JS control fileupload Upload File type instance code _javascript tips

The JS code is as follows:

function Checkfile (obj) { 
  var array = new Array (' GIF ', ' jpeg ', ' png ', ' jpg ');//Can be uploaded file type 
  if (Obj.value = = ") {
  alert ("Let's choose the picture to upload!"); 
    return false; 
  } 
  else { 
    var filecontenttype = Obj.value.match (/^ (. *) (\.) (. {1,8}) $/) [3]; This file type is useful: 
    var isexists = false; 
    for (var i in array) { 
      if (filecontenttype.tolowercase () = = Array[i].tolowercase ()) { 
        isexists = true; 
        return true; 
      } 
    if (isexists = = False) { 
      obj.value = null; 
      Alert ("Incorrect upload image type!"); 
      return false; 
    } 
    return false; 
  } 

asp.net foreground code is as follows:

<asp:fileupload id= "FileUpload1" runat= "Server" onchange= "Checkfile" (this); " />

The above is small series for everyone to bring the JS control fileupload upload File type instance code all content, I hope we support cloud Habitat Community ~