javascript - Console.log返回错误答案

我是JS的新手，这是我的第一门逻辑编程语言。出于某种原因，无论我的收入和贷款金额是多少，否则都会返回else console.log。我无法显示“已批准”消息吗？

function LoanApp(personName, income, loanAmount){
    this.personName = personName;
    this.income = income;
    this.loanAmount = loanAmount;

    var bankBranch = "New York";
    var approvalStatus = "invalid";

    this.submit = function (income, loanAmount){
        if (income / loanAmount >= 2) {
            approvalStatus = "Approved";
            console.log("Congrats you're approved for " + this.loanAmount + ".")
        } else {
            approvalStatus = "On Review";
            console.log("Your application needs further review.")
        };
    };
};

var tony = new LoanApp("Tony"5000,1000);
tony.submit();  //returns else console.log but should be "Congrats"

最佳答案

您的submit函数定义为function (income, loanAmount)。由于您不向函数传递任何内容，因此两者均设置为undefined，并且undefined / undefined >= 2的值为false。

解决此问题所需要做的就是：


从函数声明中删除参数。
在函数中将所有出现的income替换为this.income（与loanAmount相同），因此它知道在哪个范围中查找它们。