html 数组动态添加元素,js如何动态添加数组？

js动态添加数组可以按下面的步骤:

1、在数组的开头添加新元素 - unshift()

源代码:

Click the button to add elements to the array.

Try it

function myFunction()

{

var fruits = ["Banana", "Orange", "Apple", "Mango"];

fruits.unshift("Lemon","Pineapple");

var x=document.getElementById("demo");

x.innerHTML=fruits;

}

Note: The unshift() method does not work properly in Internet Explorer 8 and earlier, the values will be inserted, but the return value will be undefined.

测试结果:

Lemon,Pineapple,Banana,Orange,Apple,Mango

2、在数组的第2位置添加一个元素 - splice()

源代码:

Click the button to add elements to the array.

Try it

function myFunction()

{

var fruits = ["Banana", "Orange", "Apple", "Mango"];

fruits.splice(2,0,"Lemon","Kiwi");

var x=document.getElementById("demo");

x.innerHTML=fruits;

}

测试结果:

Banana,Orange,Lemon,Kiwi,Apple,Mango

3、数组的末尾添加新的元素 - push()

源代码:

Click the button to add a new element to the array.

Try it

var fruits = ["Banana", "Orange", "Apple", "Mango"];

function myFunction()

{

fruits.push("Kiwi")

var x=document.getElementById("demo");

x.innerHTML=fruits;

}

测试结果:

Banana,Orange,Apple,Mango,Kiwi