guosen-ldt-mall/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) => {
		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
	}

export default digital