一直想用canvas写一个魂斗罗游戏，但是发现自己水平和学习能力差太多，收集好素材之后发现一个棍子英雄的小游戏挺火，就产生了写本文这个游戏的想法。直接上demo，建议在chrome下：点我。
简单说下写这个小游戏遇到的2个坑爹问题：
1.之前下的素材music.mp3这个文件，其实是3段音频。最后几秒是魂斗罗结束时的音乐，我想在结束的时候直接从调用最后几秒的音频。查了一下audio，很容易找到了audio的currentTime这个属性可以设置音频的播放位置。但是我本地测试的过程中，这个属性是一直不起作用的。后来百度（百度根本不好用），谷歌了半天才在stackoverflow上找到了一段描述，大概的意思就是需要一个sever环境，然后把测试环境放到了服务器环境就可以正常使用currentTime这个属性设置音频的播放起始位置了，一个大坑。
2.第二个大坑平时写transition的时候习惯的将transition-property写为all。比如transition:all 0s ease 0s;。在这个游戏中，当鼠标松开的时候棍子应该是以100% 100%的位置为远点进行旋转的。由于我写的是all，所以transfor-origin也产生了一个从默认的50% 50%到100% 100%的一个过渡过程，反应在页面上就是棍子开始明显转动的远点不是100% 100%的位置，但是动画完成到100%的时候原点是正确的。
剩下的就是逻辑实现，本来是想做到自适应和重置游戏的，最后多少都有点不足，重置游戏直接用刷新页面的暴力方式来解决了。页面有很多bug，不行就刷一次，哈哈。
直接上代码：
html部分：
<!DOCTYPE html> <html> <head lang="en"> <meta charset="UTF-8"> <title>Child'sPlay</title> <link href="style/style.css" rel="stylesheet" type="text/css"/> </head> <body> <div class="main" id="main"> <div id="score">当前得分<i class="current">0</i>分;最高得分<i class="top">0</i>分</div> <div class="bg"> <div class="move" id="move"> <div class="game-box" id="game_box"> <div class="contra" id="contra"></div> <div class="item" style="left: 0;"> <div class="land"><div class="stick" id="stick"></div> </div> </div> </div> </div> </div> </div> <div class="loading"> <progress id="progress" value="0" max="8"></progress> <h3>游戏方法:按住鼠标让棍子变长，使其放下的时候正好落入下一块陆地时放开鼠标。</h3> </div> <div class="begin"> <h3><i>点</i><i>击</i><i>键</i><i>盘</i><i>J</i><i>开</i><i>始</i><i>游</i><i>戏</i></h3> </div> <audio id="audio"> <source src="audio/start.mp3" type="audio/mpeg"/> </audio> <audio id="audio2"> <source src="audio/music.mp3" type="audio/mpeg"/> </audio> <audio id="audio3"> <source src="audio/Game_Over.mp3" type="audio/mpeg"/> </audio> <script src="js/jquery-1.11.1.min.js"></script> <script src="js/contra.js"></script> <script src="js/source.js"></script> <script src="js/record.js"></script> </body> </html>
css代码：
*{ margin: 0; padding: 0;}
body{ overflow: hidden;}
.loading{ position: absolute; left: 0; top: 0; right: 0; bottom: 0; z-index: 2; background: #000;}
#progress{ 100%; height: 200px;border: 1px solid #0064B4;background-color:#e6e6e6;}
progress::-webkit-progress-bar { background: #e6e6e6; }
progress::-webkit-progress-value { background: #0064B4; }
.loading h3{ text-align: center; color: #fff;}
.begin{ position: absolute; 100%; background: url("img/begin.jpg") 0 0 no-repeat; z-index: 3;}
.begin h3{ display: none; position: absolute; left: 0; top: 20px; 100%; text-align: center; color: #fff;}
.begin h3 i{
-webkit-animation: slide_letters 1.8s linear 1s infinite;
-moz-animation: slide_letters 1.8s linear 1s infinite;
-ms-animation: slide_letters 1.8s linear 1s infinite;
animation: slide_letters 1.8s linear 1s infinite}
.main{ position: absolute; left: 0; top: 0; right: 0; bottom: 0; overflow: hidden;}
#score{ position: absolute; left: 0; top: 50px; 100%; text-align: center; color: #fff;}
#score i{ color: red;}
.main .bg{ background: url("img/bg.png") 0 0 repeat-x;}
.land{ position: relative; float: left; background: url("img/land.png") 0 0 no-repeat; background-size: 100% 100%;}
.move{ position: relative; left: 0;}
.game-box{ position: fixed; bottom: 5%; 99999px;}
.game-box .item{ position: absolute; top: 0;}
#audio{ display: none; position: fixed; right: 20px; top: 20px;}
.contra{ background: url("img/contra.png"); 97px; height: 109px; position: absolute; left: 0; bottom: 65%; z-index: 9;}
