js操作DOM

js节点迭代器

        function getChildren(parent){
            //1.创建节点迭代器对象
            let iterator = document.createNodeIterator(
                parent, NodeFilter.SHOW_ELEMENT, null, false
            );
            //2.反复调用iterator的nextNode方法跳到下一个
            do{
                let node = iterator.nextNode();
                if(node != null)
                    console.log(node.nodeName);
                else
                    break;
            }while(true);
        }

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4种查询方式

document.getElementById()
parent.getElementsByTagName()
document.getElementsByName()
parent.getElementsByClassName()