用JavaScript写一个猜拳小游戏

代码如下：
<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title></title>

	</head>
	<body>
		<table  align="center"  id="tab" cellpadding="0" cellspacing="0" border="1" bordercolor="black" width="500px" height="500px">
			<tr height="200px">
			<td align="center" width="200"><p>你</p><br>
			<img id="m1" src="img/ph.jpg">
			</td>
			<td align="center"><p style="font-size: 50px;color: yellow;"><b>vs</b></p></td>
			<td align="center" width="200"><p>电脑</p><br>
			<img id="m2" src="img/ph.jpg" >
			</td>
			</tr>
			<tr align="center" height="100px">
				<td colspan="3">
					<p><font color="coral" size="7"><b id="j">Are you ready?</b></font></p></td>
				</tr>
			<tr height="200px">
				<td align="center" width="200">
				<p>你选择了：</p><br/>
			    <img id="mg" src="img/ph.jpg">
				</td>
				<td align="center" style="font-size:30px;color: yellow;"><b>choice</b></td>
				<td align="center" width="200">
					<form id="form1" name="form1">
						请选择出拳：
						<select id="xz" name="xz" onchange="sele()">
							<option value="">请选择</option>
							<option value="0">拳头</option>
							<option value="1">剪刀</option>
							<option value="2">布</option>
							
						</select><br />
						<button type="button" onclick="tj()">选好了，出拳</button><br />
						<button type="rese">重新再来</button>
					</form>
				</td>
			</tr>
			<tr height="100px">
				<td colspan="3" align="center">
					<p>总数：<span id="s1"></span>&nbsp;&nbsp;&nbsp;赢：<span id="s2"></span>&nbsp;&nbsp;&nbsp;输：<span id="s3"></span>&nbsp;&nbsp;&nbsp;平：<span id="s4"></span></p>
					<button type="button" onclick="he()">显示比赛结果</button>
				</td>
			</tr>
		</table>
	</body>
	<script type="text/javascript">
	      var sheng=0;
	      var bai=0;
	      var ping=0;
	      var sum=0;
			function sele(){
				var a=document.getElementById("xz");
				var aa=document.getElementById("mg");
				var b=a.value;
				if(b=="0"){
					aa.src="img/st.jpg";
				}else if(b=="1"){
					aa.src="img/jd.jpg";
				}else if(b=="2"){
					aa.src="img/bu.jpg";
				}else{
					aa.src="img/ph.jpg";
				}
			}
			function tj(){
			var a=document.getElementById("xz");
			var c1=document.getElementById("m1");
			var c2=document.getElementById("m2");
			var b=a.value;
			
			if(b=="0"){
					c1.src="img/st.jpg";
				}else if(b=="1"){
					c1.src="img/jd.jpg";
				}else if(b=="2"){
					c1.src="img/bu.jpg";
				}else{
					alert("请选择！再出拳");
					return false;
				}
			
			var num3=parseInt(b);
			var num=Math.round(Math.random()*10);
			var num2=num%3;
				if(num2==0){
					c2.src="img/st.jpg";
				}else if(num2==1){
					c2.src="img/jd.jpg";
				}else if(num2==2){
					c2.src="img/bu.jpg";
				}
				//判断猜拳
				var ts=document.getElementById("j")
				var ss=num3-num2;
				if(ss==0){
					ts.innerText="平";
					ping++;
				}else if(ss==-1||ss==2){
					ts.innerText="胜";
					sheng++;
				}else{
					ts.innerText="败";
					bai++;
				}
			}
			function he(){
				var w1=document.getElementById("s1");
				var w2=document.getElementById("s2");
				var w3=document.getElementById("s3");
				var w4=document.getElementById("s4");
				sum=sheng+bai+ping;
				w1.innerText=sum;
				w2.innerText=sheng;
				w3.innerText=bai;
				w4.innerText=ping;
			}
	</script>
</html>
样图
图便资源：
用JavaScript写一个猜拳小游戏

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