.stick{ position: absolute; right: 0; bottom: 65%; 2px; background: gold; z-index: 99;}
.rolling{ transition: transform 1s ease-in 0s;transform-origin:center bottom; -webkit-transform-origin:center bottom; -webkit-transform: rotate(90deg); transform: rotate(90deg); }
.run{ 87px; height: 110px; background: url("img/run.png") 0px center no-repeat; overflow: hidden;-webkit-animation:run 1s steps(8) infinite;animation:run 1s steps(8) infinite;}
@-webkit-keyframes run{
100%{background-position: -696px 0px;}
}
@keyframes run{
100%{background-position: -696px 0px;}
}
.begin h3 i:nth-child(1) {
-webkit-animation-delay: 0.2s;
-moz-animation-delay: 0.2s;
-ms-animation-delay: 0.2s;
animation-delay: 0.2s;
}
.begin h3 i:nth-child(2) {
-webkit-animation-delay: 0.4s;
-moz-animation-delay: 0.4s;
-ms-animation-delay: 0.4s;
animation-delay: 0.4s;
}
.begin h3 i:nth-child(3) {
-webkit-animation-delay: 0.6s;
-moz-animation-delay: 0.6s;
-ms-animation-delay: 0.6s;
animation-delay: 0.6s;
}
.begin h3 i:nth-child(4) {
-webkit-animation-delay: 0.8s;
-moz-animation-delay: 0.8s;
-ms-animation-delay: 0.8s;
animation-delay: 0.8s;
}
.begin h3 i:nth-child(5) {
-webkit-animation-delay: 1s;
-moz-animation-delay: 1s;
-ms-animation-delay: 1s;
animation-delay: 1s;
}
.begin h3 i:nth-child(6) {
-webkit-animation-delay: 1.2s;
-moz-animation-delay: 1.2s;
-ms-animation-delay: 1.2s;
animation-delay: 1.2s;
}
.begin h3 i:nth-child(7) {
-webkit-animation-delay: 1.4s;
-moz-animation-delay: 1.4s;
-ms-animation-delay: 1.4s;
animation-delay: 1.4s;
}
.begin h3 i:nth-child(8) {
-webkit-animation-delay: 1.6s;
-moz-animation-delay: 1.6s;
-ms-animation-delay: 1.6s;
animation-delay: 1.6s;
}
.begin h3 i:nth-child(9) {
-webkit-animation-delay: 1.8s;
-moz-animation-delay: 1.8s;
-ms-animation-delay: 1.8s;
animation-delay: 1.8s;
}
@-webkit-keyframes slide_letters {
0%,50% { color: #fff; }
25% { color: red;}
}
@-moz-keyframes slide_letters {
0%,50% { color: #fff; }
25% { color: red;}
}
@-ms-keyframes slide_letters {
0%,50% { color: #fff; }
25% { color: red;}
}
@keyframes slide_letters {
0%,50% { color: #fff; }
25% { color: red;}
}
进度条加载source.js
var gameSource = {
"bg":"style/img/bg.png",
"contra":"style/img/contra.png",
"land":"style/img/land.png",
"run":"style/img/run.png",
"begin":"style/img/begin.jpg"
};
var loadNum = 0;
function loading(){
for(i in gameSource){
var obj = new Image();
obj.src = gameSource[i];
//console.log(gameSource[i])
obj.onload = function(){
console.log(this.src+" completed");
//gameSource.splice(i,1);
loadNum++;
$("#progress").attr({"value":loadNum});
};
}
}
loading()
var matchState = [1,1,1];
function checkState(){
var audioReadyState = [$("#audio")[0].readyState,$("#audio2")[0].readyState,$("#audio3")[0].readyState];
if(loadNum==8){
$("#progress").attr({"value":loadNum});
clearInterval(checkStateTimer);
contraHero.begin();
$("#audio")[0].play();
}
for(var i=0; i<audioReadyState.length;i++){
if(audioReadyState[i]==4 && matchState[i]){
matchState[i] = 0;
console.log("test",i,audioReadyState,matchState)
loadNum++;
console.log(audioReadyState);
}
}
}
var checkStateTimer = setInterval(checkState,1000);
//var a = [];
//alert(~a); // -1
//alert(+a); // 0
//alert(++a); // 1
//alert(!a); // false
localStorage保存得分记录
if(localStorage.TopScore){
$("#score .top").html(localStorage.TopScore);
}
function writeTopScore(score){
if(!localStorage.TopScore || score > localStorage.TopScore){
