var can1;

var can2;

var ctx1;

var ctx2;

document.body.onload=game;

function game()

{

init();

}

function init()

{

//獲得canvas context

can1=document.getElementById("canvas1");//fishes,dust,UI,circle

ctx1=can1.getContext();

can2=document.getElementById("canvas2");//background,ane ,fruits

ctx2=can2.getContext();

}