JavaScript 数组 shift()

javascriptweb developmentfront end technologyobject oriented programming更新于 2024/8/14 18:20:17

JavaScript 的 shift() 方法用于删除数组的第一项。

语法如下 −

array.shift()

现在让我们在 JavaScript 中实现 shift() 方法 −

示例

<!DOCTYPE html>
<html>
<body>
   <h2>Demo Heading</h2>
   <p id="test"></p>
   <script>
      var arrStud = ["Laptop", "Desktop", "Tablet"];
      document.getElementById("test").innerHTML = "Initial array = "+arrStud+", <br>Removed first             element = "+arrStud.shift();
   </script>
</body></html>

输出

示例

<!DOCTYPE html>
<html>
<body>
   <h2>Car Variant</h2>
   <button onclick="display()">Result</button>
   <p id="test"></p>
   <script>
      var car = ["Hatchback", "Convertible", "SUV", "AUV", "MUV"];
      document.getElementById("test").innerHTML = "Initial Array = "+car;
      function display() {
         car.shift();
         document.getElementById("test").innerHTML = "Array after removing the 1st element = "+car;
      }
   </script>
</body></html>