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<html>
<head>
<meta charset="utf-8">
<title>Wfuyu教程(wfuyu.com)</title>
</head>
<body>
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<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>
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</body>
</html>