我有一个正在使用Puppeteer测试的React / Redux应用程序。根据文档,我使用以下代码显示控制台输出:
JSHandle@object
但是,当redux-logger将对象记录到控制台(prevState,nextState)时,Puppeeter会在控制台输出中显示bazel build --cxxopt='--std=c++11' -c opt --fat_apk_cpu=x86,x86_64,arm64-v8a,armeabi-v7a tensorflow/contrib/lite/java:tensorflow-lite
。如何查看该对象内部的键和属性?
答案 0 :(得分:3)
您可以通过 args
从 JSHandle
获得 await
。
对我来说最好的方法是描述来自浏览器的错误并捕获所需类型的 console
通知:
import { ConsoleMessage, Page, JSHandle } from 'puppeteer';
const chalk = require('chalk');
export const listenPageErrors = async (page: Page) => {
// make args accessible
const describe = (jsHandle) => {
return jsHandle.executionContext().evaluate((obj) => {
// serialize |obj| however you want
return `OBJ: ${typeof obj}, ${obj}`;
}, jsHandle);
}
const colors: any = {
LOG: chalk.grey, // (text: any) => text,
ERR: chalk.red,
WAR: chalk.yellow,
INF: chalk.cyan,
};
// listen to browser console there
page.on('console', async (message: ConsoleMessage) => {
const args = await Promise.all(message.args().map(arg => describe(arg)));
// make ability to paint different console[types]
const type = message.type().substr(0, 3).toUpperCase();
const color = colors[type] || chalk.blue;
let text = '';
for (let i = 0; i < args.length; ++i) {
text += `[${i}] ${args[i]} `;
}
console.log(color(`CONSOLE.${type}: ${message.text()}\n${text} `));
});
}
把它放在const page = await browser.newPage();
和page.goto(URL)
之间,它会正常工作
const page = await browser.newPage();
await listenPageErrors(page); // <- like there
page.goto(URL)
答案 1 :(得分:1)
如果将consoleMessage.args()
直接放置在console.log()
内而不将其括在template literals中,则可以打印表示传递给{的每个参数的JSHandles的键和值{3}}在页面上下文中:
page.on('console', msg => {
for (let i = 0; i < msg.args().length; i++) {
console.log(msg.args()[i]);
}
});
结果的开始看起来像这样:
JSHandle {
_context:
ExecutionContext {
_client:
CDPSession {
domain: null,
_events: [Object],
...