javascript制作坦克大战全纪录（1）

 
 
 
    
    
    
    
    
    
    
    
 
 
 
    
    
    
 
 

 // 顶级对象
 TankObject = function () {
     this.XPosition = 0; // 对象在地图（13*13）中的X的位置
     this.YPosition = 0;
     this.UI = null; // dom元素
 }
 // 更改UI静态方法
 TankObject.prototype.UpdateUI = function (battlFiled) { }
 // 设置位置，参数是这样：1*40,6*40
 TankObject.prototype.SetPosition = function (leftPosition, topPosition) {
     // 在地图的位置 Math.round四舍五入   
     this.XPosition = Math.round(leftPosition / 40);
     this.YPosition = Math.round(topPosition / 40);
     // 设置在窗体上的位置
     if (this.UI != null && this.UI.style != null) {
         this.UI.style.left = leftPosition + "px";
         this.UI.style.top = topPosition + "px";
     }
 }

// 坦克移动的四个方向
var EnumDirection = {
    Up: "0",
    Right: "1",
    Down: "2",
    Left: "3"
};
// 通用方法对象
var UtilityClass = {
    // 创建dom元素到parentNode中，可指定id，className
    CreateE: function (type, id, className, parentNode) {
        var J = document.createElement(type);
        if (id) { J.id = id };
        if (className) { J.className = className };
        return parentNode.appendChild(J);
    },  // 移除元素
    RemoveE: function (obj, parentNode) {
        parentNode.removeChild(obj);
    },
    GetFunctionName: function (context, argumentCallee) {
        for (var i in context) {
            if (context[i] == argumentCallee) { return i };
        }
        return "";
    },  // 绑定事件，返回func方法，this为传入的obj
    BindFunction: function (obj,func) {
        return function () {
            func.apply(obj, arguments);
        };
    }
};

 // 移动对象，继承自顶层对象
 Mover = function () {
     this.Direction = EnumDirection.Up;
     this.Speed = 1;
 }
 Mover.prototype = new TankObject();
 Mover.prototype.Move = function () {
     if (this.lock) {
         return;/* 停用或者尚在步进中,操作无效 */
     }
     // 根据方向设置坦克的背景图片
     this.UI.style.backgroundPosition = "0 -" + this.Direction * 40 + "px";
     // 如果方向是上和下，vp就是top；如果方向是上和左，val就是-1
     var vp = ["top", "left"][((this.Direction == EnumDirection.Up) || (this.Direction == EnumDirection.Down)) &＃63; 0 : 1];
     var val = ((this.Direction == EnumDirection.Up) || (this.Direction == EnumDirection.Left)) &＃63; -1 : 1;
     this.lock = true;/* 加锁 */
     // 把当前对象保存到This
     var This = this;
     // 记录对象移动起始位置
     var startmoveP = parseInt(This.UI.style[vp]);
     var xp = This.XPosition, yp = This.YPosition;
     var subMove = setInterval(function () {
         // 开始移动，每次移动5px
         This.UI.style[vp] = parseInt(This.UI.style[vp]) + 5 * val + "px";
         // 每次移动一个单元格 40px
         if (Math.abs((parseInt(This.UI.style[vp]) - startmoveP)) >= 40) {
             clearInterval(subMove);
             This.lock = false;/* 解锁,允许再次步进 */
             // 记录对象移动后在表格中的位置
             This.XPosition = Math.round(This.UI.offsetLeft / 40);
             This.YPosition = Math.round(This.UI.offsetTop / 40);
         }
     }, 80 - this.Speed * 10);
 }

//tank对象 继承自Mover
Tank=function(){}
Tank.prototype = new Mover();

// 创建玩家坦克,继承自tank对象
SelfTank = function () {
    this.UI = UtilityClass.CreateE("div", "", "itank", document.getElementById("divMap"));
    this.MovingState = false;
    this.Speed = 4;
}
SelfTank.prototype = new Tank();
// 设置坦克的位置
SelfTank.prototype.UpdateUI = function () {
    this.UI.className = "itank";
    // 顶级对象方法，设置坦克的位置
    this.SetPosition(this.XPosition * 40, this.YPosition * 40);
}

 // 游戏载入对象 整个游戏的核心对象
 GameLoader = function () {
     this.mapCOntainer= document.getElementById("divMap");  // 存放游戏地图的div
     this._selfTank = null;  // 玩家坦克
     this._gameListener = null; // 游戏主循环计时器id
 }
 GameLoader.prototype = {
     Begin: function () {
         // 初始化玩家坦克
         var selfT = new SelfTank();
         selfT.XPosition = 4;
         selfT.YPosition = 12;
         selfT.UpdateUI();
         this._selfTank = selfT;
         // 添加按键事件
         var warpper = UtilityClass.BindFunction(this, this.OnKeyDown);
         window.Onkeydown= document.body.Onkeydown= warpper;
         warpper = UtilityClass.BindFunction(this, this.OnKeyUp);
         window.Onkeyup= document.body.Onkeyup= warpper;
         // 游戏主循环
         warpper = UtilityClass.BindFunction(this, this.Run);
         /*长定时器监听控制键*/
         this._gameListener = setInterval(warpper, 20);
     }
     // 键盘按下玩家坦克开始移动
     , OnKeyDown: function (e) {
         switch ((window.event || e).keyCode) {
             case 37:
                 this._selfTank.Direction = EnumDirection.Left;
                 this._selfTank.MovingState = true;
                 break;        //左
             case 38:
                 this._selfTank.Direction = EnumDirection.Up;
                 this._selfTank.MovingState = true;
                 break;        //上
             case 39:
                 this._selfTank.Direction = EnumDirection.Right;
                 this._selfTank.MovingState = true;
                 break;        //右
             case 40:
                 this._selfTank.Direction = EnumDirection.Down;
                 this._selfTank.MovingState = true;
                 break;        //下
         }
     }
     // 按键弹起停止移动
     , OnKeyUp: function (e) {
         switch ((window.event || e).keyCode) {
             case 37:
             case 38:
             case 39:
             case 40:
                 this._selfTank.MovingState = false;
                 break;
         }
     }
     /*游戏主循环运行函数，游戏的心脏，枢纽*/
     , Run: function () {
         if (this._selfTank.MovingState) {
             this._selfTank.Move();
         }
     }
 };