ajax代码范例

 $.ajax({
	url: url,
	type: "post",
	dataType: "json",
	data: data,
	beforeSend: function(xhr) {
		img.show().css({
			"position": "fixed",
			"top": "40%",
			"left": "45%",
			"margin-top": function() {
				return - 1 * img.height() / 2;
			},
			"margin-left": function() {
				return - 1 * img.width() / 2;
			}
		});
		mask.show().css("opacity", "0.1");
	},
	success: function(result) {
		doSuccess()
	},
	complete: function(xhr) {
		img.hide();
		mask.hide();
	}
});

原文链接:http://www.fastmvc.com/blog/1262.html