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HTML

            
              <p>local 背景相对于元素的内容固定，如果元素可滚动，则背景将会随着元素的内容滚动</p>
<div class="demo local ">
  <h3 class="title">将进酒</h3>
  <p class="desc">君不见，黄河之水天上来，奔流到海不复回。</p>
  <p class="desc">君不见，高堂明镜悲白发，朝如青丝暮成雪。</p>
  <p class="desc">人生得意须尽欢，莫使金樽空对月。</p>
  <p class="desc">天生我材必有用，千金散尽还复来。</p>
  <p class="desc">烹羊宰牛且为乐，会须一饮三百杯。</p>
  <p class="desc">岑夫子，丹丘生，将进酒，杯莫停。</p>
  <p class="desc">与君歌一曲，请君为我倾耳听。</p>
  <p class="desc">钟鼓馔玉不足贵，但愿长醉不复醒。</p>
  <p class="desc">古来圣贤皆寂寞，惟有饮者留其名。</p>
  <p class="desc">陈王昔时宴平乐，斗酒十千恣欢谑。</p>
  <p class="desc">主人何为言少钱，径须沽取对君酌。</p>
  <p class="desc">五花马，千金裘，呼儿将出换美酒，与尔同销万古愁。</p>
</div>

<p>scroll 背景相对于元素本身固定，如果元素可滚动，背景不随着内容滚动</p>
<div class="demo scroll">
  <h3 class="title">将进酒</h3>
  <p class="desc">君不见，黄河之水天上来，奔流到海不复回。</p>
  <p class="desc">君不见，高堂明镜悲白发，朝如青丝暮成雪。</p>
  <p class="desc">人生得意须尽欢，莫使金樽空对月。</p>
  <p class="desc">天生我材必有用，千金散尽还复来。</p>
  <p class="desc">烹羊宰牛且为乐，会须一饮三百杯。</p>
  <p class="desc">岑夫子，丹丘生，将进酒，杯莫停。</p>
  <p class="desc">与君歌一曲，请君为我倾耳听。</p>
  <p class="desc">钟鼓馔玉不足贵，但愿长醉不复醒。</p>
  <p class="desc">古来圣贤皆寂寞，惟有饮者留其名。</p>
  <p class="desc">陈王昔时宴平乐，斗酒十千恣欢谑。</p>
  <p class="desc">主人何为言少钱，径须沽取对君酌。</p>
  <p class="desc">五花马，千金裘，呼儿将出换美酒，与尔同销万古愁。</p>
</div>

<p>fixed 背景相对于视口固定，如果元素可滚动，背景不随着元素的内容滚动</p>
<div class="demo fixed">
  <h3 class="title">将进酒</h3>
  <p class="desc">君不见，黄河之水天上来，奔流到海不复回。</p>
  <p class="desc">君不见，高堂明镜悲白发，朝如青丝暮成雪。</p>
  <p class="desc">人生得意须尽欢，莫使金樽空对月。</p>
  <p class="desc">天生我材必有用，千金散尽还复来。</p>
  <p class="desc">烹羊宰牛且为乐，会须一饮三百杯。</p>
  <p class="desc">岑夫子，丹丘生，将进酒，杯莫停。</p>
  <p class="desc">与君歌一曲，请君为我倾耳听。</p>
  <p class="desc">钟鼓馔玉不足贵，但愿长醉不复醒。</p>
  <p class="desc">古来圣贤皆寂寞，惟有饮者留其名。</p>
  <p class="desc">陈王昔时宴平乐，斗酒十千恣欢谑。</p>
  <p class="desc">主人何为言少钱，径须沽取对君酌。</p>
  <p class="desc">五花马，千金裘，呼儿将出换美酒，与尔同销万古愁。</p>
</div>
!

CSS

            
              * {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

.demo {
  width: 500px;
  height: 320px;
  margin: 32px auto;
  background: url('http://www.daqianduan.com/wp-content/uploads/2018/11/13bb479bd1c0698968cba60885b6215c.jpg') no-repeat top center;
  overflow-y: scroll; 
}

.title,
.desc{
  text-align: center;
  color: #fff;
}

.title {
  margin-bottom: 24px;
}

.desc {
  margin-bottom: 8px;
}

.local {
  background-attachment: local;
}

.scroll {
  background-attachment: scroll;
}

.fixed {
  background-attachment: fixed;
}
!

JS
!
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