JS根據屏幕分辨率改變背景寬高

  //控制瀏覽器顯示的高寬
        function document_loaded() {
            GotoMainStep(0);
            var WH = document.body.scrollHeight*3/4;
            document.getElementById("main1").style.height = WH + "px";
            var WW = document.body.scrollWidth * 3 / 4;
            document.getElementById("main2").style.height = WW + "px";
            //js預加載
            //setTimeout(function () {
            //    if(window.parent && window.parent.YZLoader && window.parent.YZLoader.cache)
            //        window.parent.YZLoader.cache();
            //}, 50);
        }