JavaScript实现打砖块游戏

时间：2021-05-26

本文实例为大家分享了JavaScript实现打砖块游戏的具体代码，供大家参考，具体内容如下

html+css部分

<!DOCTYPE html><html> <head> <meta charset="UTF-8"> <title>打砖块</title> <link rel="stylesheet" type="text/css" href="css/break.css" rel="external nofollow" /> <script type="text/javascript" src="js/break.js"></script> <style type="text/css"> *{ padding: 0; margin: 0; } .content{ position: relative; width: 800px; height: 600px; background-color: #999; margin: 0 auto; overflow: hidden; } .game{ position: relative; width: 550px; height: 500px; background-color: pink; margin: 20px auto 0; } .brick{ position: absolute; width: 50px; height: 20px; background-color: blueviolet; } .flap{ position: absolute; width: 120px; height: 30px; bottom: 0; left: 0; background-color: blue; } .ball{ position: absolute; width: 30px; height: 30px; bottom: 30px; left: 0; border-radius: 50%; background-color: greenyellow; } .btn{ position: absolute; width: 550px; height: 50px; bottom: 0; left: 125px; } .btn button{ width: 120px; height: 40px; } #score{ position: absolute; width: 80px; height: 30px; right: 0; top: 10%; background-color: #fff; } </style> </head> <body> <div class="content"> <div class="game"> <!--<div class="brick"></div>--> <!--<div class="flap"></div> <div class="ball"></div>--> </div> <div class="btn"> <button id="start">开始</button> <button id="reset">重置</button> </div> <div id="score"> </div> </div> </body></html>

js部分

window.onload = init; function init(){ var gameArea = document.getElementsByClassName("game")[0]; var rows = 5; var cols = 11; var b_width = 50; var b_height = 20; var bricks = []; var speedX = 5; var speedY = -5; var interId = null; var lf = 0; var tp = 0; var flap var ball; var n = 0; var st = document.getElementById("start"); var rt = document.getElementById("reset"); var score = document.getElementById("score"); score.innerHTML = "得分:" + n; renderDom(); bindDom(); function renderDom(){ getBrick(); //得到五彩砖块 function getBrick(){ for (var i = 0; i < rows; i++) { var tp = i * b_height; var brick = null; for (var j = 0; j < cols; j++) { var lf = j * b_width; brick = document.createElement("div"); brick.className = "brick"; brick.setAttribute("style","top:" + tp + "px;left:" + lf + "px;"); brick.style.backgroundColor = getColor(); bricks.push(brick); gameArea.appendChild(brick); } } } //添加挡板 var flap = document.createElement("div"); flap.className = "flap"; gameArea.appendChild(flap); //添加挡板小球 var ball = document.createElement("div"); ball.className = "ball"; gameArea.appendChild(ball); } function bindDom(){ flap = document.getElementsByClassName("flap")[0]; window.onkeydown = function(e){ var ev = e || window.event; var lf = null; if (e.keyCode == 37) { //左键往左走 lf = flap.offsetLeft - 10; if (lf < 0) { lf = 0; } flap.style.left = lf + "px"; }else if (e.keyCode == 39) { //右键往右走 lf = flap.offsetLeft + 10; if (lf >= gameArea.offsetWidth - flap.offsetWidth) { lf = gameArea.offsetWidth - flap.offsetWidth } flap.style.left = lf + "px"; } } st.onclick = function(){ ballMove(); st.onclick = null; } rt.onclick = function(){ window.location.reload(); } } //得到砖块的随即颜色 function getColor(){ var r = Math.floor(Math.random()*256); var g = Math.floor(Math.random()*256); var b = Math.floor(Math.random()*256); return "rgb(" + r + "," + g + "," + b +")"; } //实现小球上下左右来回运动 function ballMove(){ ball = document.getElementsByClassName("ball")[0]; interId = setInterval(function(){ lf = ball.offsetLeft + speedX; tp = ball.offsetTop + speedY; //实现砖块消失的效果 for (var i = 0; i < bricks.length; i++) { var bk = bricks[i]; if ((lf + ball.offsetWidth/2) >= bk.offsetLeft && (lf + ball.offsetWidth/2) <= (bk.offsetLeft + bk.offsetWidth) && (bk.offsetTop + bk.offsetHeight) >= ball.offsetTop ) { bk.style.display = "none"; speedY = 5; n++; score.innerHTML = "得分:"+n; } } if (lf < 0) { speedX = -speedX; } if (lf >= (gameArea.offsetWidth - ball.offsetWidth)){ speedX = -speedX; } if (tp <= 0) { speedY = 5; }else if((ball.offsetTop + ball.offsetHeight) >= flap.offsetTop && (ball.offsetLeft + ball.offsetWidth/2) >= flap.offsetLeft && (ball.offsetLeft + ball.offsetWidth/2) <= (flap.offsetLeft + flap.offsetWidth) ){ speedY = -5; }else if(ball.offsetTop >= flap.offsetTop){ gameOver(); } ball.style.left = lf + 'px'; ball.style.top = tp + "px"; },20) } //判断游戏是否结束 function gameOver(){ alert("game over" + "\n" + "您的得分是" + score.innerHTML); clearInterval(interId); } }

更多关于Js游戏的精彩文章，请查看专题： 《JavaScript经典游戏 玩不停》

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