• JavaScript小游戏按下按钮移动方块


    <!DOCTYPE html>
    <html lang="zh">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <meta http-equiv="X-UA-Compatible" content="ie=edge">
        <title></title>
        <style>
            /* 游戏块背景样式 */
            canvas{
                border: 1px solid #d3d3d3;
                background-color: #f1f1f1;
            }
        </style>
    </head>
    <!-- 开始游戏事件 -->
    <body onload="startGame()">
        
        <script type="text/javascript">
            // 红色的砖块
            var myGamePiece;
            //我的障碍物
            var myObstacles=[];
            //游戏得分
            var myScore;
            
            // 点击开始游戏
            function startGame(){
                // 初始化对象
                myGamePiece = new component(30,30,"red",10,120);
                // 调用属性赋值
                myGamePiece.gravity=0.05;
                // 初始化对象
                myScore=new component("30px","Consolas","black",280,40,"text");
                // 调用方法
                myGameArea.start();
            }
            
            
            // 定义一个游戏面积,字面量对象
            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);
                }
            }
            
            
            
            
            
            // 定义一个组件,构造函数对象
            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;
                // 重力
                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();
                }
                // 红色按钮
                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;
                    
                }
                
            }
            
            
            // 类似更新游戏里面得上下得柱子
    function updateGameArea(){
        var x,height,gap,minHeight,maxHeight,minGap,maxGap;
        for(i=0;i<myObstacles.length;i++){
            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++){
            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;
    }
    
    // 重力
    function accelerate(n){
        myGamePiece.gravity=n;
    }
    
    
    </script>
    <br>
    <br>
    <button onmousedown="accelerate(-0.2)" onmouseup="accelerate(0.05)">ACCELRATE</button>
    
    </body>
    </html>
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  • 原文地址:https://www.cnblogs.com/hechunfeng/p/15622507.html
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