功能在javascript

Question

我在网上学习JavaScript造成的错误，我停留在一个点，我需要调用一个函数

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); 

以上是我的代码在我打电话的creditCheck功能。现在当我把75的功能参数else命令（即"Alas yo do not qualify for credit card. Capitalism is creul like that."）在控制台中执行两次。

为什么此文本在控制台中出现两次？

感谢

Answer 1

编辑：CodeAcademy自动将调用与75参数的功能，所以没有必要为你调用该函数。对于你的代码，你想返回一个字符串，所以不是返回console.log，返回字符串中的console.log里面，像

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

此代码将通过测试：

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.' ; 
    } 
}; 

当我在我的控制台中运行它，我只得到一个声明。我猜你在别处叫它。发布您的整个代码，否则将很难帮助您。但是，当您说return console.log()时，您每次都会返回undefined，因此它没有任何用处。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);