<html><body><p>单击按钮将元素添加到数组的开头。</p><button onclick="myFunction()">试一试</button><p id="demo"></p><script>var fruits = ["香蕉","橙子","苹果","芒果"];document.getElementById("demo").innerHTML = fruits;function myFunction() { fruits.unshift("Lemon", "Pineapple"); document.getElementById("demo").innerHTML = fruits;}</script><p><b>注意：</b> unshift() 方法在 Internet Explorer 8 及更早版本中无法正常工作：值将被插入，但返回值将是<em>未定义</em>。</p></body></html>