export default function() {
  // var devicePixelRatio = 1;
  // var scale = 1 / devicePixelRatio;
  // document.querySelector('meta[name="viewport"]').setAttribute('content','initial-scale=' + scale + ', maximum-scale=' + scale + ', minimum-scale=' + scale + ', user-scalable=no');
  // 7.5根据设计稿的横向分辨率/100得来
  // alert(document.documentElement.clientWidth)
  var deviceWidth = document.documentElement.clientWidth;
  // var deviceWidth = window.screen.availWidth
  // alert(navigator.userAgent)
  // alert(deviceWidth)
  // console.log(navigator.userAgent)
  if(deviceWidth > 750) {
    // deviceWidth = 750;
    deviceWidth = 7.5 * 50;
  }

  document.documentElement.style.fontSize = deviceWidth / 7.5 + 'px';

  // 禁止双击放大
  document.documentElement.addEventListener('touchstart', function (event) {
    if (event.touches.length > 1) {
      event.preventDefault();
    }
  }, false);
  var lastTouchEnd = 0;
  document.documentElement.addEventListener('touchend', function (event) {
    var now = Date.now();
    if (now - lastTouchEnd <= 300) {
      event.preventDefault();
    }
    lastTouchEnd = now;
  }, false);
}

npm install px2rem-loader lib-flexible --save 

import 'lib-flexible/flexible.js'

const px2remLoader = {
loader: 'px2rem-loader',
options: {
remUnit: 37.5
}
}

function generateLoaders (loader, loaderOptions) {
const loaders = [cssLoader, px2remLoader]
if (loader) {
loaders.push({
loader: loader + '-loader',
options: Object.assign({}, loaderOptions, {
sourceMap: options.sourceMap
})
})
}