在puppeteer中使用devtool-protocol获取所有样式 [英] Getting all styles with devtool-protocol in puppeteer

问题描述

我正在尝试获取页面上所有节点的所有样式，为此，我想使用

I'm trying to get all styles for all nodes on page and for that i want to use CSS.getMatchedStylesForNode from devtool-protocol, but its only working for one node. If loop through an array of nodes i get a lot of warning in console(code below) and nothing is returned. What i'm doing wrong ?

在控制台中警告:

(node:5724) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 11): Error: Protocol error (CSS.getMatchedStylesForNode): Target closed.

我的代码

'use strict';

const puppeteer = require('puppeteer');

(async () => {
    const browser = await puppeteer.launch();
    const page = await browser.newPage();
    await page.goto('https://example.com');
    await page._client.send('DOM.enable');
    await page._client.send('CSS.enable');
    const doc = await page._client.send('DOM.getDocument');
    const nodes = await page._client.send('DOM.querySelectorAll', {
        nodeId: doc.root.nodeId,
        selector: '*'
    });

    const styleForSingleNode = await page._client.send('CSS.getMatchedStylesForNode', {nodeId: 3});
    const stylesForNodes = nodes.nodeIds.map(async (id) => {
        return await page._client.send('CSS.getMatchedStylesForNode', {nodeId: id});
    });

    console.log(JSON.stringify(stylesForNodes));
    console.log(JSON.stringify(styleForSingleNode));

    await browser.close();
})();

• 木偶版本:0.13.0
• 平台:窗口10
• 节点:8.9.3

推荐答案

使用for循环

const stylesForNodes = []
for (id of nodes.nodeIds) {
  stylesForNodes.push(await page._client.send('CSS.getMatchedStylesForNode', {nodeId: id}));
}

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