js正弦函数图

<!DOCTYPE html>
<html>
<head>
  <title>js画正弦函数图</title>
  <style type="text/css">
    *{
      margin:0;
      padding: 0;
    }
    .painter{
      position: absolute;
      top:50%;
      width:1px;
      height: 1px;
      background-color: red;
    }
  </style>
</head>
<body>
    <div class="painter"></div>
  <script type="text/javascript">
    var oDiv = document.getElementsByTagName("div")[0];
    var a_top = oDiv.offsetTop;
    for (var i = 0 ; i < 1000; i++) {
      var temp = document.createElement("div");
      temp.classList.add("painter");
      temp.style.left = i+"px";
      temp.style.top = 100*Math.sin(i/30)+a_top+"px";
      document.body.appendChild(temp);

    };




  </script>
</body>
</html>

图是用div画的，每个div都是1像素宽高+颜色，设置绝对定位，然后用Math的sin方法算出坐标，按照坐标设置div的位置即可

posted on 2018-03-30 23:59 漏三刀阅读(385) 评论(0) 编辑收藏举报