childNodes遍历DOM节点树

childNodes遍历DOM节点树

var s = "";
function travel(space,node) {
    if(node.tagName){
        s += space + node.tagName + "</br>"
    }
    var len = node.childNodes.length
    for (var i=0; i<len; i++){
        travel(space+"--",node.childNodes[i])
    }
}
travel("*", document)
document.write(s);