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Detailed explanation of the steps to implement flying page special effects using JS

php中世界最好的语言Original: 2018-05-23 10:03:162152browse

This time I will bring you a detailed explanation of the steps to implement flying page special effects with JS. What are the precautions for implementing flying page special effects with JS. The following is a practical case, let’s take a look.

This effect uses a motion function encapsulated by itself; the cleverness of this effect is that it uses an array to store the position information of each li at the beginning, and then when the button (page number) is clicked, the li's The changes in width, height, position and transparency disappear one by one, and then appear upside down one after another; they can be matched with the page number to achieve the effect of page number replacement

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title> JS飞入效果</title>
  <link rel="stylesheet" href="stylesheets/base.css" rel="external nofollow" >
  <style>
    body{
      background:#000;
    }
    .header{
      width: 100%;
      height: 40px;
      background:#fff;
      font:bold 30px/40px '微软雅黑';
      text-align:center;
    }
    input{
      background:#fff;
      margin-top:5px;
      width: 50px;
      height: 20px;
      font:bold 12px/20px '微软雅黑';
    }
    ul{
      width: 360px;
      height: 360px;
      margin:50px auto;
    }
    ul li{
      width: 100px;
      height: 100px;
      background:skyblue;
      float:left;
      margin:5px;
    }
  </style>
  <script src="move.js"></script>
  <script>
    window.onload=function(){
      var oBtn=document.getElementById('btn1');
      var oUl=document.getElementsByTagName('ul')[0];
      var aLi=oUl.children;
      //用数组来存放没个li的位置
      var arr=[];
      //存位置
      for(var i=0;i<aLi.length;i++) {
        arr[i] = {
        left:aLi[i].offsetLeft,
        top:aLi[i].offsetTop
        };
      }
      //给目前的li定位
      for(var i=0;i<arr.length;i++){
        aLi[i].style.position='absolute';
        aLi[i].style.left=arr[i].left+'px';
        aLi[i].style.top=arr[i].top+'px';
        aLi[i].style.margin=0;
      }
      //当点击的时候开定时器，让li一个一个的走
      var iNow=0;
      var timer=null;
      var bReady=false;
      oBtn.onclick=function(){
        if(bReady){return;}
        bReady=true;
        timer=setInterval(function(){
          move(aLi[iNow],{left:0,top:0,height:0,width:0,opacity:0},{'duration':200,'complete':function(){
            if(iNow==arr.length-1){
              clearInterval(timer);
              back();
              bReady=false;
            }
            iNow++;
          }});
        },220);
      };
      function back(){
        timer=setInterval(function(){
          iNow--;
          move(aLi[iNow],{left:arr[iNow].left,top:arr[iNow].top,height:100,width:100,opacity:1},{'duration':200,'complete':function(){
            if(iNow==0){
              clearInterval(timer);
            }
          }});
        },220);
      }
    };
  </script>
</head>
<body>
  <p class="header">飞页效果</p>
  <input type="button" value="走你" id="btn1">
  <ul>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
  </ul>
</body>
</html>

Motion function move. js:

/**
 * Created by Jason on 2016/11/7.
 */
function getStyle(obj,sName){
  return (obj.currentStyle || getComputedStyle(obj,false))[sName];
}
function move(obj,json,options){
  var options=options || {};
  var duration=options.duration || 1000;
  var easing=options.easing || 'linear';
  var start={};
  var dis={};
  for(name in json){
    start[name]=parseFloat(getStyle(obj,name));
    dis[name]=json[name]-start[name];
  }
  //start {width:50,} dis {width:150}
  //console.log(start,dis);
  var count=Math.floor(duration/30);
  var n=0;
  clearInterval(obj.timer);
  obj.timer=setInterval(function(){
    n++;
    for(name in json){
      switch (easing){
        case 'linear':
          var a=n/count;
          var cur=start[name]+dis[name]*a;
          break;
        case 'ease-in':
          var a=n/count;
          var cur=start[name]+dis[name]*a*a*a;
          break;
        case 'ease-out':
          var a=1-n/count;
          var cur=start[name]+dis[name]*(1-a*a*a);
          break;
      }
      if(name=='opacity'){
        obj.style.opacity=cur;
      }else{
        obj.style[name]=cur+'px';
      }
    }
    if(n==count){
      clearInterval(obj.timer);
      options.complete && options.complete();
    }
  },30);
}

The operation effect is as follows:

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website !

Detailed explanation of the steps to implement flying page special effects using JS

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