如果不同的Java泛型类型参数具有相同的名称，为什么可以分配不同的类型？(If different Java generic type parameter have the same name, why it can be assigned different types?)

 waitFor函数接受选择器，函数或超时。 如果你想看看url是否等于某个东西，那就为它写一个函数。 将url作为参数传递，以便在浏览器上下文中阅读它。 
 
const url = await page.url();
await page.waitFor((url)=> url === 'http://localhost:3000/blogs', url); // <-- use a function
 
 您也可以使用内置代码构建的浏览器等待url匹配。 
 
await page.waitFor(()=> location.href === 'http://localhost:3000/blogs');
 
 请注意，由于您正在使用===来匹配字符串，因此请确保包含http://因为location.href将使用协议输出网址。 
 
 如果你想使用笑话，那么你可以使用expect并将其包装在一个块中。 
 
it('should contain specific url', async () => {
    const url = await page.url();
    expect(url).toContain('localhost:3000/blogs');
});
 
 这是一个供玩笑和木偶一起使用的文件。 

The waitFor function accepts a selector, function or timeout. If you want to see if url is equal to something, then write a function for it. Pass the url as an argument so you can read it within the browser context.
 
const url = await page.url();
await page.waitFor((url)=> url === 'http://localhost:3000/blogs', url); // <-- use a function
 
Also you can use browsers built in code to wait for url to match. 
 
await page.waitFor(()=> location.href === 'http://localhost:3000/blogs');
 
Note, since you are using === to match a string, make sure to include http:// since location.href will output the url with the protocol. 
 
If you want to use jest, then you can use expect and wrap it in a it block.
 
it('should contain specific url', async () => {
    const url = await page.url();
    expect(url).toContain('localhost:3000/blogs');
});
 
Here is a document for jest and puppeteer together.