localStorage.TopScore = score;
$("#score .top").html(localStorage.TopScore);
}
}
contraHero主体逻辑代码
var contraHero = {
canPlay : false,
isOn:false,//标记按住鼠标
dom : {
contra : $("#contra"),
stick : $("#stick"),
main : $("#main"),
bg : $(".bg"),
move : $("#move"),
gameBox : $("#game_box"),
audio : $("#audio"),
audio2 : $("#audio2"),
item : $("#game_box .item")
},
data : {
landWidth : 0, //适配后一个陆地的宽度
landHeight :0 , //适配后一个陆地的高度
stickHeight:0, //棍子长度
stickLong : "", //棍子边长定时器
currentItem : 0, //魂斗罗当前所在的item索引
itemPosition : [[0,1]] //每片陆地的left值和对应的陆地数
},
init : function(){
this.initEvent();
this.initUnit();
this.makeNextLand();
this.mainTitle();
},
//getLastPositionLeft : function(){
// var n = contraHero.data.itemPosition.length-1;
// return contraHero.data.itemPosition[n][0] + contraHero.data.itemPosition[n][1]*contraHero.data.landWidth;
//},
makeNextLand : function(){
var left = parseInt(Math.random()*500) + contraHero.data.itemPosition[contraHero.data.itemPosition.length-1][1] * contraHero.data.landWidth
+ contraHero.data.itemPosition[contraHero.data.itemPosition.length-1][0];
console.log(contraHero.data.itemPosition[contraHero.data.itemPosition.length-1][1] * contraHero.data.landWidth,contraHero.data.itemPosition[contraHero.data.itemPosition.length-1][0],left,"left")
var landNo = parseInt(Math.random()*3)+1;
contraHero.data.itemPosition.push([left,landNo]);
var str = '';
for(var i=0;i<contraHero.data.itemPosition[contraHero.data.itemPosition.length-1][1];i++){
str +='<div class="land" style="'+contraHero.data.landWidth+'px;height:'+contraHero.data.landHeight+'px;">'+'</div>';
};
str ='<div class="item" style="left:'+contraHero.data.itemPosition[contraHero.data.itemPosition.length-1][0]+'px;height:'+contraHero.data.landHeight+'px;">'+str+'</div>';
contraHero.dom.gameBox.append(str);
},
increase : function(){
if(contraHero.isOn){
contraHero.data.stickLong = setInterval(function(){
contraHero.data.stickHeight +=3;
$("#stick").css({"height":contraHero.data.stickHeight+"px"})
},20)
}
},
initEvent : function(){
$(window).mousedown(function(){
contraHero.isOn = true;
contraHero.data.stickHeight = 0;
contraHero.increase()
});
$(window).mouseup(function(){
contraHero.isOn = false;
contraHero.data.stickHeight = $("#stick").height();
clearInterval(contraHero.data.stickLong);
contraHero.putDownStick();
});
$(window).resize(function(){
contraHero.initEvent();
contraHero.initUnit();
});
},
initUnit : function(){
var screenHeight = contraHero.dom.main.height();
var ratio = screenHeight/489;
var bgSizeWidth = parseInt(1284*ratio);
contraHero.data.landWidth = parseInt(34*ratio);
contraHero.data.landHeight = parseInt(122*ratio);
var gameBoxHeight = contraHero.dom.gameBox.height();
contraHero.dom.bg.css({"background-size":bgSizeWidth+"px "+screenHeight+"px","height":screenHeight+"px"});
$(".land").css({"width":contraHero.data.landWidth+"px","height":contraHero.data.landHeight+"px"});
contraHero.dom.gameBox.css({"height":contraHero.data.landHeight+"px"});
$(".begin").css({"background-size":"100% "+screenHeight+"px","height":screenHeight+"px","left":"100%"});
contraHero.begin();
},
check : function(){
var min = contraHero.data.itemPosition[contraHero.data.currentItem+1][0] - contraHero.data.itemPosition[contraHero.data.currentItem][0]
- contraHero.data.itemPosition[contraHero.data.currentItem][1] * contraHero.data.landWidth;
