Javascript小游戏
Javascript小游戏
提问于 2013-01-06 23:50:29
现在我正在学习一些Javascript，但现在有很多问题，因为我的技能很低。我需要一些帮助来解决代码中的几个问题。
我正在试着写一个叫“击鱼”的游戏。它有一个计时器，计分和onclick。只要点击一下，鱼就会消失，分数会增加1分。计时器限制为60秒。
下面是完整的代码。
<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之后走得太快了，点击按钮后鱼不会消失，分数也不会增加。
回答 1
Stack Overflow用户
回答已采纳
发布于 2013-01-07 03:43:11
没有特定的顺序。
(1)计数器的问题源于您调用它的方式以及存储countTimer变量的位置。因为您希望几个函数都能够访问countTimer，所以应该以所有函数都可以访问的方式声明它；最简单的方法是将其设置为全局变量，这只需使用
var countTimer;在脚本的顶部，并且在其他地方引用countTimer时不使用var。从函数nextThirteen调用函数start，然后再次启动设置计时器。这实际上是在旧的计时器上设置一个新的计时器，这就是为什么计数似乎加快了。
(2)您的html也是无效的，可能会导致一些问题，请务必关闭form和center标签。(不管怎样，你已经不再是not supposed to use the center tag了)。
(3)您的代码在head中，但在页面加载之前，大部分代码都会直接运行。因此，下面这行代码：
var score = document.getElementById("score");(在任何函数之外)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)函数one、two、three需要与表单中的输入具有不同的名称。这就是为什么所有的按钮都不工作的原因。
当您了解更多信息时，请注意以下几点：
- 避免重复。不需要所有的一、二、三个函数等等。你可以使用一个循环或单个事件处理程序来找出哪个按钮被按下了。
- 使用浏览器的控制台来检查正在产生的错误。您的代码导致了错误object is not a function，而我正是通过searching for that找出了按钮不是关于函数的原因
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/14183790
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