Simple implementation method of elastic motion effect in javascript

Simple implementation method of elastic motion effect in javascript_javascript skills

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Release： 2016-05-16 15:20:54

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

Principle of elastic motion: acceleration motion, deceleration motion, friction motion

The screenshot of the running effect is as follows:

The example code is as follows:

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>
#div1{ width:100px; height:100px; background:red; position:absolute; left:0; top:50px;}
</style>
<script>
window.onload = function()
{
 var oBtn = document.getElementById('btn1');
 var oDiv = document.getElementById('div1');
 oBtn.onclick = function()
 {
 startMove(oDiv, 300);
 };
};
var iSpeed = 0;
var left = 0;
function startMove(obj, iTarget)
{
 clearInterval(obj.timer);
 obj.timer = setInterval(function(){
 iSpeed += (iTarget - obj.offsetLeft)/5;
 iSpeed *= 0.7;
 left += iSpeed;
 if(Math.abs(iSpeed)<1 && Math.abs(left-iTarget)<1){
  clearInterval(obj.timer);
  obj.style.left = iTarget + 'px';
 }else{
  obj.style.left = obj.offsetLeft + iSpeed + 'px';
 }
 }, 30);
}
</script>
</head>
<body>
<input id="btn1" type="button" value="运动" />
<div id="div1"></div>
<div style="width:1px; height:300px; background:black; position:absolute; top:0; left:300px; "></div>
</body>
</html>

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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.