Question

// var
var differentBillsInUSD;

// start of bills
differentBillsInUSD = {
    firstBill: parseInt(124),
    secondBill: parseInt(48),
    thirdBill: parseInt(268),
    fourthBill: parseInt(180),
    fifthBill: parseInt(42),
}

// console to check if everything is alright
console.log(differentBillsInUSD);
console.log("Checking if bill is alright ^");

function calcBill(numberBill) {
    if (numberBill < 50) {
        return(numberBill + " tip is: " (numberBill*0.20));
    } else if (numberBill >= 50 && numberBill <= 200) {
        return(numberBill + " tip + total is: " (numberBill*0.15));
    } else if (numberBill > 200) {
        return(numberBill + " tip + total is: " (numberBill*0.20));
    }
}
function calcBillTotal(numberBill) {
    if (numberBill < 50) {
        return(numberBill + " tip + total is: " ((numberBill*0.20)+numberBill));
    } else if (numberBill >= 50 && numberBill <= 200) {
        return(numberBill + " tip + total is: " ((numberBill*0.15)+numberBill));
    } else if (numberBill > 200) {
        return(numberBill + " tip + total is: " ((numberBill*0.20)+numberBill));
    }
}

// first bill
console.log(calcBill(differentBillsInUSD.firstBill));
console.log(calcBillTotal(differentBillsInUSD.firstBill));

// second bill
cosnole.log(calcBill(differentBillsInUSD.secondBill));
cosnole.log(calcBillTotal(differentBillsInUSD.secondBill));
ERROR CODE
script.js:21 Uncaught TypeError: " tip + total is: " is not a function
    at calcBill (script.js:21)
    at script.js:37

它不起作用，因为我正在应对编码挑战。看来我是javascript新手。我试图做我的研究，很难找到。我在代码中间，但是无法修复。

Answer 1

return（numberBill +“提示是：” + （numberBill * 0.20））;

您只是想在其中加一个加号...

Answer 2

return（numberBill +“提示+总计为：”（numberBill * 0.15））;

在JS中，如果您将（）放在任何后面，它将尝试将其作为函数执行。因为您错过了“（numberBill * 0.15）”前面的“ +”，所以它试图执行“ tip + total is：”作为函数。您只需要添加一个“ +”

Answer 3

将字符串与变量连接时，需要在JavaScript中使用“ +”号。在这里，如果您在每个if，else if和else语句中都注意到您缺少“ +”号。

if（numberBill <50）{ return（numberBill +“提示是：” + （numberBill * 0.20））;

我有一个函数，然后是一个if else语句，然后在其中返回数学值

3 个答案: