功能在javascript

Question

我在網上學習JavaScript造成的錯誤，我停留在一個點，我需要調用一個函數

var creditCheck = function (income) 
{ 
    if (income>=100) 
    { 
     return console.log("You earn a lot of money! You qulaify for a credit card."); 
    } 
    else { 
     return console.log("Alas yo do not qualify for credit card. Capitalism is creul like that."); 
    } 
}; 

creditCheck(75); 

以上是我的代碼在我打電話的creditCheck功能。現在當我把75的功能參數else命令（即"Alas yo do not qualify for credit card. Capitalism is creul like that."）在控制檯中執行兩次。

爲什麼此文本在控制檯中出現兩次？

感謝

Answer 1

編輯：CodeAcademy自動將調用與75參數的功能，所以沒有必要爲你調用該函數。對於你的代碼，你想返回一個字符串，所以不是返回console.log，返回字符串中的console.log裏面，像

return "You earn a lot of money! You qulaify for a credit card."; //or whatever the string is 

此代碼將通過測試：

var creditCheck = function (income) 
{ 
    if (income>=100) 
    { 
     return "You earn a lot of money! You qualify for a credit card." 
    } 
    else { 
     return 'Alas you do not qualify for a credit card. Capitalism is cruel like that.' ; 
    } 
}; 

當我在我的控制檯中運行它，我只得到一個聲明。我猜你在別處叫它。發佈您的整個代碼，否則將很難幫助您。但是，當您說return console.log()時，您每次都會返回undefined，因此它沒有任何用處。你可能想要做的是

var creditCheck = function (income) 
{ 
    if (income>=100) 
    { 
     console.log("You earn a lot of money! You qulaify for a credit card."); 
     return true; //or return "You earn a lot of money!" 
    } 
    else { 
     console.log("Alas yo do not qualify for credit card. Capitalism is creul like that."); 
     return false;//or return "You don't qualify"; 
    } 
}; 

creditCheck(75);