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//獲取具有id的按鈕
  const button = document.getElementById("dayButton");
  //星期幾的數(shù)組
  const weekdays = ["星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"];
  //當前星期幾的索引
  const currentDayiIndex = new Date().getDay();
  //點擊按鈕顯示星期幾
    dayButton.addEventListener("click",()=>{
        day.innerHTML = weekdays[currentDayiIndex]
        button.innerHTML = "征服" + weekdays[currentDayiIndex];
        })

<button class="button" id="dayButton">顯示星期幾</button>
<p id="day"></p>

希望能幫到你

document.querySelector('.button').textContent = '征服 ' + new Date().toLocaleDateString('en-us', {weekday:'long'});

<button class="button"></button>