//定义窗口高、宽的全局变量 
 var winHeight = 0;
 var winWidth = 0;
 var getWinSize = function(){}; //定义获取窗口高宽的空函数
 getWinSize.winWidth = function() //获取窗口宽度
 {
  if (window.innerWidth)//for ie
...