用javascript添加浮点数

let floatNumber = 1.23e-4;

let sum = 0.1 + 0.2;
console.log(sum); // 输出 0.30000000000000004

let difference = 0.3 - 0.2;
console.log(difference); // 输出 0.09999999999999998

let product = 0.1 * 0.2;
console.log(product); // 输出 0.020000000000000004

let quotient = 0.3 / 0.2;
console.log(quotient); // 输出 1.4999999999999998

let floatNumber = 0.1 + 0.2;
console.log(floatNumber.toFixed(2)); // 输出 "0.30"