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点击弹出球
风轻云淡
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  1. <!DOCTYPE html>
  2. <html>
  3. <head>
  4. <title>html基础</title>
  5. <meta charset="UTF-8">
  6. </head>
  7. <style>
  8.     *{
  9.         padding: 0;
  10.         margin: 0;
  11.     }
  12.     .box{
  13.         width: 500px;
  14.         height: 500px;
  15.         background-color: pink;
  16.         position: relative;
  17.     }
  18. </style>
  19. <body>
  20. <button id="btn" onclick="fn()">弹出球</button>
  21. <div class="box" id="box">
  24.    </div>
  25. </div>
  27. <script>
  28.       var obox= document.getElementById('box')
  29.       var colors=['red','black','white','green','yellow']
  31.       function fn() {
  32.         var oball= document.createElement('div')
  33.          oball.style.cssText='border-radius: 50%;box-shadow: 1px 2px #666;position: absolute;background-color:red'
  34.          var wh=Math.floor(Math.random()*(50-20)+20)
  35.          oball.style.width=wh+'px'
  36.          oball.style.height=wh+'px'
  37.          oball.style.backgroundColor=colors[Math.floor(Math.random()*colors.length)]
  38.          obox.appendChild(oball)
  39.          var top = obox.clientHeight/2 - oball.offsetHeight/2;//?
  40.          var left = obox.clientWidth/2 - oball.offsetWidth/2;//?
  41.          oball.style.left=left+'px'
  42.          oball.style.top=top+'px'
  43.          var x=Math.floor(Math.random()*(7-2)+2)
  44.          var y=Math.floor(Math.random()*(7-2)+2)
  46.       setInterval(function () {
  48.           left+=x
  49.           top+=y
  52.           if (left<  obox.offsetLeft || left > (obox.offsetLeft+obox.offsetWidth-oball.offsetWidth)) {
  53.              x = -x
  54.           }
  55.           if (top < obox.offsetTop || top > (obox.offsetTop+obox.offsetHeight-oball.offsetHeight-3)) {
  56.              y = -y
  57.           }
  58.          oball.style.left=left+"px";
  59.          oball.style.top=top+"px";
  60.        }, 30)
  62.     }
  64. </script>
  66. </body>
  67. </html>
Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：
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