javascript – 如何使用Canvas放置一个gif

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我正在制作一款游戏,在我的游戏中,当HERO停留在MONSTER附近时,会显示一个GIF来吓唬玩家.但我不知道该怎么做.我试图把 PHPHTML代码,但它不起作用…函数是AtualizaTela2().这是我的主要代码
<!DOCTYPE HTML>
<html>
<head>
<title>Hero's Escape Game</title>
<script language="JavaScript" type="text/javascript">

var objCanvas=null; // object that represents the canvas
var objContexto=null; 

// Hero positioning control
var xHero=300;
var yHero=100;

// Monster positioning control
var xMonster=620;
var yMonster=0;

var imgFundo2 = new Image();
imgFundo2.src = "Images/Pista2.png";

var imgMonster = new Image();
imgMonster.src = "Images/Monster.png";

var imgHero = new Image();
imgHero.src = "Images/Hero.png";

function AtualizaTela2(){

if((xHero >= xMonster-10)&&(xHero <= xMonster + 10))
{

/*gif here*/

}

objContexto.drawImage(imgFundo2,0);
objContexto.drawImage(imgHero,xHero,yHero);
objContexto.drawImage(imgMonster,xMonster,yMonster);

function Iniciar(){

objCanvas = document.getElementById("meuCanvas");
objContexto = objCanvas.getContext("2d");
AtualizaTela2();

}

/* the function HeroMovement() and MonsterMovement() are not here */

}

</script>
</head>
<body onLoad="Iniciar();" onkeydown="HeroMovement(event);">

<canvas id="meuCanvas" width="1233"
height="507"
style="border:1px solid #000000;">
Seu browser não suporta o elemento CANVAS,atualize-se!!!
</canvas><BR>
</body>
</html>

这是简化的代码,因为真正的代码非常大!

谢谢您的帮助!

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