使用char变量的减号运算符

let num1 = 10;
let num2 = 5;
let result = num1 - num2;
console.log(result); // 输出 5

let str1 = "10";
let str2 = "5";
let result = str1 - str2;
console.log(result); // 输出 "5"

let num = 10;
let str = num.toString();
console.log(str); // 输出 "10"

let str = "10";
let num = parseInt(str);
console.log(num); // 输出 10

let num1 = 10;
let num2 = 5;
if (num1 - num2 > 0) {
  console.log("num1 is greater than num2");
} else {
  console.log("num1 is less than or equal to num2");
}

let num = 10;
if (num - 0 > 0) {
  console.log("num is positive");
} else {
  console.log("num is negative");
}