jsp网页实现贪吃蛇小游戏

关于JSP网页实现贪吃蛇小游戏，我们可以分为以下几个步骤：

1. 设计页面

首先，我们要设计一个页面来展示贪吃蛇游戏。可以在页面中设置游戏区域、得分区域等。可以使用HTML和CSS来完成这个页面的设计。

以下是一个简单的示例代码：

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>贪吃蛇小游戏</title>
  <style>
    /* 游戏区域样式 */
    #canvas {
      width: 480px;
      height: 480px;
      border: 1px solid #ccc;
      margin: 0 auto;
    }
    /* 得分区域样式 */
    #score {
      width: 480px;
      margin: 20px auto;
      text-align: center;
      font-size: 24px;
    }
  </style>
</head>
<body>
  <div id="canvas"></div>
  <div id="score">得分：<span id="scoreNum">0</span></div>
</body>
</html>

2. 编写JavaScript代码

其次，我们需要编写JavaScript代码来实现贪吃蛇游戏的逻辑。可以使用Canvas API来绘制游戏区域。需要监测玩家的按键事件来改变贪吃蛇的方向，以及模拟贪吃蛇的行动逻辑和碰撞检测等。

以下是一个简单的示例代码：

// 初始化游戏区域
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
var blockSize = 20;
var widthInBlocks = canvas.width / blockSize;
var heightInBlocks = canvas.height / blockSize;

// 绘制方块
function drawBlock(ctx, position) {
  var x = position[0] * blockSize;
  var y = position[1] * blockSize;
  ctx.fillRect(x, y, blockSize, blockSize);
}

// 绘制贪吃蛇
function Snake() {
  this.segments = [
    [7, 5],
    [6, 5],
    [5, 5]
  ];
  this.direction = "right";
  // 贪吃蛇移动
  this.move = function() {
    var head = this.segments[0].slice();
    switch (this.direction) {
      case "right":
        head[0] += 1;
        break;
      case "down":
        head[1] += 1;
        break;
    }
    this.segments.unshift(head);
    this.segments.pop();
  };
  // 改变方向
  this.changeDirection = function(newDirection) {
    switch (newDirection) {
      case "left":
        this.direction = "left";
        break;
      case "up":
        this.direction = "up";
        break;
    }
  };
  // 判断碰撞
  this.checkCollision = function() {
    var wallCollision = false;
    var selfCollision = false;
    var head = this.segments[0];
    var rest = this.segments.slice(1);
    var headX = head[0];
    var headY = head[1];
    var minX = 0;
    var minY = 0;
    var maxX = widthInBlocks - 1;
    var maxY = heightInBlocks - 1;
    var outsideHorizontalBounds = headX < minX || headX > maxX;
    var outsideVerticalBounds = headY < minY || headY > maxY;
    if (outsideHorizontalBounds || outsideVerticalBounds) {
      wallCollision = true;
    }
    for (var i = 0; i < rest.length; i++) {
      if (headX === rest[i][0] && headY === rest[i][1]) {
        selfCollision = true;
      }
    }
    return wallCollision || selfCollision;
  };
  // 判断是否吃到食物
  this.checkFood = function(foodPosition) {
    var head = this.segments[0];
    if (head[0] === foodPosition[0] && head[1] === foodPosition[1]) {
      return true;
    } else {
      return false;
    }
  };
}

// 绘制食物
function Food() {
  this.position = [10, 10];
  // 随机食物位置
  this.randomize = function() {
    var x = Math.floor(Math.random() * (widthInBlocks - 2)) + 1;
    var y = Math.floor(Math.random() * (heightInBlocks - 2)) + 1;
    this.position = [x, y];
  };
  // 绘制食物
  this.draw = function() {
    drawBlock(ctx, this.position);
  };
}

// 键盘事件
document.addEventListener('keydown', function(event) {
  var keyCode = event.keyCode;
  var newDirection;
  switch (keyCode) {
    case 37:
      newDirection = "left";
      break;
    case 38:
      newDirection = "up";
      break;
    case 39:
      newDirection = "right";
      break;
    case 40:
      newDirection = "down";
      break;
  }
  snake.changeDirection(newDirection);
});

// 游戏循环
var snake = new Snake();
var food = new Food();
function gameLoop() {
  ctx.clearRect(0, 0, canvas.width, canvas.height);
  snake.move();
  if (snake.checkCollision()) {
    alert("游戏结束！");
    snake = new Snake();
  }
  if (snake.checkFood(food.position)) {
    snake.segments.push(food.position);
    food.randomize();
    var score = document.getElementById("scoreNum");
    score.innerText = parseInt(score.innerText) + 10;
  }
  snake.segments.forEach(function(segment) {
    drawBlock(ctx, segment);
  });
  food.draw();
  setTimeout(gameLoop, 100);
}
gameLoop();

