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
js 动态添加li代码:
<ul id="parentUl"><li>原li</li></ul>
function addElementLi(obj) {var ul = document.getElementById(obj) //添加 livar li = document.createElement("li") //设置 li 属性,如 idli.setAttribute("id", "newli") li.innerHTML = "js 动态添加li"ul.appendChild(li)}调用:addElementLi("parentUl")
用 js 动态添加元素,就不会有那么复杂的字符串出现,代码阅读性强一点,也容易理解。用代码的方式在js中给li附上标签。
一、js 动态添加元素div:
<div id="parent"></div> function addElementDiv(obj) {var parent = document.getElementById(obj) //添加 divvar div = document.createElement("div") //设置 div 属性,如 iddiv.setAttribute("id", "newDiv") div.innerHTML = "js 动态添加div"parent.appendChild(div)}调用:addElementDiv("parent")
二、js 动态添加元素img:
<ul id="parentUl"></ul>
function addElementImg(obj) {var ul = document.getElementById(obj) //添加 livar li = document.createElement("li") //添加 imgvar img = document.createElement("img") //设置 img 属性,如 idimg.setAttribute("id", "newImg") //设置 img 图片地址img.src = "/images/prod.jpg" li.appendChild(img)ul.appendChild(li)}调用:addElementImg("parentUl")
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