为什么实现不了讲课的效果

Question

var WINDOW_HEIGHT = 768;var RADIUS = 8;var MARGIN_TOP = 60;var MARGIN_LEFT = 30;const endTime = new Date(2014,6,11,18,47,52);var curShowTimeSeconds = 0window.onload = function(){    var canvas = document.getElementById('canvas');    var context = canvas.getContext("2d");    canvas.width = WINDOW_WIDTH;    canvas.height = WINDOW_HEIGHT;    curShowTimeSeconds = getCurrentShowTimeSeconds()    render( context )}function getCurrentShowTimeSeconds() {    var curTime = new Date();    var ret = endTime.getTime() - curTime.getTime();    ret = Math.round( ret/1000 )    return ret >= 0 ? ret : 0;}function render( cxt ){    var hours = parseInt( curShowTimeSeconds / 3600);    var minutes = parseInt( (curShowTimeSeconds - hours * 3600)/60 )    var seconds = curShowTimeSeconds % 60    renderDigit( MARGIN_LEFT , MARGIN_TOP , parseInt(hours/10) , cxt )    renderDigit( MARGIN_LEFT + 15*(RADIUS+1) , MARGIN_TOP , parseInt(hours%10) , cxt )    renderDigit( MARGIN_LEFT + 30*(RADIUS + 1) , MARGIN_TOP , 10 , cxt )    renderDigit( MARGIN_LEFT + 39*(RADIUS+1) , MARGIN_TOP , parseInt(minutes/10) , cxt);    renderDigit( MARGIN_LEFT + 54*(RADIUS+1) , MARGIN_TOP , parseInt(minutes%10) , cxt);    renderDigit( MARGIN_LEFT + 69*(RADIUS+1) , MARGIN_TOP , 10 , cxt);    renderDigit( MARGIN_LEFT + 78*(RADIUS+1) , MARGIN_TOP , parseInt(seconds/10) , cxt);    renderDigit( MARGIN_LEFT + 93*(RADIUS+1) , MARGIN_TOP , parseInt(seconds%10) , cxt);}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*(RADIUS+1)+(RADIUS+1) , y+i*2*(RADIUS+1)+(RADIUS+1) , RADIUS , 0 , 2*Math.PI )                cxt.closePath()                cxt.fill()            }}

Answer 1

给一个完整的代码来看看，你这代码实在跑不起来。