JavaScript/jQuery getSelection突出显示合并span-html元素

Question

function highlight_text(sel) {
  span = htmlSpanHlt();
  if (sel.getRangeAt) {
    range = sel.getRangeAt(0);
  }
  span.appendChild(range.extractContents());
  range.insertNode(span);
}
function htmlSpanHlt() {
  element = document.createElement("span");
  element.setAttribute('class', 'hlt');
  return element;
}

.hlt {
 background: yellow; 
}

<div class="highlight">
  <p>
    <span class="hlt">Lorem</span> ipsum dolor sit amet, zril accusata postulant at ius. Dicat etiam luptatum ea pri. Duo docendi vulputate dissentiet ut, tollit bonorum duo eu. Maiorum adolescens scriptorem usu eu, sit idque facer causae ei. Choro nostrum at pro, sumo essent suscipiantur pri ex. Quo case veritus definiebas eu, sit postulant dissentias ei.<br>
    <br>
    Mel cu porro decore, cum et simul recteque inciderint. His ne omnes sententiae, ut omittantur dissentiet accommodare sed. Pro minim necessitatibus ne, no malis integre quo. Sed utroque molestiae interpretaris ne. Oportere indoctum at has, te sale semper eum, ea nam vitae dissentiet.
  </p>
</div>

单词"Lorem"有一个类名"hlt"，它已经被突出显示了。我想要的是：如果我想突出显示另一个文本，包括单词"Lorem"w/c已经突出显示。我想合并他们的span-html元素。示例：如果我在单词"Lorem"旁边突出显示"ipsum"，并且我还包括"Lorem"，则结果将是Lorem ipsum。有人能帮我吗？谢谢你。

Answer 1

这个怎么样？

function highlight_text(sel) {
   var hlt_element = document.getElementsByClassName('hlt')[0];
   if (!hlt_element || sel.containsNode(hlt_element,true)) {
      add_hlt_element(sel);
   }
}
function add_hlt_element(sel) {
   var element = document.createElement("span");
   var range = sel.getRangeAt(0);
   element.setAttribute('class', 'hlt');
   element.innerHTML = sel.toString().replace(/(?:rn|r|n)/g, '<br />n');
   range.deleteContents();
   range.insertNode(element); 
   var highlight_div = document.getElementsByClassName("highlight")[0];
   highlight_div.innerHTML = highlight_div.innerHTML.replace('</span><span class="hlt">','');
}
window.onmouseup = function() {
   var sel = window.getSelection();
   highlight_text(sel);
}

.hlt {
    background: yellow; 
}

<div class="highlight">
  <p>
    Lorem ipsum dolor sit amet, zril accusata postulant at ius. Dicat etiam luptatum ea pri. Duo docendi vulputate dissentiet ut, tollit bonorum duo eu. Maiorum adolescens scriptorem usu eu, sit idque facer causae ei. Choro nostrum at pro, sumo essent suscipiantur pri ex. Quo case veritus definiebas eu, sit postulant dissentias ei.<br>
    <br>
    Mel cu porro decore, cum et simul recteque inciderint. His ne omnes sententiae, ut omittantur dissentiet accommodare sed. Pro minim necessitatibus ne, no malis integre quo. Sed utroque molestiae interpretaris ne. Oportere indoctum at has, te sale semper eum, ea nam vitae dissentiet.
  </p>
</div>