h5/js/app.js

const globalHeaders = {
    appVersion: '1.0.1'
}


const mathSub = (arg1, arg2) => {
  let r1 = 0
  let r2 = 0
  let m = 0
  let n = 0
  
  try {
    r1 = arg1.toString().split('.')[1].length
  } catch (e) {}
  
  try {
    r2 = arg2.toString().split('.')[1].length
  } catch (e) {}
  
  m = Math.pow(10, Math.max(r1, r2))
  n = r1 >= r2 ? r1 : r2
  
  return ((Number(arg1) * m - Number(arg2) * m) / m).toFixed(n)
}