使用jquery实现别踩白块小游戏的方法实例
目录
- 前言
- html
- 首页字体
- 中间的表格
- 实现每一行的黑块随机显示
- 按键事件
- key事件
- adds
- speedup
- 源码
- 总结
前言
掘金真的是太懂了,写游戏的活动,想不参加都难!第一个,别踩白块!
先来看效果~
如上图所示,jkl三个键对应三列,左上是得分,得分右边是时间(没做倒计时。。。)敲击对应的按键来进行游戏,如果敲错了就会弹出得分与所用时间
接下来就开始肢解这个小游戏,来一步一步的分析究竟是怎么实现的,let's go~
html
<body> <div class="main"> <div id="score">0</div> <div id="time">00:00:00</div> </div> <div class="caption">别踩白块!</div> <div class="container"> <table id="tab"> <tr> <td></td> <td></td> <td></td> </tr> <tr> <td></td> <td></td> <td></td> </tr> <tr> <td></td> <td></td> <td></td> </tr> <tr> <td></td> <td></td> <td></td> </tr> </table> <span class="font one">J</span> <span class="font two">K</span> <span class="font three">L</span> </div> </body>
其他地方就是普通的div,中间的主体部分是用表格实现的,jkl置于表格的上方显示
首页字体
width: 300px; font-size: 60px; font-weight: bold; text-align: center; position: relative; margin: 0 auto; -webkit-text-fill-color: transparent; /*文字的填充色*/ -webkit-text-stroke: 1.2px white;
重点的两个属性:最后两个属性-webkit-text-fill-color
和-webkit-text-stroke
,第一个是文字的填充颜色,第二个是文字的边框颜色,最终形成这种效果
中间的表格
主体用的是table做的,四行三列,每一行都有一个黑块在随机的一列生成
Math.ceil(Math.random() * 3) - 1
Math.random()
会取0-1的随机小数,乘3是为了获取1-3内的随机小数,Math.ceil()
向上取整,在减1,最后可以拿到三个可能的结果:0 1 2
实现每一行的黑块随机显示
新建dom元素hang
var Game={ ... hang: document.getElementsByTagName('tr'); ... }
为每一行的随机列添加黑块
//获取列--------------------------------------------- Game.hang[0].children[Math.ceil(Math.random() * 3) - 1].style.background = 'black'; Game.hang[1].children[Math.ceil(Math.random() * 3) - 1].style.background = 'black'; Game.hang[2].children[Math.ceil(Math.random() * 3) - 1].style.background = 'black'; Game.hang[3].children[Math.ceil(Math.random() * 3) - 1].style.background = 'black';
按键事件
键盘按下事件调用了两个方法,一个是主方法key事件,另外一个是负责显示jkl的color事件
key事件
key: function () { onkeydown = function (event) { if (Game.bool == true && (event.key == 'j' || event.key == 'k' || event.key == 'l')) { Game.int = setInterval(Game.times, 10); Game.bool = false; } switch (event.key) { case 'j': if (Game.hang[3].children[0].style.background == 'black') { Game.speed(); Game.scores(); } else { Game.over(); Game.begin() } break; case 'k': if (Game.hang[3].children[1].style.background == 'black') { Game.speed(); Game.scores(); } else { Game.over(); Game.begin() } break; case 'l': if (Game.hang[3].children[2].style.background == 'black') { Game.speed(); Game.scores(); } else { Game.over(); begin() } break; } Game.color(); } }
第一块if语句负责控制游戏的开始和结束,当按下的按键是jkl的时候游戏开始,Game.times是一个计时器的方法,每一秒去执行一下
times
times: function () { Game.mis += 1; if (Game.mis > 99) { Game.mis = 0; Game.sec += 1; } if (Game.sec > 59) { Game.sec = 0; Game.min += 1; } if (Game.min > 23) { Game.min = 0; } Game.begin(); },
switch语句里为主要逻辑,每个按键分为成功和失败,如果当前按下的按键为黑色的话,执行speed方法和score方法
speed方法
speed: function () { Game.adds(); Game.speedup(); // 下面有介绍 },
score方法
scores: function () { Game.score += 1; Game.sco.innerHTML = Game.score; },
将已经定好的score +1,返回给页面
如果判断按下的按钮不是黑块的话,执行结束的操作,即调用over()和begin()
over方法
over: function () { alert('游戏结束,得分:' + Game.score + ';用时' + Game.time.innerHTML); clearInterval(Game.int); Game.mis = 0; Game.sec = 0; Game.min = 0; Game.score = 0; Game.sco.innerHTML = Game.score; Game.time.innerHTML = (Game.min < 10 ? "0" + Game.min : Game.min) + ":" + (Game.sec < 10 ? "0" + Game.sec : Game.sec) + ":" + (Game.mis < 10 ? "0" + Game.mis : Game.mis); Game.bool = true; },
显示游戏结束的提示,将计时器,分数,游戏状态置为初始化,以便下次的重新开始
adds
adds: function () { Game.tab.insertRow(0); for (var i = 0; i < 3; i++) { Game.hang[0].insertCell(); } Game.hang[0].children[Math.ceil(Math.random() * 3) - 1].style.background = 'black'; },
此方法与下面的方法就是表格往下移动的主要函数
- 在最上面新增一行tr
- 给tr循环插入三个td
- 给三个td的随机一个设置为黑色
speedup
speedup: function () { if (Game.btn == 0 || Game.btn % 150 != 0) { Game.tab.style.bottom = -Game.btn - 5 + 'px'; Game.btn += 5; setTimeout(Game.speedup, 1); } else { clearTimeout(Game.speedup); Game.btn += 5; } },
speedup方法给予了向下移动时的动画效果
源码
直接扔进一个html里就能玩
