<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
</head>
<body>
<p id="demo0">删除最后一个元素</p>
<p id="demo1">数组最后添加一个元素</p>
<p id="demo2">指定索引添加元素</p>
<p id="demo3">指定索引删除元素</p>
<button onclick="myFunction()">点我</button>
<script>
function myFunction() {
var arr0 = ["1", "2", "3", "4"];
arr0.pop();
document.getElementById("demo0").innerHTML = arr0;
var arr1 = ["1", "2"];
arr1.push("3");
document.getElementById("demo1").innerHTML = arr1;
var arr2 = ["1", "3"];
arr2.splice(1, 0, "2");
document.getElementById("demo2").innerHTML = arr2;
var arr3 = ["1", "4", "2", "3"];
arr3.splice(1, 1);
document.getElementById("demo3").innerHTML = arr3;
}
</script>
</body>
</html>