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<!DOCTYPE html> <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>