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<!DOCTYPE html> <html> <body> <h1>Array.push() - 返回值</h1> <p>push() 方法将新项目添加到数组的末尾。</p> <p>此示例演示 push() 方法如何在插入后返回数组的长度。</p> <button onclick="myFunction()">提示数组长度</button> <p>数组：</p> <p id="demo"></p> <script> var fruits = ["香蕉","橙子","苹果","芒果"]; document.getElementById("demo").innerHTML = fruits; function myFunction() { var x = fruits.push("Kiwi"); alert(x); document.getElementById("demo").innerHTML = fruits; } </script> </body> </html>