Detailed explanation of the role of buffering motion in JS-JS Tutorial-php.cn

Detailed explanation of the role of buffering motion in JS

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Release： 2018-05-14 14:29:17

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This time I will bring you a detailed explanation of the role of JS in implementing buffering motion. What are the precautions for JS to implement buffering motion? Here is a practical case, let’s take a look.

Buffering requires numerical rounding, rounding up: Math.ceil() Rounding downMath.floor()

The effect of slowly slowing down the moving speed, moving speed = (end position - current position) / a number

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>JS缓冲运动</title>
<style>
#p{
  width:150px;
  height:150px;
  background:#0C6;
  position:absolute;
  left:0;
  top:50px;
}
#p2{
  background:#000;
  height:600px;
  position:absolute;
  left:500px;
  width:2px;
}
</style>
</head>
<script>
var speed;
var time;
window.onload = function(){
  var btn = document.getElementById('btn');
  btn.onclick = function(){
    speed = 0;
    move(500);
  };
  btn2.onclick = function(){
    speed = 0;
    move(0);
  };
};
function move(e){
  var p = document.getElementById('p');
  clearInterval(time);
  time = setInterval(function(){
    //改变位置，如果向左则e==500， 向上取整， 否则向右，向下取整，速度=(终点位置 - 当前位置)/一个数
    e==500 ? speed = Math.ceil((e-(p.offsetLeft))/30):speed = Math.floor((e-(p.offsetLeft))/30)
    if (e <= p.style.left){//达到，关闭定时器
      clearInterval(time);
    }
    else
    {
      p.style.left = p.offsetLeft+speed+&#39;px&#39;;
    }
  },30);
};
</script>
<body>
<input type="button" value="向右运动" id="btn" />
<input type="button" value="向左运动" id="btn2" />
<p id = "p">
</p>
<p id = "p2">
</p>
</body>
</html>

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