js 乘除法小数问题
因为经常需要js来处理显示,就做下笔记
除法:
function accDiv(arg1, arg2) { var t1 = 0, t2 = 0, r1, r2; try { t1 = arg1.toString().split(".")[1].length } catch (e) {} try { t2 = arg2.toString().split(".")[1].length } catch (e) {} with(Math) { r1 = Number(arg1.toString().replace(".", "")) r2 = Number(arg2.toString().replace(".", "")) return (r1 / r2) * pow(10, t2 - t1); } }
乘法:
function accMul(arg1, arg2) { var m = 0, s1 = arg1.toString(), s2 = arg2.toString(), number, z = ''; try { m += s1.split(".")[1].length } catch (e) { console.log(e); } try { m += s2.split(".")[1].length } catch (e) { console.log(e); } console.log(`m = ${m}`) number = Number(s1.replace(".", "")) * Number(s2.replace(".", "")) / Math.pow(10, m); if (m) { try { var n = m - number.toString().split(".")[1].length; if (n) { for (var i = 0; i < n; i++) { z += '0'; } } var r = number.toString() + z; return r } catch (e) { for (var i = 0; i < m; i++) { z += '0'; } var r = number.toString() + '.' + z; return r } } return Number(s1.replace(".", "")) * Number(s2.replace(".", "")) / Math.pow(10, m) }
加法:
function accAdd(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 }