我想立即获取 Div 内每个元素的每个 ID，并更改它们的所有类名。喜欢：
<div id = "container">
<div id = "alot"></div>
<div id = "of"></div>
<div id = "random"></div>
<div id = "ids"></div>
</div>
<script>
var everyId = //all of the ids in #container. but how ?
document.getElementById( everyId ).className = "anything";
</script>
我见过使用库的解决方案，但这可以用纯 Javascript 实现吗？
尝试这样的事情：
var ids = [];
var children = document.getElementById("container").children; //get container element children.
for (var i = 0, len = children.length ; i < len; i++) {
children[i].className = 'new-class'; //change child class name.
ids.push(children[i].id); //get child id.
}
console.log(ids);
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