Javascript小游戏
问题描述:
现在我正在学习一些Javascript,但由于我的技能很低,现在遇到了很多问题。在这段代码中,我需要一些帮助来解决几个问题。Javascript小游戏
我想写一个名为“打鱼”的游戏。它有一个计时器,分数和onclick。当点击鱼应该消失,1分将被添加到比分中。有一个60秒的计时器限制。
这是整个代码。
<html>
<head>
<title>
Hit the fish!
</title>
<style>
table{
margin-left: auto;
margin-right: auto;
width: 70%;
height: 90%;
background-color:#66ff00;
}
#playground input{
position: inherit;
height: 100px;
width: 100px;
margin-left: 20px;
margin-right: 20px;
margin-bottom: 20px;
}
#input {
height:40px;
}
#area {
background-color:#888;
position:absolute;
left:0px;
right:0px;
top:50px;
bottom:0px;
}
#area button {
width:150px;
height:30px;
position:absolute;
}
.red {
color:red;
}
</style>
<script language="Javascript">
function one() {
document.play.one.value="";
// get the counter element
var score = document.getElementById("score");
// get it's value
var value = parseInt(score.innerHTML);
// increase it
value = value + 1;
// write the new value back
score.innerHTML=value;
}
function two() {
document.play.two.value="";
// get the counter element
var score = document.getElementById("score");
// get it's value
var value = parseInt(score.innerHTML);
// increase it
value = value + 1;
// write the new value back
score.innerHTML=value;
}
function three() {
document.play.three.value="";
// get the counter element
var score = document.getElementById("score");
// get it's value
var value = parseInt(score.innerHTML);
// increase it
value = value + 1;
// write the new value back
score.innerHTML=value;
}
function four() {
document.play.four.value="";
// get the counter element
var score = document.getElementById("score");
// get it's value
var value = parseInt(score.innerHTML);
// increase it
value = value + 1;
// write the new value back
score.innerHTML=value;
}
function five() {
document.play.five.value="";
// get the counter element
var score = document.getElementById("score");
// get it's value
var value = parseInt(score.innerHTML);
// increase it
value = value + 1;
// write the new value back
score.innerHTML=value;
}
function six() {
document.play.six.value="";
// get the counter element
var score = document.getElementById("score");
// get it's value
var value = parseInt(score.innerHTML);
// increase it
value = value + 1;
// write the new value back
score.innerHTML=value;
}
function seven() {
document.play.seven.value="";
// get the counter element
var score = document.getElementById("score");
// get it's value
var value = parseInt(score.innerHTML);
// increase it
value = value + 1;
// write the new value back
score.innerHTML=value;
}
function eight() {
document.play.eight.value="";
// get the counter element
var score = document.getElementById("score");
// get it's value
var value = parseInt(score.innerHTML);
// increase it
value = value + 1;
// write the new value back
score.innerHTML=value;
}
function nine() {
document.play.nine.value="";
// get the counter element
var score = document.getElementById("score");
// get it's value
var value = parseInt(score.innerHTML);
// increase it
value = value + 1;
// write the new value back
score.innerHTML=value;
}
function count()
{
stop();
// get the counter element
var counter = document.getElementById("counter");
// get it's value
var value = parseInt(counter.innerHTML);
// increase it
value = value + 1;
// write the new value back
counter.innerHTML=value;
// limitation
if(value===60){
alert("Time Out!");
clearInterval(countTimer);
document.getElementById("counter").innerHTML="0";
document.getElementById("score").innerHTML="0";
}
}
function start() {
stop();
var countTimer = setInterval("count()",1000);
document.play.four.value=">( °3°)";
document.play.three.value=">( °3°)";
setTimeout("nextone()");
var score = document.getElementById("score");
}
function score(){
// get the counter element
var score = document.getElementById("score");
// get it's value
var value = parseInt(score.innerHTML);
// increase it
value = value + 1;
// write the new value back
score.innerHTML=value;
}
function nextone() {
document.play.four.value="";
document.play.five.value=">( °3°)";
setTimeout("nexttwo()",400);
}
function nexttwo() {
document.play.three.value="";
setTimeout("nextthree()",400);
}
