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