【代码】人物行走效果

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前端

人物行走效果

准备工作

  • 人物行走图素材

源代码

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <style>

    * {
      margin: 0;
      padding: 0;
    }

    .cur {
      position: relative;
      width: 32px;
      height: 48px;
      background: url("img/01.png");
      /* 背景图定位*/
      background-position: 0px -96px;
    }

  </style>
</head>
<body>

<div class="cur"></div>

</body>
</html>
<script>

  let div = document.querySelector(".cur");

  /*
  * step_left：动图左边距步进
  */
  let step_left = 0;

  /*
  * status：行走路线状态
  *     0：从左往右
  *     1：从上往下
  *     2：从右往左
  *     3：从下往上
  */
  let status = 0;

  // 设定div左外边距
  let l = 0;
  // 设定div上外边距
  let t = 0;

  setInterval(function() {

    // 每次计时器变动，动图步进叠加
    step_left += 1;
    if (step_left > 3) {
      step_left = 0;
    }

    switch (status) {
      case 0:
        l += 10;
        div.style.backgroundPosition = -32*step_left + "px " + -48*2 + "px";
        div.style.left = l + "px";
        if (l >= 200) {
          status = 1;
        }
        break;
      case 1:
        t += 10;
        div.style.backgroundPosition = -32*step_left + "px " + -48*0 + "px";
        div.style.top = t + "px";
        if (t >= 100) {
          status = 2;
        }
        break;
      case 2:
        l -= 10;
        div.style.backgroundPosition = -32*step_left + "px " + -48*1 + "px";
        div.style.left = l + "px";
        if (l <= 0) {
          status = 3;
        }
        break;
      case 3:
        t -= 10;
        div.style.backgroundPosition = -32*step_left + "px " + -48*3 + "px";
        div.style.top = t + "px";
        if (t <= 0) {
          status = 0;
        }
        break;
    }

    console.log(`调试>当前status:${status},当前left:${l},当前top:${t},当前动图步进:${step_left}`);

  }, 100);

</script>

完成

参考文献

哔哩哔哩——web前端小清风