如何检查ajax .load调用是否已加载

Consider the following code:

考虑下面的代码:

var loadingHTML = $("<div style='width:100%;'> <h1>Loading...</h1></div>");
loadingHTML.hide();
$(".row").append(loadingHTML);
loadingHTML.fadeIn('slow');
$(".row").append($("<div>").load("get-more-images.php?start=36&end=36"));
//  loadingHTML.hide();
var l