随笔记录42 前端数字相加、减精度丢失问题

/**

• 数字相加（亲测有效）
• @param {*} arg1
• @param {*} arg2
• @returns
  */
  function accAdd(arg1, arg2) {
  return changeNum(arg1, arg2)
  }

/**

• 数字相减
• @param {*} arg1
• @param {*} arg2
• @returns
  */
  function accSub(arg1, arg2) {
  return changeNum(arg1, arg2, false)
  }

/**

• 数字相乘
• @param {*} arg1
• @param {*} arg2
• @returns
  */
  function accMul(arg1, arg2) {
  let m = 0;
  m = accAdd(m, getDecimalLength(arg1))
  m = accAdd(m, getDecimalLength(arg2))
  return getNum(arg1) * getNum(arg2) / Math.pow(10, m)
  }

/**

• 数字相除
• @param {*} arg1
• @param {*} arg2
• @returns
  */
  function accDiv(arg1, arg2) {
  let t1, t2;
  t1 = getDecimalLength(arg1)
  t2 = getDecimalLength(arg2)
  if(t1 - t2 > 0) {
  return (getNum(arg1) / getNum(arg2)) / Math.pow(10, t1 - t2)
  } else {
  return (getNum(arg1) / getNum(arg2)) * Math.pow(10, t2 - t1)
  }
  }

function changeNum(arg1 = '', arg2 = '', isAdd = true){
function changeInteger(arg, r, maxR){
if(r != maxR){
let addZero = ''
for(let i = 0; i < maxR - r; i++){
addZero += '0'
}
arg = Number(arg.toString().replace('.', '') + addZero)
}else{
arg = getNum(arg)
}
return arg
}
let r1, r2, maxR, m;
r1 = getDecimalLength(arg1)
r2 = getDecimalLength(arg2)
maxR = Math.max(r1, r2)
arg1 = changeInteger(arg1, r1, maxR)
arg2 = changeInteger(arg2, r2, maxR)
m = Math.pow(10, maxR)
if(isAdd){
return (arg1 + arg2) / m
}else{
return (arg1 - arg2) / m
}
}

function getDecimalLength(arg = ''){
try {
return arg.toString().split(".")[1].length
} catch (e) {
return 0
}
}

function getNum(arg = ''){
return Number(arg.toString().replace(".", ""))
}
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版权声明：本文为CSDN博主「风津丶」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/weixin_40457514/article/details/125887581