clipPath 和 polygon 元素:

In these cases, you can use an inline svg with clipPath and a polygon element :

body, html{
  height:100%;
  background:url('https://farm8.staticflickr.com/7187/6895047173_d4b1a0d798.jpg')no-repeat center center;
  background-size:cover;
}
svg{
  display:block;
  width:100%;
  }

<svg viewbox="0 0 100 40">
  <clipPath id="clip">
    <polygon points="0 0 100 0 100 25 50 40 0 25" />
  </clipPath>
  <image xlink:href="https://farm4.staticflickr.com/3165/5733278274_2626612c70.jpg"  width="100" height="65" clip-path="url(#clip)"/>
</svg>

对于相同的结果，还有其他可能的方法.你可以在这里找到一些:CSS透明箭头/三角形

There are other possible approaches for the same result. You can find some here : CSS Transparent arrow/triangle

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