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<!DOCTYPE html> <html> <body> <h2>JavaScript 数组方法</h2> <h2>unshift()</h2> <p>unshift() 方法返回新数组的长度：</p> <p id="demo1"></p> <p id="demo2"></p> <p id="demo3"></p> <script> var fruits = ["香蕉","橙子","苹果","芒果"]; document.getElementById("demo1").innerHTML = fruits; document.getElementById("demo2").innerHTML = fruits.unshift("Lemon"); document.getElementById("demo3").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，将插入值，但返回值将是<em>undefined</em>。</p> </body> </html>