activitys-uniapp/utils/digital.js

let digital = {}

//浮点数相加
digital.floatAdd = (arg1, arg2) => {
	var r1, r2, m;
	try {
		r1 = arg1.toString().split(".")[1].length
	} catch (e) {
		r1 = 0
	}
	try {
		r2 = arg2.toString().split(".")[1].length
	} catch (e) {
		r2 = 0
	}
	m = Math.pow(10, Math.max(r1, r2));
	return (arg1 * m + arg2 * m) / m;
},

//浮点数相减
digital.floatSub = (arg1, arg2) => {
	var r1, r2, m, n;
	try {
		r1 = arg1.toString().split(".")[1].length
	} catch (e) {
		r1 = 0
	}
	try {
		r2 = arg2.toString().split(".")[1].length
	} catch (e) {
		r2 = 0
	}
	m = Math.pow(10, Math.max(r1, r2));
	n = (r1 >= r2) ? r1 : r2;
	return ((arg1 * m - arg2 * m) / m).toFixed(n)
},

//浮点数相乘
digital.floatMul=(arg1, arg2)=> {
	if (arg1== undefined || arg2==undefined) {
		return 0
	}
	var m = 0;
	var s1 = arg1.toString();
	var s2 = arg2.toString();
	try {
		m += s1.split(".")[1].length;
	} catch (e) {}
	try {
		m += s2.split(".")[1].length;
	} catch (e) {}

	return Number(s1.replace(".", "")) * Number(s2.replace(".", "")) / Math.pow(10, m);
},

//四舍五入保留2位小数（不够位数，则用0替补）
digital.keepTwoDecimalFull = num => {
  var result = parseFloat(num)
  if (isNaN(result)) {
    return false
  }
  result = Math.round(num * 100) / 100
  var s_x = result.toString()
  var pos_decimal = s_x.indexOf('.')
  if (pos_decimal < 0) {
    pos_decimal = s_x.length
    s_x += '.'
  }
  while (s_x.length <= pos_decimal + 2) {
    s_x += '0'
  }
  return s_x
}

//保留两位小数，不四舍五入
digital.keepTwoDecimal=(num)=>{
	return Math.floor(num * 100) / 100
}

export default digital