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JavaScript buffer motion implementation method (2 examples)_javascript skills

WBOYOriginal: 2016-05-16 15:21:071212browse

The example in this article describes the implementation method of JavaScript buffer motion. Share it with everyone for your reference, the details are as follows:

Implementation principle: (target distance - current distance) / base = speed (the greater the distance, the smaller the speed, and the distance and speed are inversely proportional)

Copy code The code is as follows:

(500 - oDiv.offsetLeft) / 7 = iSpeed;

Note: : When the calculated speed contains decimals, it needs to be rounded;

Copy code The code is as follows:

(500 - oDiv.offsetLeft) / 7 = iSpeed; iSpeed ​​= iSpeed>0? Math.ceil(iSpeed):Math.floor(iSpeed);

Example 1: Slider buffer movement

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>缓冲运动</title>
<style>
#div1{ width:100px; height:100px; background:red; position:absolute; top:50px; left:0;}
span{ width:1px; height:300px; background:black; position:absolute; left:300px; top:0; display:block;}
</style>
<script>
window.onload = function()
{
 var oBtn = document.getElementById('btn1');
 var oDiv = document.getElementById('div1');
 oBtn.onclick = function()
 {
  startMove(oDiv, 300);
 };
};
var timer = null;
function startMove(obj, iTarget)
{
 clearInterval(timer);
 timer = setInterval(function(){
  var iSpeed = (iTarget - obj.offsetLeft)/8;
  iSpeed = iSpeed>0&#63;Math.ceil(iSpeed):Math.floor(iSpeed);
  if(iTarget==obj.offsetLeft){
   clearInterval(timer);
  }else{
   obj.style.left = obj.offsetLeft + iSpeed + 'px';
  }
 }, 30);
}
</script>
</head>
<body>
<input id="btn1" type="button" value="移动" />
<div id="div1"></div>
<span></span>
</body>
</html>

Example 2: Sidebar sliding

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>侧边栏滑动</title>
<style>
#div1{ width:100px; height:100px; background:red; position:absolute; right:0; top:0;}
</style>
<script>
window.onload = window.onscroll = function()
{
 var oDiv = document.getElementById('div1');
 var iScrollTop = document.documentElement.scrollTop || document.body.scrollTop;
 var clientHeight = document.documentElement.clientHeight;
 var iH = (clientHeight - oDiv.offsetHeight)/2 + iScrollTop;
 //oDiv.style.top = iH + 'px';
 startMove(oDiv, parseInt(iH));
};
var timer = null;
function startMove(obj, iTarget)
{
 clearInterval(timer);
 timer = setInterval(function(){
  var iSpeed = (iTarget - obj.offsetTop) / 8;
  iSpeed = iSpeed>0&#63;Math.ceil(iSpeed):Math.floor(iSpeed);
  if(obj.offsetTop == iTarget){
   clearInterval(timer);
  }else{
   obj.style.top = obj.offsetTop + iSpeed + 'px';
  }
 }, 30);
}
</script>
</head>
<body style="height:2000px;">
<div id="div1"></div>
</body>
</html>

For more content related to JavaScript motion effects, please view the special topic on this site: " Summary of JavaScript motion effects and techniques"

I hope this article will be helpful to everyone in JavaScript programming.

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