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分类: JavaScript

2016-08-11 08:36:25



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  1. <!DOCTYPE html>
  2. <html>
  3.     <head>
  4.         <meta charset="utf-8" />
  5.         <title>moveBox 移动的盒子</title>
  6.         <style type="text/css">
  7.         *{
  8.             margin:0;
  9.             padding: 0;;
  10.         }
  11.             #father{
  12.                 width: 600px;
  13.                 height: 400px;
  14.                 border:1px solid black;
  15.                 margin: 0 auto;
  16.                 background: bisque;
  17.                 
  18.                 
  19.             }
  20.             #son{
  21.                 width: 50px;
  22.                 height: 50px;
  23.                 border-radius: 100px;
  24.                 background:yellow ;
  25.             }
  26.         </style>
  27.     </head>
  28.     <body>
  29.         <div id="father">
  30.             <div id="son">
  31.                 
  32.                 
  33.                 <script type="text/javascript">
  34.                     //获取父标签father、
  35.                     var Father = document.getElementById("father");
  36.                     console.log(Father);
  37.                     //获取子标签son
  38.                     var Son = document.getElementById("son");
  39.                     console.log(Son);
  40.                     //获取父级Father的内容宽度和高度
  41.                     var FatherWidth = Father.clientWidth;
  42.                     var FatherHeight =Father.clientHeight;
  43.                     //获取字迹son自身的高宽
  44.                     var SonWidth = Son.offsetWidth;
  45.                     var SonHeight = Son.offsetHeight;
  46.                     //获取宽高边界条件
  47.                     var Maxwidth = FatherWidth - SonWidth;
  48.                     var MaxHeight = FatherHeight -SonHeight;
  49.                     var a = SonWidth;
  50.                     var b = SonHeight;
  51.                     var x=0;
  52.                     var y=0;
  53.                     function Boxmove(){
  54.                     //小球在x轴上的向右移动,
  55.                     if(x == 0){
  56.                         if(a<Maxwidth){
  57.                             a++;
  58.                             son.style.marginLeft= a+'px';
  59.                         }else{
  60.                             x=1;
  61.                         }
  62.                     }
  63.                       //小球在x轴上的向左移动,
  64.                     if( x == 1){
  65.                         if(a>0){
  66.                             a--;
  67.                             son.style.marginLeft = a+'px';
  68.                         }else{
  69.                             x=0;
  70.                         }
  71.                     }
  72.                       //小球在xy轴上的向下移动,
  73.                     if(y == 0){
  74.                         if( b< MaxHeight){
  75.                             b++;
  76.                             son.style.marginTop= b+'px';
  77.                         }else{
  78.                             y = 1;
  79.                         }
  80.                     }
  81.                   //小球在y轴上的向上移动,
  82.                     if(y == 1){
  83.                         if(b>0){
  84.                             b--;
  85.                             son.style.marginTop=b+'px';
  86.                         }else{
  87.                             y = 0;
  88.                         }
  89.                     }
  90.                 }
  91.                     setInterval(Boxmove,0.5);//没0.005秒计时器重复执行一次该函数
  92.                     
  93.                     
  94.                     
  95.                         
  96.                 </script>
  97.                 
  98.                 
  99.             </div>
  100.         </div>
  101.         
  102.     </body>
  103. </html>

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