js-根据屏幕大小等比例放大缩小

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

});

}