匹配关键字变红

<div class="title" >
<span v-html="brightenKeyword(items.title, keyword)" ></span>
</div>

 brightenKeyword(val, keyword) {
    val = val + '';
    if (val.indexOf(keyword) !== -1 && keyword !== '') {
      return val.replace(keyword, '<font color="red">' + keyword + '</font>')
    } else {
      return val
    }
  },