<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>点击后加1或减去1</title>
</head>
<body>
<span id="num">0</span>
<button onclick="document.getElementById(‘num‘).innerHTML++">点击加1</button>
<span id="num1">55</span>
<button onclick="document.getElementById(‘num1‘).innerHTML--">点击减1</button>
</body>
</html>
效果图：
时间： 2024-10-09 03:20:58