js method to achieve exchange motion effect_javascript skills-JS Tutorial-php.cn

js method to achieve exchange motion effect_javascript skills

WBOY

Release： 2016-05-16 16:05:00

Original

1079 people have browsed it

The example in this article describes the method of realizing the exchange motion effect in js. Share it with everyone for your reference. The specific analysis is as follows:

To achieve the effect, click to exchange the position and distance information of the left and upper corners.

Point 1:

var now = s_pic_li[0];
for(var i=0; i<s_pic_li.length; i++){
s_pic_li[i].onclick = function(){
if(this == now) return false;
var w = now.offsetWidth;
var h = now.offsetHeight;
var l = now.offsetLeft;
var t = now.offsetTop;
var w1= this.offsetWidth;
var h1 = this.offsetHeight;
var l1 = this.offsetLeft;
var t1 = this.offsetTop;
startrun(now,{width:w1,height:h1,left:l1,top:t1});
startrun(this,{width:w,height:h,left:l,top:t});
now=this;
}
}

Copy after login

Loop to add a click event to each block, obtain information from both parties, and then execute the motion function with the relevant information as parameters.

Finally, add the code:

<!DOCTYPE html>
<html>
<head>
<meta charset="gb2312" />
<title>无标题文档</title>
<style>
<!--
body,ul,li{margin:0; padding:0;
font:18px/1.5 arial; color:#333;}
#big_pic{width:500px; height:400px;
background:#ccc; text-align:center;
position:absolute;}
#s_pic li{float:left; width:100px;
height:80px; display:inline;
background:#06c; text-align:center;
position:absolute; top:310px;}
-->
</style>
<script>
<!--
window.onload = function(){
 var s_pic = document.getElementById("s_pic");
 var s_pic_li = s_pic.getElementsByTagName("li");
 var now = s_pic_li[0];
 for(var i=0; i<s_pic_li.length; i++){
  s_pic_li[i].onclick = function(){
   if(this == now) return false;
   var w = now.offsetWidth;
   var h = now.offsetHeight;
   var l = now.offsetLeft;
   var t = now.offsetTop;
   var w1= this.offsetWidth;
   var h1 = this.offsetHeight;
   var l1 = this.offsetLeft;
   var t1 = this.offsetTop;
   startrun(now,{width:w1,height:h1,left:l1,top:t1});
   startrun(this,{width:w,height:h,left:l,top:t});
   now=this;
  }
 }
}
function getstyle(obj,name){
 if(obj.currentStyle){
  return obj.currentStyle[name];
 }else{
  return getComputedStyle(obj,false)[name];
 }
}
function startrun(obj,json,fn){
 clearInterval(obj.timer);
 obj.timer = setInterval(function(){
  var isall = true; 
  for(var attr in json){
   var cur=0;
   if(attr == "opacity"){
    cur = Math.round(parseFloat(getstyle(obj,attr))*100);
   }else{
    cur = parseInt(getstyle(obj,attr));
   }
   var speed = (json[attr] - cur)/8
   speed = speed>0&#63;Math.ceil(speed):Math.floor(speed);
   if(cur != json[attr]){
    isall = false;
   }
   if(attr == "opacity"){
    obj.style.filter = "alpha(opacity="+(cur+speed)+")";
    obj.style.opacity = (cur+speed)/100;
   }else{
    obj.style[attr] = cur+speed+"px";
   }
  }
  if(isall){
   clearInterval(obj.timer);
   if(fn){
    fn();
   }
  }
 },30);
}
//-->
</script>
</head>
<body>
<ul id="s_pic">
 <li style="left:0; top:0; width:400px; height:300px">0</div>
 <li style="left:0;">1</li>
 <li style="left:110px;">2</li>
 <li style="left:220px;">3</li>
 <li style="left:330px;">4</li>
</ul>
</body>
</html>

Copy after login

I hope this article will be helpful to everyone’s JavaScript programming design.