代码

/**
 * @param {HTMLElement} node
 * @param {HTMLElement} parent
 * @return {Boolean} found
 */
function hasParent(node, parent) {
  while (node) {
    if (node === parent) {
      return true;
    }
    node = node.parentNode;
  }
  return false;
}

实例

html

<div id="img" style="border: 1px solid red">
      <h3 id="testStr" style="color: #000">sdjfosjdf</h3>
</div>
<div class="node1" style="color: red"><h1>这是另外的标签</h1></div>

js

const node = document.getElementById('img')
function callback(e){
  console.log('hasParent(e.target, node)',hasParent(e.target, node))
}
window.addEventListener('click', callback)

说明：

• 点击h3标签或者id为img的div返回true. 其余返回false