var?Window_Width?=?1024;
var?window_Height?=?768;
var?Radius?=?8;

window.onload?=?function(){
	var?canvas?=?document.getElementById("canvas");
	var?context?=?canvas.getContext("2d");

	canvas.width?=?Window_Width;
	canvas.height?=?window_Height;

	render(context);
}

function?render(){
	var?hours?=?12;
	var?minutes?=?34;
	var?seconds?=?56;

	renderDigit(0,0,parseInt(hours/10),cxt);
}

function?renderDigit(x,y,num,cxt){
	cxt.fillStyle?=?"blue";

	for(var?i=0;i<digit[num].lenght;i++){
		for(var?j=0;j<digit[num][i].lenght;j++){
			if(digit[num][i]?==?1){
				cxt.beginPath();
				cxt.art(x+(Radius+1)+2*(Radius+1),y+(Radius+1)+2*(Radius+1),Radius,0,2*Math.PI);
				cxt.closePath();

				cst.fill();
			}
		}
	}
}

為什么我的沒顯示？F12說renderDigit(0,0,parseInt(hours/10),cxt);的cxt有問題