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>实验</title> <style> * { margin: 0; padding: 0; box-sizing: border-box; } body { width: 100%; margin: 0 auto; background: linear-gradient(-45deg, purple, blue); } .container { margin: 0 auto; width: 470px; height: 630px; overflow: hidden; position: relative; } table { width: 464px; height: 612px; position: absolute; right: 0; bottom: 0; border-collapse: collapse; } td { width: 150px; height: 150px; border: 6px solid pink; } .main { color: white; text-align: center; /* vertical-align: middle; */ font-size: 50px; position: absolute; top: 0; left: 0; } #score { display: inline-block; padding-right: 200px; } #time { display: inline-block; } .caption { width: 300px; font-size: 60px; font-weight: bold; text-align: center; position: relative; margin: 0 auto; -webkit-text-fill-color: transparent; /*文字的填充色*/ -webkit-text-stroke: 1.2px white; } .font { color: transparent; display: inline-block; font-size: 60px; font-weight: bold; position: absolute; } .one { left: 14.5%; top: 81%; } .two { left: 45%; top: 81%; } .three { left: 79%; top: 81%; } </style> </head> <body> <div class="main"> <div id="score">0</div> <div id="time">00:00:00</div> </div> <div class="caption">别踩白块!</div> <div class="container"> <table id="tab"> <tr> <td></td> <td></td> <td></td> </tr> <tr> <td></td> <td></td> <td></td> </tr> <tr> <td></td> <td></td> <td></td> </tr> <tr> <td></td> <td></td> <td></td> </tr> </table> <span class="font one">J</span> <span class="font two">K</span> <span class="font three">L</span> </div> </body> <script> var Game = { // 属性 int: null, mis: 0, sec: 0, min: 0, score: 0, bool: true, btn: 0, tab: document.getElementsByTagName('table')[0], font: document.getElementsByTagName('span'), sco: document.getElementById('score'), time: document.getElementById('time'), hang: document.getElementsByTagName('tr'), // 方法 times: function () { Game.mis += 1; if (Game.mis > 99) { Game.mis = 0; Game.sec += 1; } if (Game.sec > 59) { Game.sec = 0; Game.min += 1; } if (Game.min > 23) { Game.min = 0; } Game.begin(); }, color: function () { if (Game.hang[3].children[0].style.background == 'black') { Game.font[0].style.color = 'white'; } else { Game.font[0].style.color = 'transparent'; } if (Game.hang[3].children[1].style.background == 'black') { Game.font[1].style.color = 'white'; } else { Game.font[1].style.color = 'transparent'; } if (Game.hang[3].children[2].style.background == 'black') { Game.font[2].style.color = 'white'; } else { Game.font[2].style.color = 'transparent'; } }, adds: function () { Game.tab.insertRow(0); for (var i = 0; i < 3; i++) { Game.hang[0].insertCell(); } Game.hang[0].children[Math.ceil(Math.random() * 3) - 1].style.background = 'black'; }, speedup: function () { if (Game.btn == 0 || Game.btn % 150 != 0) { Game.tab.style.bottom = -Game.btn - 5 + 'px'; Game.btn += 5; setTimeout(Game.speedup, 1); } else { clearTimeout(Game.speedup); Game.btn += 5; } }, speed: function () { Game.adds(); Game.speedup(); }, scores: function () { Game.score += 1; Game.sco.innerHTML = Game.score; }, over: function () { alert('游戏结束,得分:' + Game.score + ';用时' + Game.time.innerHTML); clearInterval(Game.int); Game.mis = 0; Game.sec = 0; Game.min = 0; Game.score = 0; Game.sco.innerHTML = Game.score; Game.time.innerHTML = (Game.min < 10 ? "0" + Game.min : Game.min) + ":" + (Game.sec < 10 ? "0" + Game.sec : Game.sec) + ":" + (Game.mis < 10 ? "0" + Game.mis : Game.mis); Game.bool = true; }, key: function () { onkeydown = function (event) { if (Game.bool == true && (event.key == 'j' || event.key == 'k' || event.key == 'l')) { Game.int = setInterval(Game.times, 10); Game.bool = false; } switch (event.key) { case 'j': if (Game.hang[3].children[0].style.background == 'black') { Game.speed(); Game.scores(); } else { Game.over(); } break; case 'k': if (Game.hang[3].children[1].style.background == 'black') { Game.speed(); Game.scores(); } else { Game.over(); } break; case 'l': if (Game.hang[3].children[2].style.background == 'black') { Game.speed(); Game.scores(); } else { Game.over(); } break; } Game.color(); } } } //获取列--------------------------------------------- Game.hang[0].children[Math.ceil(Math.random() * 3) - 1].style.background = 'black'; Game.hang[1].children[Math.ceil(Math.random() * 3) - 1].style.background = 'black'; Game.hang[2].children[Math.ceil(Math.random() * 3) - 1].style.background = 'black'; Game.hang[3].children[Math.ceil(Math.random() * 3) - 1].style.background = 'black'; //-------------------------------------------------- //键盘按下事件---------------------------------------- Game.color(); Game.key(); //--------------------------------------------------- </script> </html>
至此这个小游戏也就完成了啦,希望对你有所帮助,再见~
总结
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