javascript – 连续背景图像模式的几个元素

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我需要在几个元素上形成连续的背景模式.
我无法控制元素的高度或数量.
这是一个例子：

p{
  margin:0;
  padding:1.5em;
}
.bg{
  background-image:url('http://enjoycss.com/webshots/hB_1.png');
}

<p>some text<br>on several lines</p>
<p class="bg">some text<br>on several lines</p>
<p class="bg">some text<br>on several lines<br><br>and another<br>some text<br>on several lines<br><br>and another</p>
<p class="bg">some text<br>on several lines<br><br>and another</p>
<p>some text<br>on several lines<br><br>and another<br>some text<br>on several lines<br><br>and another</p>
<p class="bg">some text<br>on several lines</p>
<p class="bg">some text<br>on several lines<br><br>and another<br>some text<br>on several lines<br><br>and another</p>
<p class="bg">some text<br>on several lines<br><br>and another</p>

我正在寻找的效果几乎是通过background-attachement实现的：fixed;但是我需要背景来滚动内容.
例：

p{
  margin:0;
  padding:1.5em;
}
.bg{
  background-image:url('http://enjoycss.com/webshots/hB_1.png');
  background-attachment:fixed;
}

<p>some text<br>on several lines</p>
<p class="bg">some text<br>on several lines</p>
<p class="bg">some text<br>on several lines<br><br>and another<br>some text<br>on several lines<br><br>and another</p>
<p class="bg">some text<br>on several lines<br><br>and another</p>
<p>some text<br>on several lines<br><br>and another<br>some text<br>on several lines<br><br>and another</p>
<p class="bg">some text<br>on several lines</p>
<p class="bg">some text<br>on several lines<br><br>and another<br>some text<br>on several lines<br><br>and another</p>
<p class="bg">some text<br>on several lines<br><br>and another</p>

解决方法:

使用Javascript

使用少量JavaScript,您可以获得所需的效果.

此方法获取当前高度并添加所有先前的高度,以便为元素提供其起始背景位置.

var lastHeight = 0;
$('.bg').each(function() {
  $(this).css('background-position', '0 -' + lastHeight + 'px');
  var currentHeight = $(this).outerHeight();
  var newPosition = currentHeight + lastHeight;
  lastHeight = lastHeight + currentHeight;
});

p {
  margin: 0;
  padding: 1.5em;
}
.bg {
  background-image: url('http://enjoycss.com/webshots/hB_1.png');
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<p>some text<br>on several lines</p>
<p class="bg">some text<br>on several lines</p>
<p class="bg">some text<br>on several lines<br><br>and another<br>some text<br>on several lines<br><br>and another</p>
<p class="bg">some text<br>on several lines<br><br>and another</p>
<p>some text<br>on several lines<br><br>and another<br>some 
<p class="bg">some text<br>on several lines</p>
<p class="bg">some text<br>on several lines<br><br>and another<br>some text<br>on several lines<br><br>and another</p>
<p class="bg">some text<br>on several lines<br><br>and another</p>
<p>some text<br>on several lines<br><br>and another<br>some text<br>on several lines<br><br>and another</p>

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