获取DOM树节点对象

// 获取dom树
var getElement = (node, array) => {
    if (node && node.nodeType ===1){
        array.push(node.tagName)
    }
    for (let i=0;i<node.childNodes.length;i++){
        if(node.childNodes[i].nodeType ===1){
            getElement(node.childNodes[i], array)
        }
    }
}
window.onload = ()=>{
    let html = document.getElementsByTagName('html')[0]
    let array = []
    getElement(html, array)
    console.log(array)
}