javascript - 类似于 Puppeteer 中的 document.ready() 的功能？

Question

Puppeteer 中是否有类似document.ready() 的东西？

有:

page.waitForSelector(selector)

既然在任何HTML页面上都有那么多同名选择器，那么这个函数怎么能确定加载了正确的页面呢？这是一个简单的函数，但是当我在 page.content() 之前使用它时导致了很多错误。我不确定这个函数遗漏了什么。

Answer 1

您可以使用 page.waitForNavigation()作为 jQuery 的 document.ready() 的替代品功能:

await page.waitForNavigation({waitUntil: 'load'});             // consider navigation to be finished when the load event is fired.
await page.waitForNavigation({waitUntil: 'domcontentloaded'}); // consider navigation to be finished when the DOMContentLoaded event is fired.
await page.waitForNavigation({waitUntil: 'networkidle0'});     // consider navigation to be finished when there are no more than 0 network connections for at least 500 ms.
await page.waitForNavigation({waitUntil: 'networkidle2'});     // consider navigation to be finished when there are no more than 2 network connections for at least 500 ms.

或者，您可以使用 page.goto() 中的 waitUntil 选项等待文档加载:

await page.goto('https://example.com/', {waitUntil: 'load'});
await page.goto('https://example.com/', {waitUntil: 'domcontentloaded'});
await page.goto('https://example.com/', {waitUntil: 'networkidle0'});
await page.goto('https://example.com/', {waitUntil: 'networkidle2'});