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

Question

Puppeteer 中有类似document.ready() 的东西吗？

有：

page.waitForSelector(selector)

既然任何一个 HTML 页面上都有这么多同名选择器，那么这个函数怎么能确定正确的页面已经加载呢？这是一个简单的功能，但是在page.content()之前使用它时引起了很多错误。我不确定这个函数有什么遗漏。

Answer 1

您可以使用page.waitForNavigation() 替代jQuery 的document.ready() 函数：

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'});