复制
1
2const box = document.getElementById('box');
3
4function isIcon(target) {
5 return target.className.includes('icon');
6}
7
8box.onclick = function(e) {
9 e.stopPropagation();
10 const target = e.target;
11 if (isIcon(target)) {
12   target.style.border = '1px solid red';
13 }
14}
15
16const doc = document;
17
18doc.onclick = function(e) {
19 const children = box.children;
20 for(let i = 0; i < children.length; i++) {
21   if (isIcon(children[i])) {
22     children[i].style.border = 'none';
23   }
24 }
25}