var max = min + contraHero.data.itemPosition[contraHero.data.currentItem+1][1] * contraHero.data.landWidth;
console.log(contraHero.data.currentItem,min,max,contraHero.data.stickHeight)
if(contraHero.data.stickHeight >=min && contraHero.data.stickHeight <= max){
return true;
}else{
return false;
}
},
begin: function () {
$(".begin").css({"background-size":"100% "+screen.height+"px","height":screen.height+"px","left":"100%"});
$(".begin").animate({"left":"0"},6400,function(){
$(".loading").remove();
$(".begin h3").show();
$(document).on("keyup",function(e){
e = e || window.e;
if(e.keyCode==74){
console.log("testet")
$(".begin").remove();
contraHero.init();
console.log("j")
$(document).off("keyup");
}
})
});
},
moveScreen : function(n){
var distance = -contraHero.data.itemPosition[n][0]
contraHero.dom.move.animate({"left":distance+"px"});
contraHero.dom.bg.animate({backgroundPositionX:distance});
},
mainTitle:function(){
contraHero.dom.audio2[0].play();
contraHero.loopMainTitleTimer = setInterval(this.checkMainTitle,1000);
},
checkMainTitle:function(){
var curTime = contraHero.dom.audio2[0].currentTime;
contraHero.dom.audio2[0].play();
if(curTime-64>=0){
contraHero.dom.audio2[0].load();
};
},
overMusic :function(){
//contraHero.dom.audio2[0].pause();
//contraHero.dom.audio2[0].currentTime = 140;
//contraHero.dom.audio2[0].play();
$("#audio3")[0].play();
},
putDownStick : function(){
$("#stick").addClass("rolling");
setTimeout(this.run,1000);
},
contraFixPosition : function(){
contraHero.dom.contra.animate({"left":contraHero.data.itemPosition[contraHero.data.currentItem][0] + contraHero.data.itemPosition[contraHero.data.currentItem][1] * contraHero.data.landWidth -70 +"px"});
console.log(contraHero.data.itemPosition[contraHero.data.currentItem][0],contraHero.data.itemPosition[contraHero.data.currentItem][1],"fix")
},
run : function(){
contraHero.dom.contra.addClass("run");
console.log(parseInt(contraHero.dom.contra.css("left")),contraHero.data.stickHeight,"wtf")
contraHero.dom.contra.animate({"left":parseInt(contraHero.dom.contra.css("left"))+contraHero.data.stickHeight+"px"},5*contraHero.data.stickHeight,function(){
if(contraHero.check()){
contraHero.data.currentItem++;
$("#score .current").html(contraHero.data.currentItem);
writeTopScore(contraHero.data.currentItem);
contraHero.contraFixPosition();
contraHero.moveScreen(contraHero.data.currentItem);
$("#stick").remove();
contraHero.dom.contra.removeClass("run");
contraHero.makeNextLand();
contraHero.dom.gameBox.find(".item").eq(contraHero.data.currentItem).find(".land:last").html('<div class="stick" id="stick"></div>');
}else{
//contraHero.dom.contra.removeClass("run");
//
//contraHero.reset();
//contraHero.init();
contraHero.killMusic();
contraHero.overMusic();
$("#stick").css({"transform":"rotate(180deg)"});
$("#contra").animate({"top":"1000px"},7000,function(){
location.reload();
});
}
})
},
killMusic:function(){
$("#audio")[0].pause();
$("#audio2")[0].pause();
$("#audio3")[0].pause();
clearInterval(contraHero.loopMainTitleTimer);
},
reset : function(){
contraHero.dom.contra.siblings(".item:gt(0)").remove();
$("#stick").removeClass("rolling").removeAttr("style");
contraHero.dom.contra.removeAttr("style");
contraHero.dom.bg.css({"background-position-x":"0"});
contraHero.dom.move.removeAttr("style");
contraHero.data.stickHeight = 0;
contraHero.data.itemPosition = [[0,1]];
}
}
最后附上下载包，渣代码，见笑。ContraHero