做一个点击按钮就会弹出你好提示框的H5页面
<!DOCTYPE html>
<html>
<head>
<title>点击按钮弹出提示框</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<button onclick="sayHello()">点击我</button>
<script>
function sayHello() {
alert("你好！");
}
</script>
</body>
</html>
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