20 lines
345 B
JavaScript
20 lines
345 B
JavaScript
export default function contains(root, n) {
|
|
if (!root) {
|
|
return false;
|
|
}
|
|
|
|
// Use native if support
|
|
if (root.contains) {
|
|
return root.contains(n);
|
|
}
|
|
|
|
// `document.contains` not support with IE11
|
|
let node = n;
|
|
while (node) {
|
|
if (node === root) {
|
|
return true;
|
|
}
|
|
node = node.parentNode;
|
|
}
|
|
return false;
|
|
} |