数组的末尾添加新的元素 - push() - 在线编辑器

          <p id="demo">单击按钮给数组添加新的元素。</p>
<button onclick="myFunction()">点我</button>
<script>
  var fruits = ["Banana", "Orange", "Apple", "Mango"];

  function myFunction() {
    fruits.push("Kiwi")
    var x = document.getElementById("demo");
    x.innerHTML = fruits;
  }
</script>
        