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console 命令行工具 X clear 

                    

                        
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console

            
console.log(THREE)

            
<!DOCTYPE html>
<html lang="en">

<head>
	<meta charset="UTF-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>楼层分层-动画调研</title>

	<style>
		html,
		body {
			margin: 0;
			border: 0;
			width: 100%;
			height: 100%;
		}

		button {
			position: absolute;
			left: 10%;
		}
	</style>
</head>

<body>
	<button> 退出</button>
</body>

</html>

            

                
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