js实现带积分弹球小游戏

时间：2021-05-26

本文实例为大家分享了js实现带积分的弹球小游戏的具体代码，供大家参考，具体内容如下

注：如果小球与底部方块的角碰撞，积分可能有些许bug

<style> #box { width: 400px; height: 400px; border: 1px solid #000000; margin: 50px auto; position: relative; } #ball { height: 60px; width: 60px; border-radius: 50%; background-color: red; position: absolute; left: 0; top: 0; } #block { width: 100px; height: 20px; position: absolute; left: 150px; bottom: 0; background-color: black; } #count { color: #ff0000; font-size: 18px; position: absolute; width: 20px; height: 20px; left: -20px; top: 0; }</style><body> <div id="box"> <div id="count">0</div> <div id="ball"></div> <div id="block"></div> </div></body><script> var oBox = document.querySelector('#box'); var oBall = document.querySelector('#ball'); var oBlock = document.querySelector('#block'); var oCount = document.querySelector('#count'); var speedBlock = 5; var speedX = 5; var speedY = 4; var maxLeft = oBox.clientWidth - oBall.offsetWidth; var maxTop = oBox.clientHeight - oBall.offsetHeight; var max = oBox.clientWidth - oBlock.offsetWidth; setInterval(function () { var left = oBall.offsetLeft; var top = oBall.offsetTop; left += speedX; top += speedY; if (left < 0 || left > maxLeft) { speedX = -speedX; } if (top < 0) { speedY *= -1; } var r = oBall.offsetWidth / 2; if (left >= oBlock.offsetLeft - r && // 左边线碰撞条件 left <= oBlock.offsetLeft - r + oBlock.offsetWidth && // 右边线碰撞条件 top >= maxTop - oBlock.offsetHeight // 下边线碰撞条件 ) { // console.log('撞上了'); speedY = -Math.abs(speedY); // speedY *= -1; oCount.innerHTML = oCount.innerHTML * 1 + 1; } if (top > maxTop) { left = 0; top = 0; } oBall.style.left = left + 'px'; oBall.style.top = top + 'px'; }, 50); document.onkeydown = function (e) { var ev = event || e; var keyCode = ev.keyCode || ev.which; var left = oBlock.offsetLeft; if (keyCode === 37) { left -= speedBlock; } if (keyCode === 39) { left += speedBlock; } if (left <= 0) { left = 0 } if (left >= max) { left = max; } oBlock.style.left = left + 'px'; }</script>

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