window.onresize= index.initMainBody; //窗口大小变化时调用
initMainBody: function () {
var scaleWidthPercent = document.documentElement.clientWidth * 1.0 / 1920;
var scaleHeightPercent = document.documentElement.clientHeight * 1.0 / 1080;
$("#main_body").css({
transform: "translateX(-50%) translateY(-50%) scale(" + Math.min(scaleWidthPercent, scaleHeightPercent) + ")" //向左向上移动50%，这里不管比例怎么样，整个页面都会居中
});
}
