点击运行
<!DOCTYPE html> <html> <body> <h1>JavaScript 数组</h1> <p>如果在访问数组时使用命名索引，JavaScript 会将数组重新定义为标准对象，并且某些数组方法和属性将产生未定义或不正确的结果。</p> <p id="demo"></p> <script> var person = []; person["firstName"] = "John"; person["lastName"] = "Doe"; person["age"] = 46; document.getElementById("demo").innerHTML = person[0] + " " + person.length; </script> </body> </html>
运行结果
