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div匀速移动动画与变速移动动画…..

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  • Post category:其他


1.匀速移动代码 

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>title</title>
  <style>
    * {
      margin: 0;
      padding: 0;
    }
 
    div {
      margin-top: 20px;
      width: 200px;
      height: 100px;
      background-color: green;
      position: absolute;
      left: 0;
      top: 0;
    }
  </style>
</head>
<body>
<input type="button" value="移动到400px" id="btn1"/>
<input type="button" value="移动到800px" id="btn2"/>
<div id="dv">
  <script src="common.js"></script>
  <script>
    //点击按钮移动div
 
    my$("btn1").onclick = function () {
      animate(my$("dv"), 400);
    };
    my$("btn2").onclick = function () {
      animate(my$("dv"), 800);
    };
 
    //匀速动画
    function animate(element, target) {
      //清理定时器
      clearInterval(element.timeId);
      element.timeId = setInterval(function () {
        //获取元素的当前位置
        var current = element.offsetLeft;
        //移动的步数
        var step = 10;
        step = target > current ? step : -step;
        current += step;
        if (Math.abs(current - target) > Math.abs(step)) {
          element.style.left = current + "px";
        } else {
          clearInterval(element.timeId);
          element.style.left = target + "px";
        }
      }, 20);
    }
  </script>
</div>
</body>
</html>

2.变速移动代码 

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>title</title>
  <style>
    * {
      margin: 0;
      padding: 0;
    }
 
    div {
      margin-top: 20px;
      width: 200px;
      height: 100px;
      background-color: green;
      position: absolute;
      left: 0;
      top: 0;
    }
  </style>
</head>
<body>
<input type="button" value="移动到400px" id="btn1"/>
<input type="button" value="移动到800px" id="btn2"/>
<div id="dv">
  <script src="common.js"></script>
  <script>
    //点击按钮移动div
 
    my$("btn1").onclick = function () {
      animate(my$("dv"), 400);
    };
    my$("btn2").onclick = function () {
      animate(my$("dv"), 800);
    };
 
    //变速动画
    function animate(element, target) {
      //清理定时器
      clearInterval(element.timeId);
      element.timeId = setInterval(function () {
        //获取元素的当前位置
        var current = element.offsetLeft;
        //移动的步数
        var step = (target-current)/10;
        step = step>0?Math.ceil(step):Math.floor(step);
        current += step;
        element.style.left = current + "px";
        if(current==target) {
          //清理定时器
          clearInterval(element.timeId);
        }
       
      }, 20);
    }
  </script>
</div>
</body>
</html>

3:common.js 

/**
 * 获取指定标签对象
 * @param id 标签的id属性值
 * @returns {Element}根据id属性值返回指定标签对象
 */
function my$(id) {
    return document.getElementById(id);
}