javascript - A small question about classes, please answer?
The browser pop-up is always different from the one in the book. I don’t understand. Logically speaking, it should be 1. Why did it show 0 when I tried it?
code show as below:
<!DOCTYPE html>
<html>
<body>
<p class="example">123</p>
<p class="example">123</p>
<p class="example">123</p>
<p>456</p>
<p id="demo"></p>
<script>
alert(document.getElementsByClassName("example").length);
</script>
</body>
</html>
