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How to implement buffering motion in js (code example)
- 不言Original
- 2018-08-31 10:25:001240browse
The content of this article is about how to implement buffering movement in js (code examples). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.
Characteristics of buffering motion
Gradually slows down and finally stops
The farther the distance, the greater the speed
The speed is determined by the distance
Speed = (target value-current value)/scaling factor
The distance is large and the speed is large.
The distance is small and the speed is small.
Speed is directly proportional to distance.
The speed must be rounded during buffering motion. If the speed is 0.9, it will directly become 0 without rounding; if the speed is greater than 0, it should be rounded up, and if it is less than 0, it should be rounded down.
Next we will make a buffering movement for a div to move from 0 to 300, and a buffering movement for a div to move from 600 to 300.
Code to implement buffering motion
<!DOCTYPE html>
<html>
<head>
<title>缓冲运动</title>
<style>
#div1{
width: 100px;
height: 100px;
background: red;
position: absolute;
/* left: 0; */
left: 600px;
top: 50px;
}
#div2{
/* 300位置的参考线 */
width: 1px;
height: 300px;
position: absolute;
left: 300px;
top: 0;
background: #000;
}
</style>
<script>
window.onload=function(){
var oBtn=document.getElementById("btn1");
oBtn.onclick=function(){
startMove();
}
}
function startMove(){
var oDiv=document.getElementById("div1");
setInterval(function(){
var speed=(300-oDiv.offsetLeft)/10;
speed=speed>0?Math.ceil(speed):Math.floor(speed);//取整
oDiv.style.left=oDiv.offsetLeft+speed+"px";
},30);
}
</script>
</head>
<body>
<input id="btn1" type="button" value="开始运动" />
<div id="div1"></div>
<div id="div2"></div>
</body>
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