編輯代碼:
查看結果 »
試一試 - ©
w3ii.com
<!DOCTYPE html> <html> <body> <p>Adding elements with high indexes can create undefined "holes" in an array.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> var fruits = ["Banana", "Orange", "Apple", "Mango"]; document.getElementById("demo").innerHTML = fruits; function myFunction() { fruits[10] = "Lemon"; document.getElementById("demo").innerHTML = fruits[8]; } </script> </body> </html>