前端PC屏幕适配

// 屏幕适配
var resize = function () {
  var zoom;
  var app = document.querySelector("body");
  var wid = window.innerWidth;
  var realWid = wid > 1200 ? wid : 1200;
  zoom = realWid / 2100;
  app.style.zoom = zoom;
};
resize();
window.onresize = resize;