js点赞浮动特效

(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: "<b style='font-family:Microsoft YaHei;'>+1</b>"
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("<span class='num'>" + options.str + "</span>");
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);

$.tipsBox({
obj: $("#zans"),
str: "+1",
callback: function() {}
});