<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width,initial-scale=1">
    <title></title>
</head>
<body>
<script>
    const Image = window.Image;//定义global
</script>
<div id="app"></div>
</body>
</html>