JavaScript数组shift()方法移除首个元素详解

<!DOCTYPE html>
<html>
<body>
<p id="demo">
Click the button to remove the first
element of the array.</p>
<button onclick="myFunction()">Try it</button>
<script>
var fruits = ["Banana","Orange","Apple","Mango"];
function myFunction()
{
fruits.shift();
var x=document.getElementById("demo");
x.innerHTML=fruits;
}
</script>
</body>
</html>