在 javascript 的另一个函数中将 func 作为 arg 传递

Question

这是我的代码：

//Player Loadout
//Version 1.0 by Madi Magdy

function Player(name,sex,side) {
    this.name = name;
    this.sex = sex;
    this.side = side;
}

//var newPlayer = new Player(prompt("Please enter your name"),prompt("Please enter your sex"),prompt("Please enter your nationality"));

//console.log("Hello " + newPlayer.name + "!");

function Class(classType,mainWeapon,sideWeapon) {
    this.classType = classType;
    this.mainWeapon = mainWeapon;
    this.sideWeapon = sideWeapon;
}
assaultClass = new Class("Assault","M416","M9");
engineerClass = new Class("Engineer","AK5C","P226");
reconClass = new Class("Recon","SRR61","Deagle44");
supportClass = new Class("Support","M249","M1911");

classChooser = function(playerChoice) {
    if (playerChoice === assaultClass.classType) {
        console.log("You chose the " + assaultClass.classType + " " + "class! Your default weapons are " + assaultClass.mainWeapon + " " + "and " + assaultClass.sideWeapon);
    }
    else if (playerChoice === engineerClass.classType) {
        console.log("You chose the " + engineerClass.classType + " " + "class! Your default weapons are " + engineerClass.mainWeapon + " " + "and " + engineerClass.sideWeapon);
    }
    else if (playerChoice === reconClass.classType) {
        console.log("You chose the " + reconClass.classType + " " + "class! Your default weapons are " + reconClass.mainWeapon + " " + "and " + reconClass.sideWeapon);
    }
    else if (playerChoice === supportClass.classType) {
        console.log("You chose the " + supportClass.classType + " " + "class! Your default weapons are " + supportClass.mainWeapon + " " + "and " + supportClass.sideWeapon);
    }


};

classChooser(prompt("Please choose your class! Type in Assault or Engineer or Recon or Support!"));


classWeapons = function(weapon,attach,camo) {
    this.weapon = weapon;
    this.attach = attach;
    this.camo = camo;
};

yourClassWeapons = new classWeapons(prompt("Choose your weapon"),prompt("Choose your weapon attachment"),prompt("Choose your camouflage color"));

var classChosen = function(yourChosenClass) {
    if (yourChosenClass === assaultClass.classType) {
        console.log("Your weapons are listed as follows");
        console.log(yourClassWeapons);
    }
    else {
        console.log("NOPE");
    }
};

classChosen(classChooser()); //I also tried classChosen(classChooser);

我在提示时输入字符串“Assault”，当我尝试将 classChooser 函数作为参数传递给我的 classChosen 函数时，if 之后的语句永远不会执行，但 else 会执行。我有什么错误？

Answer 1

主要问题是你没有传递给classChosen 你认为你传递的东西。实际上，变量yourChosenClass 是undefined，这就是它不等于assaultClass.classType 的原因。

您需要存储玩家选择的值，或者从classChooser 返回。此外，如果classChooser 的提示是函数的一部分而不是作为参数传递，那么对您的代码会更好。所以它可能是这样的：

classChooser = function() {
    var playerChoice = prompt("Please choose your class! Type in Assault or Engineer or Recon or Support!");
    if (playerChoice === assaultClass.classType) {
        console.log("You chose the " + assaultClass.classType + " " + "class! Your default weapons are " + assaultClass.mainWeapon + " " + "and " + assaultClass.sideWeapon);
    }
    else if (playerChoice === engineerClass.classType) {
        console.log("You chose the " + engineerClass.classType + " " + "class! Your default weapons are " + engineerClass.mainWeapon + " " + "and " + engineerClass.sideWeapon);
    }
    else if (playerChoice === reconClass.classType) {
        console.log("You chose the " + reconClass.classType + " " + "class! Your default weapons are " + reconClass.mainWeapon + " " + "and " + reconClass.sideWeapon);
    }
    else if (playerChoice === supportClass.classType) {
        console.log("You chose the " + supportClass.classType + " " + "class! Your default weapons are " + supportClass.mainWeapon + " " + "and " + supportClass.sideWeapon);
    }
    return playerChoice;
};

classChosen(classChooser());
// or...
// var playerChosenClass = classChooser();
// classChosen(playerChosenClass);

另外，选择武器可以用类似的方式重构：

weaponChooser = function() {
    var weapon = prompt("Choose your weapon");
    var attachment = prompt("Choose your weapon attachment");
    var camo = prompt("Choose your camouflage color");
    return new classWeapons(weapon, attachment, camo);
}

yourClassWeapons = weaponChooser();

Answer 2

你的 classChooser 函数返回未定义，所以在 类选择（类选择器（））； 您将参数参数作为未定义传递。那就是执行 else 语句。

要完成这项工作，您需要

classChooser = function(playerChoice) {
     var returnType;
     if (playerChoice === assaultClass.classType) {
         console.log("You chose the " + assaultClass.classType + " " + "class! Your default weapons are " + assaultClass.mainWeapon + " " + "and " + assaultClass.sideWeapon);
         return assaultClass.classType;
    }
    else if (playerChoice === engineerClass.classType) {
        console.log("You chose the " + engineerClass.classType + " " + "class! Your default weapons are " + engineerClass.mainWeapon + " " + "and " + engineerClass.sideWeapon);
        returnType = engineerClass.classType;
    }
    else if (playerChoice === reconClass.classType) {
        console.log("You chose the " + reconClass.classType + " " + "class! Your default weapons are " + reconClass.mainWeapon + " " + "and " + reconClass.sideWeapon);

        returnType = reconClass.classType;
    }
    else if (playerChoice === supportClass.classType) {
        console.log("You chose the " + supportClass.classType + " " + "class!     Your default weapons are " + supportClass.mainWeapon + " " + "and " + supportClass.sideWeapon);
        returnType = supportClass.classType;

    }
    return returnType;
};
classChoosen(classChooser(prompt("Please choose your class! Type in Assault or Engineer or Recon or Support!")));