在餐厅计费系统中使用“call”、“apply”和“bind”

// Function to calculate the total billfunction calculateTotalBill(taxRate, discount) {    const taxAmount = this.orderTotal * (taxRate / 100); // Calculate tax based on the total order amount    const totalBill = this.orderTotal + taxAmount - discount; // Calculate the final bill    return totalBill;}// Customer objectsconst customer1 = {    name: "Sarah",    orderTotal: 120 // Total order amount for Sarah};const customer2 = {    name: "Mike",    orderTotal: 200 // Total order amount for Mike};// 1. Using `call` to calculate the total bill for Sarahconst totalBillSarah = calculateTotalBill.call(customer1, 10, 15); // 10% tax and $15 discountconsole.log(`${customer1.name}'s Total Bill: $${totalBillSarah}`); // Output: Sarah's Total Bill: $117// 2. Using `apply` to calculate the total bill for Mikeconst taxRateMike = 8; // 8% taxconst discountMike = 20; // $20 discountconst totalBillMike = calculateTotalBill.apply(customer2, [taxRateMike, discountMike]); // Using apply with an arrayconsole.log(`${customer2.name}'s Total Bill: $${totalBillMike}`); // Output: Mike's Total Bill: $176// 3. Using `bind` to create a function for Sarah's future calculationsconst calculateSarahBill = calculateTotalBill.bind(customer1); // Binding Sarah's contextconst totalBillSarahAfterDiscount = calculateSarahBill(5, 10); // New tax rate and discountconsole.log(`${customer1.name}'s Total Bill after New Discount: $${totalBillSarahAfterDiscount}`); // Output: Sarah's Total Bill after New Discount: $115