创建数组使用 new Array()方法。
创建数组并赋值,简便写法如下:
var temp = ['java', 'php', 'c++', 'c#', 'perl', 'vb', 'html', 'css']
1、创建一个变量名为temp的数组;
2、为数组赋值,数组下标是从0开始,所以从0依次存储;
3、从数组中取出值,通过for循环,依次取出。
4.代码如下:
var temp = new Array()
temp[0] = "hello"
temp[1] = "my"
temp[1] = "friend"
for(var i = 0i <temp.lengthi++){
alert(temp[i])
}
1、push() 方法可向数组的末尾添加一个或多个元素,并返回新的长度。2、add() 方法用于向 <select> 添加一个 <option> 元素。
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:
<!DOCTYPE html>
<html>
<body>
<p id="demo">Click the button to add elements to the array.</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction()
{
var fruits = ["Banana", "Orange", "Apple", "Mango"]
fruits.unshift("Lemon","Pineapple")
var x=document.getElementById("demo")
x.innerHTML=fruits
}
</script>
<p><b>Note:</b>The unshift() method does not work properly in Internet Explorer 8 and earlier, the values will be inserted, but the return value will be <em>undefined</em>.</p>
</body>
</html>
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:
<!DOCTYPE html>
<html>
<body>
<p id="demo">Click the button to add elements to the array.</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction()
{
var fruits = ["Banana", "Orange", "Apple", "Mango"]
fruits.splice(2,0,"Lemon","Kiwi")
var x=document.getElementById("demo")
x.innerHTML=fruits
}
</script>
</body>
</html>
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:
<!DOCTYPE html>
<html>
<body>
<p id="demo">Click the button to add a new element to the array.</p>
<button onclick="myFunction()">Try it</button>
<script>
var fruits = ["Banana", "Orange", "Apple", "Mango"]
function myFunction()
{
fruits.push("Kiwi")
var x=document.getElementById("demo")
x.innerHTML=fruits
}
</script>
</body>
</html>
测试结果:
Banana,Orange,Apple,Mango,Kiwi
欢迎分享,转载请注明来源:内存溢出
评论列表(0条)