如何使用 javaScript 從 function 參數返回值？

Question

I ran into such a problem, in my App, I have a variable that contains productId, Also I have a function which returns productId, I wonder if that is possible to pass productId function into addToCard() function as a parameter and return value,我試圖得到類似的結果addToCard('223343445') ，有可能達到這個結果嗎？ 謝謝

 let singleProductId = '223343445' productId(singleProductId) function productId(parameter){ return parameter } function addToCard(param){ console.log(`${param} added to the card`) }

 <button onclick=addToCard(productId())>add to cart</button>

Answer 1

只需將 function 傳遞到addToCard並在其中調用它。

 let singleProductId = "223343445"; function productId(parameter) { return parameter; } function addToCard(productId) { console.log(`${productId(singleProductId)} added to the card`); } const button = document.querySelector("button"); button.addEventListener("click", e => { addToCard(productId); })

 <button>add to cart</button>

Answer 2

請遵循這種方法

const singleProductId = '223343445';

const productId=(parameter)=>{
    return parameter
}
 const addToCard=(param)=>{
     param=productId(singleProductId) 
  console.log(`${param} added to the card`)
}

<button onclick=addToCard(productId())>add to cart</button>