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  特定总结一下给背景图层加颜色遮罩的方法。
 
  方法一:通过定位叠加(注意层级)
 
  <div class="wrap1">
 
  <div class="inner"> </div>
 
  </div>
 
  .wrap1 {
 
  position: relative;
 
  width: 1200px;
 
  height: 400px;
 
  background: rgba(0, 0, 0, .5);
 
  }
 
  .wrap1 .inner {
 
  position: absolute;
 
  left: 0;
 
  right: 0;
 
  top: 0;
 
  bottom: 0;
 
  background: url(ban8.jpg) no-repeat center center;
 
  background-size: cover;
 
  z-index: -1;
 
  }
 
  方法二:通过伪类元素叠加
 
  <div class="wrap2"></div>
 
  .wrap2 {
 
  position: relative;
 
  width: 1200px;
 
  height: 400px;
 
  background: url(ban8.jpg) no-repeat center center;
 
  background-size: cover;
 
  }
 
  .wrap2::before {
 
  content: "";
 
  position: absolute;
 
  left: 0;
 
  right: 0;
 
  bottom: 0;
 
  top: 0;
 
  background-color: rgba(0, 0, 0, .5);
 
  z-index: 2;
 
  }
 
  方法三:CSS3颜色叠加background-blend-mode:multiply;(正片叠底)
 
  <div class="wrap3"></div>
 
  .wrap3 {
 
  position: relative;
 
  width: 1200px;
 
  height: 400px;
 
  background: url(ban8.jpg) rgba(0, 0, 0, .5) no-repeat center center;
 
  background-blend-mode: multiply;
 
  }
 
  拓展:背景模糊加颜色叠加
 
  .wrap4 {
 
  position: relative;
 
  width: 1200px;
 
  height: 400px;
 
  background: url(ban8.jpg) rgba(0, 0, 0, .5) no-repeat center center;
 
  background-blend-mode: multiply;
 
  filter: blur(2px);
 
  overflow: hidden;
 
  }
 
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