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                <p>AI 機器人店員:<span id='hello'></span></p>
<p>客人:我需要<input type="text" id="pizzaNum" class="tag">個 Pizza 還有<input type="text" id="beerNum" class="tag">杯啤酒。<input type="button" id="click" value="點餐完成">
<p>AI 機器人店員:<span id="ok"></span><span id="total"></span></p>


  width: 30px;


function welcome(){
    var hello = '歡迎光臨!請問想要點什麼呢?';
    document.getElementById('hello').textContent = hello;

document.getElementById('click').onclick = function order(){
  var count = '好的!沒有問題,我幫您算一下,這樣總共是';
  var pizzaPrice = 300;
  var beerPrice = 45;
  var pizzaNum = parseInt(document.getElementById('pizzaNum').value);
  var beerNum = parseInt(document.getElementById('beerNum').value);
  document.getElementById('ok').textContent = count;
  document.getElementById('total').textContent = (pizzaPrice * pizzaNum) + (beerPrice * beerNum)+'元'