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百度前端技术学院task34源码——会指令的小块2

任务描述

增加新的指令如下：
- TRA LEF：向屏幕的左侧移动一格，方向不变
- TRA TOP：向屏幕的上面移动一格，方向不变
- TRA RIG：向屏幕的右侧移动一格，方向不变
- TRA BOT：向屏幕的下面移动一格，方向不变
- MOV LEF：方向转向屏幕左侧，并向屏幕的左侧移动一格
- MOV TOP：方向转向屏幕上面，向屏幕的上面移动一格
- MOV RIG：方向转向屏幕右侧，向屏幕的右侧移动一格
- MOV BOT：方向转向屏幕下面，向屏幕的下面移动一格

分析：

　　只是在1的基础上添加了相应的命令，其他并没有太多改变。因此，只要在1的基础上添加相应的代码就好了。

注意点：写好之后，想一想，代码能不能再次精简，有没有多余的地方。

体验网址：http://1.huanssky.applinzi.com/ablum/ife/task34.html；

源代码：

<!doctype html>
<html>
  <head>
    <title>听指令的小方块  by huansky</title>
    <meta charset="utf-8"/>
    <style type="text/css">
    h1 {
      font:400 16px/1 "Microsoft YaHei",KaiTi_GB2312,SimSun;
      text-align: center;
    }
    #main{
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translateY(-50%) translateX(-50%); 

    }
    #container{
      position: relative;
      border: 1px solid #ddd;
      width: 500px;
      height: 500px;
    }
    span{
      width: 50px;
      height: 50px;
      border: 1px solid #ddd;
      float: left;
      -moz-box-sizing: border-box;  /*Firefox3.5+*/
      -webkit-box-sizing: border-box; /*Safari3.2+*/
      -o-box-sizing: border-box; /*Opera9.6*/
      -ms-box-sizing: border-box; /*IE8*/
      box-sizing: border-box; /*W3C标准(IE9+，Safari5.1+,Chrome10.0+,Opera10.6+都符合box-sizing的w3c标准语法)*/
    }
    #box{
      position: absolute;
      width: 50px;
      height: 50px;
      -moz-box-sizing: border-box;  /*Firefox3.5+*/
      -webkit-box-sizing: border-box; /*Safari3.2+*/
      -o-box-sizing: border-box; /*Opera9.6*/
      -ms-box-sizing: border-box; /*IE8*/
      box-sizing: border-box; /*W3C标准(IE9+，Safari5.1+,Chrome10.0+,Opera10.6+都符合box-sizing的w3c标准语法)*/ 
    }
    #box .up{
      background: blue;
      height: 10px;
      width: 100%;
      position: relative;
      border: none;
    }
    #box .down{
      background: red;
      height: 40px;
      width: 100%;
      position: relative;
      border: none;
    }
    p{
      color: red;
      text-align: center;
    }
    input{
      margin: 6px;
    }
  </style>
</head>
<body>
  <div id="main">
    <h1>听指令的小方块 by huansky</h1>
    <p id="message"></p>
    <div id="container">
      <span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span>
      <span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span>
      <span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span>
      <span></span><span></span><span></span><span></span>
      <div id="box"><span class="up"></span><span class="down"></span></div>
      <span></span><span></span><span></span><span></span><span></span><span></span>
      <span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span>
      <span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span>
      <span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span>
      <span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span>
      <span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span>
      <span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span>
    </div>
    <br>
    <label><input type="text" id="invalue">请输入命令：go, left, right, back; 不区分大小写</label>
    <div id="btndir"><input type="button" id="excute" value="执行">
      <input id="go" type="button" value="GO">
      <input id="tunLef" type="button" value="Turn LEFT">
      <input id="tunRig" type="button" value="Turn RIGHT">
      <input id="tunBac" type="button" value="Turn BACK">
      <br>
      <input id="traDown" type="button" value="traDown">
      <input id="traLef" type="button" value="traLeft">
      <input id="traRig" type="button" value="traRight">
      <input id="traTop" type="button" value="traTop">
    </div>
  </div>
</body>
<script type="text/javascript">
    
    //将所有的变量都放在moveBox里面。
    var moveBox={
        box:getid("box") ,  //获取小块的id
        invalue:getid("invalue") ,  //输入框的id
        btndir:getid("btndir"),     //获取按钮容器的id
        left:100,     //左边距          
        topl:100,     //上边距
        direction:1,  //(0代表左，1代表up，2代表右，3代表down)
        current:0,    //当前角度
        message:getid("message"),    //获取信息id
        flag:0
    }

    //获取id方法
    function getid(id){
      return document.getElementById(id);
    }

    //根据指令进行相应的旋转
    function rotate(dir){

        switch(dir){
          case "left":
            moveBox.current = (moveBox.current-90)%360;  //计算当前需要转的角度
            draw();
            moveBox.direction--;  //改变方向
            break;

          case "right":
            moveBox.current = (moveBox.current+90)%360;  //计算当前需要转的角度
            draw();
            moveBox.direction++;  //改变方向
            break;

          case "back":
          moveBox.current = (moveBox.current+180)%360;  //计算当前需要转的角度
            draw();
            moveBox.direction++;
            moveBox.direction++;  //改变方向
            break;
        }
  }


    function go(dir){
        //修正方向，使其在[0,4）之间
        moveBox.direction=moveBox.direction % 4+(moveBox.direction % 4 < 0 ? 4 : 0);
          
        if(moveBox.left>0 && (moveBox.direction==0 && dir==null || dir=="traLeft")){
          moveBox.left=moveBox.left-50;
          draw();
        }else if( moveBox.topl>0 && (moveBox.direction==1 && dir==null || dir=="traTop")){
          moveBox.topl=moveBox.topl-50;
          draw();
        }else if( moveBox.left<450 && (moveBox.direction==2 && dir==null || dir=="traRight")){
          moveBox.left=moveBox.left+50;
          draw();
        }else if(moveBox.topl<450 && (moveBox.direction==3 && dir==null || dir=="traDown")){
          moveBox.topl=moveBox.topl+50;
          draw();
        } else {
          moveBox.message.innerHTML="移动不能超出格子空间";
        }
    }


    //事件绑定函数
    function on(element,eventName,listener){

        if (element.addEventListener){
            element.addEventListener(eventName,listener,false);
        }
        else if (element.attachEvent){
            element.attachEvent('on'+eventName,listener);
        }
        else
            element['on'+eventName]=listener;
    }

    //进行事件绑定
    on(btndir,"click",function(dir){

        var e=window.event||event;
        var target=e.target  || e.srcElement;
        dir=target.id
        switch(target.id){
          case "tunLef":
            rotate("left");
            break;
          case "tunRig":
            rotate("right");
            break;
          case "tunBac":
            rotate("back");
            break;
          case "go":
            go();
            break;
          case "excute":
            var dir=moveBox.invalue.value.toLowerCase();
            rotate(dir);
            break;
          case "traDown":
            go("traDown");
            break;
          case "traRig":
            go("traRight");
            break;
          case "traTop":
            go("traTop");
            break;
          case "traLef":
            go("traLeft");
            break;
        }
    });
    
    //重绘小块的样式
    function draw(){
      moveBox.box.style.cssText='transform:rotate('+ (moveBox.current) +'deg);';
      moveBox.box.style.left=moveBox.left+"px";
      moveBox.box.style.top=moveBox.topl+"px";
      moveBox.message.innerHTML="";
    }

    draw(); //显示
  
</script>
</html>

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原文地址：https://www.cnblogs.com/huansky/p/5495955.html