如何在上傳圖片前預覽圖片?

VBProtected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.LoadFileUpload1.Attributes.Add("onchange", "document.getElementById('" + Image1.ClientID + "').src=document.getElementById('" + FileUpload1.ClientID + "').value")End Sub
C#Page_Load(){this.FileUpload1.Attributes.Add("onchange", "document.getElementById('" + this.Image1.ClientID + "').src=document.getElementById('" + this.FileUpload1.ClientID + "').value");}
JAVASCRIP