如何在javascript中查找Xpath by元素

// 创建XPath表达式
var xpathExpr = "//div[@class='example']";

// 获取文档根节点
var doc = document;
var rootNode = doc.documentElement;

// 创建XPathEvaluator对象
var evaluator = new XPathEvaluator();

// 执行XPath查询
var result = evaluator.evaluate(xpathExpr, rootNode, null, XPathResult.ORDERED_NODE_ITERATOR_TYPE, null);

// 遍历结果节点
var node;
while (node = result.iterateNext()) {
  // 处理匹配到的节点
  console.log(node.textContent);
}

// 如果需要返回单个节点，可以使用XPathResult.FIRST_ORDERED_NODE_TYPE作为结果类型
var singleResult = evaluator.evaluate(xpathExpr, rootNode, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null);
var singleNode = singleResult.singleNodeValue;
console.log(singleNode.textContent);