JQuery段落中突出显示的单词

Question

我想做一个文本荧光笔：我的段落在qtext，我想在段落中突出显示的单词在answerCodes。我想为它们添加一个跨度类并在段落中突出显示它们。任何想法都会有所帮助！

    var answerCodes = $('[id*="_label"]').text(); 
    var qText = $('.question_text').html();
    for (var i=0; i<answerCodes.length; i++) {
        need to put something here...
    }   

Answer 1

根据答案码生成正则表达式，替换html内容。

// generate regex
var reg = new RegExp(
  // get all answer code elements
  $('[id*="_label"]')
  // iterate over them
  .map(function() {
    // get text content and
    // escape symbols which has special meaning in regex
    return $(this).text().replace(/[|\\{}()[\]^$+*?.]/g, '\\$&');    
  })
  // get result as array
  .get()
  // join them with pipe symbol
  .join('|'),
  // set global modifier for global match
  'g');


// iterate over p
$('.question_text').html(function(i, html) {
  // replace the question code with span wrapped content
  return html.replace(reg, '<span class="highliter">$&</span>');
});

var reg = new RegExp(
  $('[id*="_label"]').map(function() {
    return $(this).text().replace(/[|\\{}()[\]^$+*?.]/g, '\\$&');
  }).get().join('|'), 'g');


$('.question_text').html(function(i, html) {
  return html.replace(reg, '<span class="highliter">$&</span>');
});

.highliter {
  color: red
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<label id="_label1">abc</label>
<label id="_label1">test</label>

<div class="question_text">a a a a abc bb b test dd abc fff</div>

Answer 2

使用 RegExp 替换。

for (var i=0; i< answerCodes.length; i++) {
    qText = qText.replace(new RegExp(answerCodes[0], 'g'), '<span class="highlight">$1</span>');
}