screen对象

screen对象包含有关客户端显示屏幕的信息
screen.availWidth
screen.availHeight

        // 获取客户端关于屏幕的信息
        var screenWidth =  window.screen.availWidth;
         //获取可视区域的width
        var viewWidth = document.body.clientWidth;
        console.log(screenWidth)
        console.log(viewWidth)