数组的末尾添加新的元素 - push()

<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>