Js 精度问题_Js 数字计算精度问题

一、Js 精度问题_Js 数字计算精度问题

        var num1 = 0.01;
        var num2 = 0.2;
        var num3 = num1 + num2;
        console.info(num3);//0.21000000000000002  计算结果

// 加法 =====================
0.1 + 0.2 = 0.30000000000000004
0.7 + 0.1 = 0.7999999999999999
0.2 + 0.4 = 0.6000000000000001

// 减法 =====================
1.5 - 1.2 = 0.30000000000000004
0.3 - 0.2 = 0.09999999999999998
 
// 乘法 =====================
19.9 * 100 = 1989.9999999999998
0.8 * 3 = 2.4000000000000004
35.41 * 100 = 3540.9999999999995

// 除法 ======&