限制上传文件类型程序代码

(只能上传JPG或GIF格式的图片)

+1,length)))1;")){alert("Allowed file types:n"+af);obj.createTextRange().execCommand('delete')};
}}

/*
* 判断图片类型
*
* @param ths
* type="file"的javascript对象
* @return true-符合要求,false-不符合
*/
function checkImgType(ths){
if (ths.value == "") {
alert("请上传图片");
return false;
} else {
if (!/.(gif|jpg|jpeg|png|GIF|JPG|PNG)$/.test(ths.value)) {
alert("图片类型必须是.gif,jpeg,jpg,png中的一种");
ths.value = "";
return false;
}
}
return true;
}

$name=$_FILES['file4']['name']; //获取客户端机器原文件的名称
$type=strstr($name,"."); //获取从"."到最后的字符 if($type!=".txt")
{ echo "对不起,您上传文件的格式不正确!!";
echo "将在3秒钟后返回前页...";
}

$temppath=$upfile['tmp_name'];
$fileinfo=pathinfo($upfile['name']);
$extension=$upfile['type'];
switch( $extension )
{
case 'application/msword':
$extension ='doc';
break;
case 'application/vnd.ms-excel':
$extension ='xls';
break;
case 'application/vnd.openxmlformats-officedocument.wordprocessingml.document':
$extension ='docx';
break;
case 'application/vnd.ms-powerpoint':
$extension ='ppt';
break;
case 'application/pdf':
$extension ='pdf';
break;
case 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet':
$extension ='xlsx';
break;
default:
die('只允许上传doc,docx,xls,pdf,ppt文件 ');

}