javascript - JavaScript 中不区分大小写的搜索

Question

我有这段 JavaScript 代码，应该在特定的时间后刷新给定的网页，并尝试在每次刷新后查找某个单词。当找到这个词时，就会发出某种令人震惊的声音。这是代码:

javascript:
  var myRegExp = prompt("the word");
timeout = prompt("the time in seconds");
current = location.href;
setTimeout('reload()', 1000 * timeout);
var audio = new Audio('http://soundbible.com/grab.php?id=2197&type=mp3');

function reload() {
  var found = searchText();
  if (!found) {
    setTimeout('reload()', 1000 * timeout);
    fr4me = '<frameset cols=\'*\'>\n<frame id="frame01" src=\'' + current + '\'/>';
    fr4me += '</frameset>';
    with(document) {
      write(fr4me);
      void(close())
    };
  }
}

function searchText() {
  var f = document.getElementById("frame01");
  if (f != null && f.contentDocument != null) {
    var t = f.contentDocument.body.innerHTML;
    var matchPos = t.search(myRegExp);
    if (matchPos != -1) {
      audio.play();

      return true;
    } else {
      return false;
    }
  }
}

我的问题/请求是，如何使搜索单词大小写不敏感？

Answer 1

使用ignoreCase选项来自 MDN

The ignoreCase property indicates whether or not the "i" flag is used with the regular expression. ignoreCase is a read-only property of an individual regular expression instance.

var regex1 = new RegExp('foo');
var regex2 = new RegExp('foo', 'i');

console.log(regex1.test('Football'));
// expected output: false

console.log(regex2.ignoreCase);
// expected output: true

console.log(regex2.test('Football'));
// expected output: true