Auto image alt with image title


$("img").each(function() {
var img_src = jQuery(this).attr('src');
if (typeof img_src !== typeof undefined && img_src !== false) {
var img_alt = jQuery(this).attr('alt');
var str = img_src
var pieces = str.split('/');
var imgName = pieces[pieces.length-1];
var imgnameArray = imgName.split('.');
var alt = imgnameArray[0];
if(img_alt == '' || typeof img_alt === typeof undefined || img_alt === false) {
jQuery(this).attr('alt',alt);
}
}
});