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
如果需要用原生js动态的加载另外一个js文件，可以使用原生js的document.createElement方法创建script节点，然后更改该节点的type和src属性,最后通过appendChild方法将该节点动态添加到html中，这样就可以了，参考代码如下：var new_element = document.createElement("script")//创建新的script节点new_element.setAttribute("type", "text/javascript")new_element.setAttribute("src", "../js/jquery.js")document.body.appendChild(new_element)//添加到body节点的末尾
上例中是在body的最末尾添加的，当然同样可以在head中添加引用该js的标签：document.head.appendChild(new_element)
