stickUp.js:98 Uncaught ReferenceError: vartop is not defined at HTMLDocument.<anonymous> (stickUp.js:98)

附加var vartop = 0;在var topMargin = 0;
这之后，这里是我附加的代码：
$（document）.ready（function（）{ 
var contentButton = []; 
var contentTop = []; 
var content = []; 
var lastScrollTop = 0; 
var scrollDir = ''; 
var itemClass =''; 
var itemHover =''; 
var menuSize = null; 
var stickyHeight = 0; 
var stickyMarginB = 0; 
var currentMarginT = 0; 
var topMargin = 0; 
var vartop = 0; //附加默认值这里！
$（window）.scroll（function（event）{

加好之后在浏览器控制台就不会报这个错了 Uncaught ReferenceError: vartop is not defined