去掉else
if(document.product_add.image1.value!="")
{
alert("image1");
get_the_file_name(document.product_add.image1.value);
}
if(document.product_add.image2.value!="")
{
alert("image2");
get_the_file_name(document.product_add.image2.value);
}
if(document.product_add.image1.value!="")
{
alert("image1");
get_the_file_name(document.product_add.image1.value);
}
if(document.product_add.image2.value!="")
{
alert("image2");
get_the_file_name(document.product_add.image2.value);
}
if(document.product_add.image1.value=="")
{
alert("image1");
get_the_file_name(document.product_add.image1.value);
}
else if(document.product_add.image2.value=="")
{
alert("image2");
get_the_file_name(document.product_add.image2.value);
}
else
...
if(document.product_add.image1.value!="" && msg="")
{
msg="image1");
get_the_file_name(document.product_add.image1.value);
}
if(document.product_add.image2.value!="" && msg="")
{
msg("image2");
get_the_file_name(document.product_add.image2.value);
}
alert (msg)