【數組】數組的增改查

2024-04-27 15:15:22

字體：大中小

來源：轉載

供稿：網友

1、給原數組中新增

用到 push 改變原數組的長度并返回新的長度，新元素添加在原數組的末尾

<doctype><html> <head>元素新增數組</head> <body> <div id="dem">點擊會給原素組末尾新增元素個數</div> <button onclick="funct()">點擊</button> <script type="text/javascript"> var app = ["001","002","002"]; function funct(){ app.push("003","0005"); var demo = document.getElementById("dem"); demo.innerHTML = app; } </script> </body></html>

unshift 在原數組的開頭添加一個新的元素或是更多的元素并返回新的長度。

<!doctype html ><html> <head></head> <body> <div id="dem">點擊會給原素組前面新增元素個數</div> <button onclick="funct()">點擊</button> <script type="text/Javascript"> var app = ["001","002","002"]; function funct(){ app.unshift("003","0005"); var demo = document.getElementById("dem"); demo.innerHTML = app; } </script> </body><html>

2、移除數組最后一個元素

pop() 并返回刪除的數組

<!doctype html><html> <head> </head> <body> <div id="demo">移除最后一個元素</div> <button onclick="fun()"></button> <script type="text/javascript" charset="utf-8"> var apple = ["001","002","003"]; function fun(){ apple.pop(); var demo = document.getElementsById("demo"); demo.innerHtml = apple; } </script> </body></html>

3.數組中的splice() 用于插入替換和刪除

會改變原數組

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"><head> <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"> <title>數組里面的push和pop </title> <script type="text/javascript" src="../js/jquery.min.js"></script></head><body> <div id="demo02">單擊刪除bing并tihuan一個元素</div> <button onclick="fun01()">刪除</button> <script type="text/javascript"> var apple = ["Sunday","Monday","Tuesday","Wednesday"]; function fun01(){ apple.splice(1,2,"2222"); //從Moday下標開始刪除兩個，替換為"2222" var demo = document.getElementById("demo02"); demo.innerHTML = apple; } </script></body></html>