JS如何删除节点和所有子节点

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]);

}