更改背景颜色

为偶数索引的幻灯片设置蓝色背景，奇数索引的幻灯片设置图片背景。

(function()
{
    let presentation = Api.GetPresentation(); 
    let slidesCount = presentation.GetSlidesCount();
    
    // 创建背景颜色和纯色填充
    let backgroundColor = Api.CreateRGBColor(0, 150, 255);
    let colorFill = Api.CreateSolidFill(backgroundColor);

    // 从图片创建图片填充
    let imageUrl = "https://static.onlyoffice.com/assets/docs/samples/img/presentation_sky.png";
    let imageFill = Api.CreateBlipFill(imageUrl, "stretch");
    
    // 遍历每一张幻灯片
    for (let i = 0; i < slidesCount; i++) {
        let slide = presentation.GetSlideByIndex(i);
        if(i % 2 == 0) {
            // 如果幻灯片索引为偶数，则设置颜色为背景
            slide.SetBackground(colorFill);
        } else {
            // 如果幻灯片索引为奇数，则设置图片为背景
            slide.SetBackground(imageFill);
        }
     }
})();

使用方法： GetPresentation, GetSlidesCount, CreateRGBColor, CreateSolidFill, CreateBlipFill, GetSlideByIndex, SetBackground

参考 Microsoft VBA 宏代码

Sub SetSlideBackground()
    Dim slide As Slide
    Dim slideIndex As Integer
    Dim slidesCount As Integer
    Dim backgroundColor As Long
    Dim imageUrl As String
    Dim picture As Object
    Dim backgroundShape As Object
    
    ' 获取当前幻灯片
    Dim presentation As Presentation
    Set presentation = ActivePresentation
    
    ' 获取幻灯片总数
    slidesCount = presentation.Slides.Count
    
    ' 设置背景颜色的 RGB 值 (R = 0, G = 150, B = 255)
    backgroundColor = RGB(0, 150, 255)
    
    ' 设置图片的 URL
    imageUrl = "https://static.onlyoffice.com/assets/docs/samples/img/presentation_sky.png"
    
    ' 遍历每张幻灯片
    For slideIndex = 1 To slidesCount
        Set slide = presentation.Slides(slideIndex)
        
        ' 判断幻灯片索引是偶数还是奇数
        If slideIndex Mod 2 = 0 Then
            ' 如果是偶数，设置纯色背景
            slide.FollowMasterBackground = msoFalse
            slide.Background.Fill.BackColor.RGB = backgroundColor
        Else
            ' 如果是奇数，设置图片背景
            slide.FollowMasterBackground = msoFalse
            
            ' 若背景图片存在，则删除已有的背景图片
            On Error Resume Next
            slide.Shapes("background_image").Delete
            On Error GoTo 0
            
            ' 将图片添加到幻灯片
            Set picture = slide.Shapes.AddPicture(imageUrl, _
                                                   MsoTriState.msoFalse, _
                                                   MsoTriState.msoTrue, _
                                                   0, 0)
            
            ' 拉伸图片以覆盖整个幻灯片
            picture.LockAspectRatio = MsoTriState.msoFalse
            picture.Width = slide.Master.Width
            picture.Height = slide.Master.Height
            picture.Top = 0
            picture.Left = 0
            picture.Name = "background_image"
        End If
    Next slideIndex
    
    MsgBox "幻灯片背景已更新！"
End Sub

结果