1. 删除Id为demo节点
var element=document.getElementById("demo");
element.parentNode.removeNode(element);
2. 删除class类名为demo的所有节点
var elements = document.getElementsByClassName('demo');
for(var i = elements.length - 1; i >= 0; i--) {
elements[i].parentNode.removeChild(elements[i]);
}
3. 删除Id为demo下的所有子节点
var el = document.getElementById('demo');
var childs = el.childNodes;
for(var i = childs .length - 1; i >= 0; i--) {
el.removeChild(childs[i]);
}
