代码示例:(标识:eg_js_array_shift)
<!DOCTYPE html>
<html>
<body>

<h1>JavaScript 数组方法</h1> 

<h2>shift()</h2>

<p>shift() 方法删除数组的第一个元素(并将所有其他元素“移位”到左侧):</p>

<p id="demo1"></p>
<p id="demo2"></p>

<script>
var fruits = ["Banana", "Orange", "Apple", "Mango"];
document.getElementById("demo1").innerHTML = fruits;
fruits.shift();
document.getElementById("demo2").innerHTML = fruits;
</script>

</body>
</html>
运行结果: