Function getXpath

Zhihu-Enhanced.user.js:1467–1476

(xpath, contextNode, doc = document)

function getXpath(xpath, contextNode, doc = document) {
    contextNode = contextNode || doc;
    try {
        const result = doc.evaluate(xpath, contextNode, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null);
        // 应该总是返回一个元素节点
        return result.singleNodeValue && result.singleNodeValue.nodeType === 1 && result.singleNodeValue;
    } catch (err) {
        throw new Error(`无效 Xpath: ${xpath}`);
    }
}


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