javascript - 为什么用户选择会呈现在屏幕上？

Question

我正在尝试务实地创建用户选择。 Here is the plunker 。这是简单的设置:

<p>Tim O'Reilly calls for a Blogger Code of Conduct. His proposals are:</p>
<ol>
    <li>Take responsibility not just for your own words, but for the
        comments you allow on your blog.</li>
    <li>Label your tolerance level for abusive comments.</li>
    <li>Consider eliminating anonymous comments.</li>
</ol>

<script>
    var range = document.createRange();
    var startPar = document.querySelector('p').firstChild;
    var endLi = document.querySelector('li:nth-child(2)').firstChild;
    range.setStart(startPar,13);
    range.setEnd(endLi,17);
    console.log(range.toString());
</script>

一切似乎都工作正常，我得到了控制台的预期输出，但是屏幕上未选择文本。这是设计使然吗？

Answer 1

您已经找到了范围，但现在您需要告诉浏览器选择它。示例:

var sel = window.getSelection();
sel.removeAllRanges();
sel.addRange(range);