function nextthree() {
document.play.seven.value=">( °3°)";
document.play.one.value=">( °3°)";
document.play.six.value=">( °3°)";
setTimeout("nextfour()",700);
}
function nextfour() {
document.play.one.value="";
document.play.six.value="";
document.play.two.value=">( °3°)";
setTimeout("nextfive()",700);
}
function nextfive() {
document.play.seven.value="";
document.play.two.value="";
document.play.four.value=">( °3°)";
setTimeout("nextsix()",800);
}
function nextsix() {
document.play.eight.value=">( °3°)";
document.play.two.value=">( °3°)";
setTimeout("nextseven()",700);
}
function nextseven() {
document.play.eight.value="";
document.play.five.value=">( °3°)";
setTimeout("nexteight()",400);
}
function nexteight() {
document.play.nine.value=">( °3°)"
document.play.four.value=">( °3°)";
setTimeout("nextnine()",500);
}
function nextnine() {
document.play.five.value="";
document.play.four.value="";
document.play.one.value=">( °3°)";
setTimeout("nextten()",200);
}
function nextten() {
document.play.three.value=">( °3°)";
document.play.six.value=">( °3°)";
setTimeout("nexteleven()",600);
}
function nexteleven() {
document.play.one.value="";
document.play.seven.value=">( °3°)";
setTimeout("nexttwelve()",500);
}
function nexttwelve() {
document.play.two.value=">( °3°)";
document.play.nine.value=">( °3°)";
setTimeout("nextthirteen()",700);
}
function nextthirteen() {
document.play.one.value=">( °3°)";
document.play.nine.value="";
document.play.seven.value="";
setTimeout("start()",600);
}
function stop() {
clearInterval(countTimer);
document.play.one.value="";
document.play.two.value="";
document.play.three.value="";
document.play.four.value="";
document.play.five.value="";
document.play.six.value="";
document.play.seven.value="";
document.play.eight.value="";
document.play.nine.value="";
}
function reset()
{
document.getElementById("counter").innerHTML="0";
document.getElementById("score").innerHTML="0";
}
// get the counter element
var score = document.getElementById("score");
// get it's value
var value = parseInt(score.innerHTML);
// increase it
value = value + 1;
// write the new value back
score.innerHTML=value;
</script>
</head>
<body>
<div id="input">
<button onclick="start()">start</button>
<button onclick="stop()">stop</button>
<button onclick="reset()">reset</button>
<div style="font-size:10em" id="counter">0</div><br>
<p>Your score:</p><div style="font-size:5em" id="score">0</div>
<script>
var countTimer = setInterval('count()',1000);
</script>
</div>
<div id="playground">
<table border=100 cellpadding=0 cellspacing=0>
<tr>
<td>
<form name="play">
<center>
<INPUT TYPE="button" NAME="one" OnClick="one()" id="one" value=" ">
<INPUT TYPE="button" NAME="two" OnClick="two()" id="two" value=" ">
<INPUT TYPE="button" NAME="three" OnClick="three()" id="three" value=" ">
<br>
<INPUT TYPE="button" NAME="four" OnClick="four()" id="four" value=" ">
<INPUT TYPE="button" NAME="five" OnClick="five()" id="five" value=" ">
<INPUT TYPE="button" NAME="six" OnClick="six()" id="six" value=" ">
<br>
<INPUT TYPE="button" NAME="seven" OnClick="seven()" id="seven" value=" ">
<INPUT TYPE="button" NAME="eight" OnClick="eight()" id="eight" value=" ">
<INPUT TYPE="button" NAME="nine" OnClick="nine()" id="ten" value=" ">
<br>
</td>
</tr>
</table>
</div>
</body>
</html>
问题是计数器在20-30之后变得太快,点击按钮后鱼不会消失,并且分数上没有加分。
答
没有特定的顺序...
(1)与计数器的问题是由于你怎么称呼它,并在那里你存储countTimer
变量的方式。因为您希望多个功能能够访问countTimer
,所以您应该以他们可以访问它的方式声明它;最简单的方法是,它是一个全局变量,你可以参考其他地方countTimer
使用时有var
var countTimer;
在脚本的顶部,不只是做。您可以从功能nextThirteen
调用功能start
,然后开始重新设置定时器。它所做的实际上是在旧的计时器上设置一个新的计时器,这就是计数似乎加快的原因。
(2)您的html也是无效的,这可能会导致一些问题;确保你关闭了form
和center
标签。 (无论如何,你都是not supposed to use the center
tag)。
(3)您的代码在head
中,但大部分代码在页面加载之前立即运行。因此,下列行:
var score = document.getElementById("score");
(任何函数的外部)都会导致错误,因为元素分数尚未写入。避免这种情况的最简单方法是将脚本放在页面主体的末尾。
(4)功能one
,two
,three
需要与表单中的输入名称不同。这就是为什么没有按钮的工作。
一些常规的点,你了解更多:
- 避免重复。不需要所有的一个,两个,三个函数等。您可以使用循环或单个事件处理函数来查找哪个按钮已被按下。
- 使用您的浏览器的控制台来检查正在产生的错误。您的代码导致错误对象不是函数和searching for that是我如何找出为什么按钮不起作用。
- 了解variable scope
这里是一个[的jsfiddle(http://jsfiddle.net/6daVU/),使人们可以测试它。(我做了一个小改动 - 在顶部声明了'countTimer',这样所有的函数都可以访问它。) – Stuart