我正在尝试使用 div 创建一个游戏来创建背景，以便对象有一个可以移动的设定区域。对我来说，第一步是让墙在屏幕上向“汽车”对象移动。我试图通过识别它的 x 并改变它来做到这一点，但它不起作用。我认为这可能与我没有使用 Canvas 有关，但除非绝对需要，否则我宁愿不使用 Canvas 。这是我的代码:
<!DOCTYPE html>
<html>
<head>
<style>
#grass {
background-color: green;
height: 100px;
width: 750px;
}
#road {
background-color: grey;
height: 200px;
width: 750px;
}
#ai {
position: absolute;
background-color: red;
height: 50px;
width: 100px;
margin-top: 75px;
}
#obstacle {
background-color: blue;
height: 100px;
width: 50px;
float: right;
}
.sensor {
position: relative;
background-color: white;
width: 50px;
height: 50px;
text-align: center;
opacity: 0.5;
}
#sensor1 {
top: 50px;
left: 50px;
}
#sensor2 {
top: -50px;
left: 100px;
width: 300px;;
}
#sensor3 {
top: -150px;
left: 50px;
}
</style>
</head>
<body>
<div id="scene">
<div id="grass">
</div>
<div id="road">
<div id="ai">
<div id="sensor1" class="sensor">1</div>
<div id="sensor2" class="sensor">2</div>
<div id="sensor3" class="sensor">3</div>
</div>
<div id="obstacle">
</div>
</div>
<div id="grass">
</div>
</div>
<br />
<br />
<button onclick="moveWall()">Run</button>
<script>
function moveWall(x) {
getWallx = document.getElementById("obstacle").x;
this.speedX = 0;
if(getWallx <= 0) {
document.getElementById("obstacle").style.left = null;
document.getElementById("obstacle").style.right = "0px";
} else {
getWallx -= this.speedX
document.getElementById("obstacle").style.left = getWallx+'px';
}
}
</script>
</body>
</html>
最佳答案
这是另一个与您的问题类似的问题。 Moving Div Box using javascript ，如果你必须在游戏中使用 div，这应该是一个很好的起点
但我建议使用 Canvas ，因为它有更好的移动 API 等。
尝试从片段中进行此操作。 w3school
var myGamePiece;
var myObstacles = [];
var myScore;
function startGame() {
myGamePiece = new component(30, 30, "red", 10, 120);
myGamePiece.gravity = 0.05;
myScore = new component("30px", "Consolas", "black", 280, 40, "text");
myGameArea.start();
}
var myGameArea = {
canvas : document.createElement("canvas"),
start : function() {
this.canvas.width = 480;
this.canvas.height = 270;
this.context = this.canvas.getContext("2d");
document.body.insertBefore(this.canvas, document.body.childNodes[0]);
this.frameNo = 0;
this.interval = setInterval(updateGameArea, 20);
},
clear : function() {
this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
}
}
function component(width, height, color, x, y, type) {
this.type = type;
this.score = 0;
this.width = width;
this.height = height;
this.speedX = 0;
this.speedY = 0;
this.x = x;
this.y = y;
this.gravity = 0;
this.gravitySpeed = 0;
this.update = function() {
ctx = myGameArea.context;
if (this.type == "text") {
ctx.font = this.width + " " + this.height;
ctx.fillStyle = color;
ctx.fillText(this.text, this.x, this.y);
} else {
ctx.fillStyle = color;
ctx.fillRect(this.x, this.y, this.width, this.height);
}
}
this.newPos = function() {
this.gravitySpeed += this.gravity;
this.x += this.speedX;
this.y += this.speedY + this.gravitySpeed;
this.hitBottom();
}
this.hitBottom = function() {
var rockbottom = myGameArea.canvas.height - this.height;
if (this.y > rockbottom) {
this.y = rockbottom;
this.gravitySpeed = 0;
}
}
this.crashWith = function(otherobj) {
var myleft = this.x;
var myright = this.x + (this.width);
var mytop = this.y;
var mybottom = this.y + (this.height);
var otherleft = otherobj.x;
var otherright = otherobj.x + (otherobj.width);
var othertop = otherobj.y;
var otherbottom = otherobj.y + (otherobj.height);
var crash = true;
if ((mybottom < othertop) || (mytop > otherbottom) || (myright < otherleft) || (myleft > otherright)) {
crash = false;
}
return crash;
}
}
function updateGameArea() {
var x, height, gap, minHeight, maxHeight, minGap, maxGap;
for (i = 0; i < myObstacles.length; i += 1) {
if (myGamePiece.crashWith(myObstacles[i])) {
return;
}
}
myGameArea.clear();
myGameArea.frameNo += 1;
if (myGameArea.frameNo == 1 || everyinterval(150)) {
x = myGameArea.canvas.width;
minHeight = 20;
maxHeight = 200;
height = Math.floor(Math.random()*(maxHeight-minHeight+1)+minHeight);
minGap = 50;
maxGap = 200;
gap = Math.floor(Math.random()*(maxGap-minGap+1)+minGap);
myObstacles.push(new component(10, height, "green", x, 0));
myObstacles.push(new component(10, x - height - gap, "green", x, height + gap));
}
for (i = 0; i < myObstacles.length; i += 1) {
myObstacles[i].x += -1;
myObstacles[i].update();
}
myScore.text="SCORE: " + myGameArea.frameNo;
myScore.update();
myGamePiece.newPos();
myGamePiece.update();
}
function everyinterval(n) {
if ((myGameArea.frameNo / n) % 1 == 0) {return true;}
return false;
}
function accelerate(n) {
myGamePiece.gravity = n;
}
startGame()<button onmousedown="accelerate(-0.2)" onmouseup="accelerate(0.05)">ACCELERATE</button>
<p>Use the ACCELERATE button to stay in the air</p>
<p>How long can you stay alive?</p>关于javascript - 如何使用 javascript 在 div 上移动对象？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/60422033/