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Use js to imitate the 360 boot effect

王林forward: 2020-04-07 09:24:322652browse

To achieve the effect:

Click the close picture button to exit first down and then to the right.

Implementation steps:

1. Encapsulate the motion function

2. Set a box for closing on the picture

3. Register a click event for the closing box After clicking

4. The height of the lower picture is 0, set a easing animation

5. The width of the upper picture is 0, set a easing animation

Easing animation code (with callback function): `

 function getStyle(obj,attr){ //兼容性写法获得样式
        if(window.getComputedStyle){ 
          return window.getComputedStyle(obj, null)[attr];
        }else{
          return obj.currentStyle[attr];
        }
      }
       function animate(obj, json, speed, callback){
        clearInterval(obj.timer);
        obj.timer = setInterval(function(){
          var flag = true;
          for(var attr in json){
          var current = parseInt(getStyle(obj,attr));
          var step = (json[attr] - current) / 10;
           step = step > 0 ? Math.ceil(step) : Math.floor(step);
           obj.style[attr] = current + step +&#39;px&#39;;
          if(current != json[attr]){
            flag = false;
          }
        }
         if(flag){ 
          clearInterval(obj.timer);
          if(callback && typeof callback == &#39;function&#39;){ //验证callback是否传递，传递的话看是否是函数类型
           callback();
          }
         }
        },speed);
      }

Boot-up picture, composed of two pictures

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title></title>
  <style>
    .box{
      width: 322px;
      position: fixed;
      bottom:0;
      right:0;
    }
    span{
      position: absolute;
      top:0;
      right:0;
      width:30px;
      height: 20px;
      cursor: pointer;
    }
    .box img{
      vertical-align: top;
    }
  </style>
  <script type="text/javascript" src="函数封装.js"></script>
  <script type="text/javascript">
    function $(id){
      return document.getElementById(id);
    }
    window.onload = function(){
      var span = document.getElementsByTagName(&#39;span&#39;)[0];
      var box = $(&#39;box&#39;);
      var bottom = $(&#39;bt&#39;);
      var top = $(&#39;hd&#39;);
      span.onclick = function(){
        var json = {"height": 0};
        animate(bottom,json,20,function(){
        animate(box,{"width":0},20);
        });
      }
    }
  </script>
</head>
<body>
<div id="box">
  <span></span>
  <div id="hd">
    <img src="images/t.jpg" alt=""/>
  </div>
  <div id="bt">
    <img src="images/b.jpg" alt=""/>
  </div>
</div>
</body>
</html>

The effect is as follows:

Use js to imitate the 360 boot effect

Related tutorial recommendations: js tutorial

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