JS库 Highlightjs 添加代码行号的实现代码

//numbering for pre>code blocks
$(function(){
  $('pre code').each(function(){
    var lines = $(this).text().split('\n').length - 1;
    var $numbering = $('<ul/>').addClass('pre-numbering');
    $(this)
      .addClass('has-numbering')
      .parent()
      .append($numbering);
    for(i=1;i<=lines;i++){
      $numbering.append($('<li/>').text(i));
    }
  });
});

pre {
  position: relative;
  margin-bottom: 24px;
  border-radius: 3px;
  border: 1px solid #C3CCD0;
  background: #FFF;
  overflow: hidden;
}
code {
 display: block;
 padding: 12px 24px;
 overflow-y: auto;
 font-weight: 300;
 font-family: Menlo, monospace;
 font-size: 0.8em;
}
code.has-numbering {
  margin-left: 21px;
}
.pre-numbering {
  position: absolute;
  top: 0;
  left: 0;
  width: 20px;
  padding: 12px 2px 12px 0;
  border-right: 1px solid #C3CCD0;
  border-radius: 3px 0 0 3px;
  background-color: #EEE;
  text-align: right;
  font-family: Menlo, monospace;
  font-size: 0.8em;
  color: #AAA;
}