SharePoint online 默认是现代视图，我们可以通过Powershell命令切换默认视图。

　　以下，是完成的Powershell命令：

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# This file uses CSOM. Replace the paths below with the path to CSOM on this computer.
# If CSOM is in the user's downloads folder, you only have to replace the <username> placeholder.

Add-Type -Path "C:\Users\<username>\downloads\Microsoft.SharePointOnline.CSOM.16.1.5026.1200\lib\net45\Microsoft.SharePoint.Client.dll"
Add-Type -Path "C:\Users\<username>\downloads\Microsoft.SharePointOnline.CSOM.16.1.5026.1200\lib\net45\Microsoft.SharePoint.Client.Runtime.dll"

# All strings in braces < >are placeholders that you must replace with the appropriate strings.

$webUrl = 'https://<domain>.sharepoint.com/<relative-path-to-website>'
$username = '<username>@<domain>.onmicrosoft.com'
$password = Read-Host -Prompt "Password for $username" -AsSecureString

[Microsoft.SharePoint.Client.ClientContext]$clientContext = New-Object Microsoft.SharePoint.Client.ClientContext($webUrl)
$clientContext.Credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($username, $password)
$site = $clientContext.Site;
$customActions = $site.UserCustomActions
$clientContext.Load($customActions)
$clientContext.ExecuteQuery()

$first = $true
foreach($customAction in $customActions)
{
if($customAction.Location -eq "scriptlink" -and -Not ([string]::IsNullOrEmpty($customAction.ScriptBlock)))
{
if ($first)
{
Echo " "
Echo ($webUrl + " has the following inline JavaScript custom actions")
$first = $false
}
Echo $customAction.Title
}
}

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　　如果保存ps1文件，请注意

Note: You can use a different file name, but you must save the file as an ANSI-encoded text file whose extension is .ps1