Question

我正在网上学习javascript，我被困在需要调用函数的地方

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);

以上是我调用creditCheck函数的代码。现在当我在函数参数else命令中放入75时（即"Alas yo do not qualify for credit card. Capitalism is creul like that."）在控制台中执行两次。

为什么这个文本在控制台中出现两次？

由于

Answer 1

编辑：CodeAcademy会自动调用参数为75的函数，因此您无需调用该函数。对于你的代码，你想要返回一个字符串，所以不是返回console.log，而是在console.log中返回字符串，比如

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时，我只收到一条声明。我猜你在别的地方叫它。发布您的整个代码，否则很难帮助您。但是，当您说return console.log()时，您每次都会返回undefined，所以它没有任何用处。您可能想要做的是

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);

导致javascript错误的函数

1 个答案: