jQuery点赞效果

<script type="text/javascript">
(function ($) {
	$.extend({
		tipsBox: function (options) {
			options = $.extend({
				obj: null,  //jq对象，要在那个html标签上显示
				str: "+1",  //字符串，要显示的内容;也可以传一段html，如: "+1"
				startSize: "12px",  //动画开始的文字大小
				endSize: "30px",    //动画结束的文字大小
				interval: 600,  //动画时间间隔
				color: "red",    //文字颜色
				callback: function () { }    //回调函数
			}, options);
			$("body").append("" + options.str + "");
			var box = $(".num");
			var left = options.obj.offset().left + options.obj.width() / 2;
			var top = options.obj.offset().top - options.obj.height();
			box.css({
				"position": "absolute",
				"left": left + "px",
				"top": top + "px",
				"z-index": 9999,
				"font-size": options.startSize,
				"line-height": options.endSize,
				"color": options.color
			});
			box.animate({
				"font-size": options.endSize,
				"opacity": "0",
				"top": top - parseInt(options.endSize) + "px"
			}, options.interval, function () {
				box.remove();
				options.callback();
			});
		}
	});
})(jQuery);
  
function niceIn($elem){
	$elem.find('i').addClass('niceIn');
	setTimeout(function(){
		$elem.find('i').removeClass('niceIn');	
	},1000);		
}
$(function () {
	$("#btn").click(function () {
		$.tipsBox({
			obj: $(this),
			str: "+1",
			callback: function () {
			}
		});
		niceIn($(this));
	});
});
</script>