是否有我缺少的物件方法可以針對字串測驗新物件值？-有解無憂

我正在嘗試使用帶有 if 陳述句的方法來測驗物件是否具有特定鍵的值。

function PCParts(motherboard, graphics, cpu, randomAccessMemory) {
  this.motherboard = motherboard;
  this.graphics = graphics;
  this.cpu = cpu;
  this.randomAccessMemory = randomAccessMemory;
  //these methods are called and a result is displayed
  this.caseSize = case_size();
  this.storage = storage_device();
}

//this should check the input and return a proper case size.
//For some reason, in the for-in loop it decides to return "mid-tower" regardless of if the first part of the if statement is true.
function case_size() {
  if (this.motherboard == "MSI B450 Tomahawk") {
    this.caseSize = "full tower";
  } else {
    this.caseSize = "mid tower";

  }
  return this.caseSize;
}

//this is having the same issue as case_size function
//it refuses to display "NVMe-1TB" even if the if statment is true.
//I tried removing "this" to see if that was the issue and it refused to display anything.
function storage_device() {
  if (this.cpu == "AMD Ryzen 5" && this.randomAccessMemory == "Corsair Vengeance 32GB") {
    this.storage = "NVMe 1TB";
  } else {
    this.storage = "HDD 1TB";
  }
  return this.storage;
}



let gaming_computer = new PCParts("MSI B450 Tomahawk", "GTX 3090", "AMD Ryzen 5", "Corsair Vengeance 32GB");

for (let property in gaming_computer) {
  document.write(`${property}: ${gaming_computer[property]} <br>`);
}

代碼用我遇到的問題進行了注釋，但基本上“if”陳述句由于某種原因是錯誤的，而“else”陳述句就是正在顯示的內容。

是否有一些物件方法可以針對字串測驗新物件值？如果這已在其他地方得到回答，對不起......我一直在尋找但找不到答案。謝謝。

uj5u.com熱心網友回復：

在您的 case_size 中，您使用了這個關鍵字。但 case_size 只是一個函式而不是一個類。所以這個關鍵字不應該被使用。而在 PCParts() 中，當您呼叫 case_size() 時，您必須傳遞主板的引數，以便在自己的函式中它可以訪問主板的值，否則它不能從另一個函式中獲取主板的值。就這樣。快樂編碼！

function PCParts(motherboard, graphics, cpu, randomAccessMemory) {
    this.motherboard = motherboard;
    this.graphics = graphics;
    this.cpu = cpu;
    this.randomAccessMemory = randomAccessMemory;
    this.caseSize = case_size(motherboard);
    this.storage = storage_device();
  }
  function case_size(motherboard) {
    if (motherboard == "MSI B450 Tomahawk") {
      caseSize = "full tower";
    } else {
      caseSize = "mid tower";
    }
    return caseSize;
  }
  function storage_device() {
    if (this.cpu == "AMD Ryzen 5" && this.randomAccessMemory == "Corsair Vengeance 32GB") {
      this.storage = "NVMe 1TB";
    } else {
      this.storage = "HDD 1TB";
    }
    return this.storage;
  }
  let gaming_computer = new PCParts("MSI B450 Tomahawk", "GTX 3090", "AMD Ryzen 5", "Corsair Vengeance 32GB");
  for (let property in gaming_computer) {
    document.write(`${property}: ${gaming_computer[property]} <br>`);
  }

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標籤：javascript目的if 语句核心价值

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