此方法用于从数组中删除元素。此外，此方法与之不同，pop()因为shift()方法是在数组的开头删除元素。
<html>
<body>
<p id="shift"></p>
<script>
var a = [1,2,3,4,5];
var b = ["apple","mango","banana","guava","strawberry"]
a.shift();
b.shift();
document.write(a);
document.getElementById("shift").innerHTML = b;
</script>
</body>
</html>mango,banana,guava,strawberry 2,3,4,5