JavaScript DOM操作, 啥时候同步更新?
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.red {
color: red;
}
.green {
color: green;
}
</style>
</head>
<body>
<ul>
<li class="red">哈哈0</li>
<li class="red">哈哈1</li>
<li class="red">哈哈2</li>
<li class="red">哈哈3</li>
<li class="red">哈哈4</li>
</ul>
<script>
var liArr = document.getElementsByClassName('red');//一绿一红
// var liArr = document.querySelectorAll('.red');//全绿
for (var i = 0; i < liArr.length; i++) {
liArr[i].className = 'green';
}
</script>
</body>
</html>
感谢各位指点,找到问题答案了.
后面是一个小结:
https://icbd.github.io/wiki/w...
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JavaScript