js减法运算

let result = a - b;

// 基本减法运算
let a = 10;
let b = 5;
let result = a - b; // result = 5

// 字符串转换为数字进行减法
let c = "15";
let d = "7";
let result2 = Number(c) - Number(d); // result2 = 8

// 时间差计算
let date1 = new Date("2023-10-01T12:00:00Z");
let date2 = new Date("2023-10-01T10:00:00Z");
let timeDifference = date1 - date2; // timeDifference = 7200000 (毫秒)

let str1 = "10";
let str2 = "abc";
let result3 = Number(str1) - Number(str2); // result3 = NaN

// 检查是否为有效数字
if (!isNaN(result3)) {
    console.log("有效结果:", result3);
} else {
    console.log("无效输入");
}

let x = 0.1;
let y = 0.2;
let z = x - y; // z = -0.10000000000000009

// 使用toFixed方法控制小数位数
let fixedResult = (x - y).toFixed(1); // fixedResult = "-0.1"