删除数组的第一个元素 - shift()

<p id="demo">单击按钮删除数组的第一个元素。</p>

<p id="demo2"></p>

<button onclick="myFunction()">点我</button>

<script>

  var fruits = ["Banana", "Orange", "Apple", "Mango"];

​

  function myFunction() {

    var delell = fruits.shift();

    var x = document.getElementById("demo");

    x.innerHTML = '删除后数组为：' + fruits;

    document.getElementById("demo2").innerHTML = '删除的元素是：' + delell;

  }

</script>