我寫第二個數字的時候，只出來第一個；然后我把第一個注釋掉，就只出來第二個，第三個數字也不出。 ?也就是 這個renderDigit 只調用了一次！我看老師的代碼沒有特殊處理呀！求解

renderDigit(MARGIN_LEFT, MARGIN_TOP, parseInt(hour/10), context);

renderDigit(MARGIN_LEFT+15*(r+1),MARGIN_TOP,parseInt(hour%10),context);

renderDigit(MARGIN_LEFT+30*(r+1),MARGIN_TOP,10,context);

完整代碼：

// JavaScript Document

var WINDOW_WIDTH = 1000;

var WINDOW_HEIGHT = 700;

var MARGIN_LEFT = 100;

var MARGIN_TOP = 50

var r = 5;

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(context){

var hour = 14;

var minute = 36;

var second = 59;

renderDigit(MARGIN_LEFT, MARGIN_TOP, parseInt(hour/10), context);

renderDigit(MARGIN_LEFT+15*(r+1),MARGIN_TOP,parseInt(hour%10),context);

renderDigit(MARGIN_LEFT+30*(r+1),MARGIN_TOP,10,context);

}

function renderDigit(x, y, num, cxt){

cxt.fillStyle = "rgb(0,102,153)";

for(var i=0; i<=digit[num].length; i++){

for(var j=0; j<=digit[num][i].length;j++){

if(digit[num][i][j] == 1){

cxt.beginPath();

cxt.arc( x+j*2*(r+1)+(r+1), y+i*2*(r+1)+(r+1), r, 0, 2*Math.PI );

cxt.closePath();

cxt.fill();

}

}

}

}