js 获取窗口大小

 //获得窗口大小

        function findDimensions() //函数：获取尺寸

        {

            var point = {};

            //获取窗口宽度

            window.innerWidth && (point.width = window.innerWidth);

            window.innerHeight && (point.height = window.innerHeight);

            /*       

                        //document.body.clientWidth   网页可见区域宽

            //document.body.clientHeight   网页可见区域高：

                        //document.body.clientWidth;

            //document.documentElement.clientHeight

                  document.body.clientWidth && (point.width = document.body.clientWidth);

                        document.body.clientHeight && (point.height =document.body.clientHeight); */

            //winHeight = document.body.clientHeight;

            return point;

        }