tryjsref_unshift 在线代码实例

 <p id="demo">单击按钮在数组中插入元素。</p>
<button onclick="myFunction()">点我</button>
<script>
function myFunction(){
	var fruits = ["Banana", "Orange", "Apple", "Mango"];
	fruits.unshift("Lemon","Pineapple");
	var x=document.getElementById("demo");
	x.innerHTML=fruits;
}
</script>
<p><b>注意:</b> unshift()方法不能用于 Internet Explorer 8 之前的版本，插入的值将被返回成<em>undefined</em>。</p>