在脚本中使用 GetElementsByClassName [英] Use GetElementsByClassName in a script

问题描述

我正在尝试编写一个 PowerShell 脚本，以从网站上获取所有名为newstitle"的类中的文本.

I'm trying to write a PowerShell script to get the text within all the classes named "newstitle" from a website.

这就是我所拥有的:

function check-krpano {
    $geturl=Invoke-WebRequest http://krpano.com/news/
    $news=$geturl.parsedhtml.body.GetElementsByClassName("newstitle")[0]
    Write-Host  "$news"
}

check-krpano

它显然需要更多的调整，但到目前为止，它不起作用.

It obviously needs much more tweaking, but so far, it doesn't work.

我设法使用 GetElementById 编写了一个脚本，但我不知道 GetElementsByClassName 的语法，老实说，我没有找到太多关于它的信息.

I managed to write an script using GetElementById, but I don't know the syntax for GetElementsByClassName, and to be honest, I haven't been able to find much information about it.

注意:

我已经勾选了我问题的正确答案，但这不是我选择在脚本中使用的解决方案.

I've ticked the right answer to my question, but that's not the solution that I had chose to use in my script.

虽然我可以使用 2 种方法在包含某个类的标签中找到内容，但它们比搜索链接要慢得多.

Although I was able to find the content within a tag containing a certain class, using 2 methods, they were much slower that searching for links.

这是使用 Measure-Command 的输出:

Here is the output using Measure-Command:

• 使用 parsedhtml.body 搜索包含newstitle"类的 div -> 29.6 秒
• 使用 Allelements 搜索包含类newstitle"的开发者 -> 10.4 秒
• 搜索其元素 'href' 包含 #news 的链接 -> 2.4 秒

所以我将链接方法的答案标记为有用.

So I have marked as useful the Links method answer.

这是我的最终脚本:

function check-krpano {
    Clear-Host
    $geturl=Invoke-WebRequest http://krpano.com/news
    $news = ($geturl.Links |Where href -match '\#news\d+' | where class -NotMatch 'moreinfo+' )
    $news.outertext | Select-Object -First 5
}

check-krpano

推荐答案

如果你想知道如何让 GetElementsByClassName 工作，我想知道.我昨天刚遇到这个，时间不够了，所以我想出了一个解决方法:

If you figure out how to get GetElementsByClassName to work, I'd like to know. I just ran into this yesterday and ran out of time so I came up with a workaround:

$geturl.ParsedHtml.body.getElementsByTagName('div') | 
    Where {$_.getAttributeNode('class').Value -eq 'newstitle'}

这篇关于在脚本中使用 GetElementsByClassName的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！