pe="text/javascript">

	var isDrawing = false;
	var lastX = 0;
	var lastY = 0;

	var canvas = document.getElementById("canvas");
	var context = canvas.getContext("2d");
	context.fillStyle = '#000000'; // 黑色
	context.fillRect(0, 0, canvas.width, canvas.height);
	context.lineWidth = 30;
	context.lineCap = "round";
	context.lineJoin = "round";
	context.strokeStyle = "white";

	function draw(e) {
		if (!isDrawing) return;
		e.preventDefault(); // 阻止滚动等默认行为

		var newX, newY;
		if (e.type.i