3. 将JavaScript代码嵌入JSP页面

最后，我们将JavaScript代码嵌入到JSP页面中，使页面可以动态生成和渲染。具体来说，可以将JavaScript代码放在<script>标签中，并通过JSP的EL表达式来动态生成和渲染页面。

以下是一个完整的示例代码：

<%--
  贪吃蛇小游戏页面
--%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>贪吃蛇小游戏</title>
  <style>
    /* 游戏区域样式 */
    #canvas {
      width: 480px;
      height: 480px;
      border: 1px solid #ccc;
      margin: 0 auto;
    }
    /* 得分区域样式 */
    #score {
      width: 480px;
      margin: 20px auto;
      text-align: center;
      font-size: 24px;
    }
  </style>
</head>
<body>
  <div id="canvas"></div>
  <div id="score">得分：<span id="scoreNum">0</span></div>

  <script>
    // 初始化游戏区域
    var canvas = document.getElementById('canvas');
    var ctx = canvas.getContext('2d');
    var blockSize = 20;
    var widthInBlocks = canvas.width / blockSize;
    var heightInBlocks = canvas.height / blockSize;

    // 绘制方块
    function drawBlock(ctx, position) {
      var x = position[0] * blockSize;
      var y = position[1] * blockSize;
      ctx.fillRect(x, y, blockSize, blockSize);
    }

    // 绘制贪吃蛇
    function Snake() {
      this.segments = [
        [7, 5],
        [6, 5],
        [5, 5]
      ];
      this.direction = "right";
      // 贪吃蛇移动
      this.move = function() {
        var head = this.segments[0].slice();
        switch (this.direction) {
          case "right":
            head[0] += 1;
            break;
          case "down":
            head[1] += 1;
            break;
        }
        this.segments.unshift(head);
        this.segments.pop();
      };
      // 改变方向
      this.changeDirection = function(newDirection) {
        switch (newDirection) {
          case "left":
            this.direction = "left";
            break;
          case "up":
            this.direction = "up";
            break;
        }
      };
      // 判断碰撞
      this.checkCollision = function() {
        var wallCollision = false;
        var selfCollision = false;
        var head = this.segments[0];
        var rest = this.segments.slice(1);
        var headX = head[0];
        var headY = head[1];
        var minX = 0;
        var minY = 0;
        var maxX = widthInBlocks - 1;
        var maxY = heightInBlocks - 1;
        var outsideHorizontalBounds = headX < minX || headX > maxX;
        var outsideVerticalBounds = headY < minY || headY > maxY;
        if (outsideHorizontalBounds || outsideVerticalBounds) {
          wallCollision = true;
        }
        for (var i = 0; i < rest.length; i++) {
          if (headX === rest[i][0] && headY === rest[i][1]) {
            selfCollision = true;
          }
        }
        return wallCollision || selfCollision;
      };
      // 判断是否吃到食物
      this.checkFood = function(foodPosition) {
        var head = this.segments[0];
        if (head[0] === foodPosition[0] && head[1] === foodPosition[1]) {
          return true;
        } else {
          return false;
        }
      };
    }

    // 绘制食物
    function Food() {
      this.position = [10, 10];
      // 随机食物位置
      this.randomize = function() {
        var x = Math.floor(Math.random() * (widthInBlocks - 2)) + 1;
        var y = Math.floor(Math.random() * (heightInBlocks - 2)) + 1;
        this.position = [x, y];
      };
      // 绘制食物
      this.draw = function() {
        drawBlock(ctx, this.position);
      };
    }

    // 键盘事件
    document.addEventListener('keydown', function(event) {
      var keyCode = event.keyCode;
      var newDirection;
      switch (keyCode) {
        case 37:
          newDirection = "left";
          break;
        case 38:
          newDirection = "up";
          break;
        case 39:
          newDirection = "right";
          break;
        case 40:
          newDirection = "down";
          break;
      }
      snake.changeDirection(newDirection);
    });

    // 游戏循环
    var snake = new Snake();
    var food = new Food();
    function gameLoop() {
      ctx.clearRect(0, 0, canvas.width, canvas.height);
      snake.move();
      if (snake.checkCollision()) {
        alert("游戏结束！");
        snake = new Snake();
      }
      if (snake.checkFood(food.position)) {
        snake.segments.push(food.position);
        food.randomize();
        var score = document.getElementById("scoreNum");
        score.innerText = parseInt(score.innerText) + 10;
      }
      snake.segments.forEach(function(segment) {
        drawBlock(ctx, segment);
      });
      food.draw();
      setTimeout(gameLoop, 100);
    }
    gameLoop();
  </script>
</body>
</html>

这样，我们就完成了JSP网页实现贪吃蛇小游戏的完整攻略。

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jsp网页实现贪吃蛇小游戏

1. 设计页面

2. 编写JavaScript代码

3. 将JavaScript代码嵌入JSP页面

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