This article describes the method of JavaScript to simulate parabolic motion under gravity state. Share it for your reference. The specific analysis is as follows:
This JavaScript code simulates parabola movement in gravity state, and can set the following parameters: horizontal initial velocity, longitudinal initial velocity, gravity acceleration (if this acceleration is a value that changes with time, other non-uniform acceleration movement can be achieved), animation interval time, etc.
<!doctype html><html><head><title>js parabolic motion</title><meta charset="utf-8" /><style type="text/css">*{padding:0;margin:0;}body{font-size:13px;padding:10px;}p{margin:2px;}.wrap{position:relative;width:1000px;height:550px;margin:0 auto;border:1px solid #ccc;margin-top:50px;}#fall{width:20px;font-size:1px;height:20px;background:#000;position:absolute;top:0;left:0;}</style></head><body><h3>Simulate parabolic motion in gravity state (if 1px==1mm)</h3><p>Handwidth initial velocity: <input id="Vx" type="text" value="2" />px/ms</p><p>Longiline initial velocity: <input id="Vy" type="text" value="-2" />px/ms</p><p>Grain acceleration: <input id="a" type="text" value="0.0098" />px/square ms</p><p> (If this acceleration is a value that changes over time, other non-uniform acceleration movements can be achieved.)</p><p>Unit time: <input id="t" type="text" value="10" /> (record the time interval of motion)<p><input type="button" value="demo" onclick="demo(document.getElementById('Vx').value, document.getElementById('Vy').value, document.getElementById('a').value, document.getElementById('t').value)"/></p><div><div id="fall">o</div></div></body><script type="text/javascript">function demo(x,y,a,t) {var f=document.getElementById('fall');var Vx=parseInt(x),Vy=parseInt(y),g=a,t=parseInt(t),h=0,l=0,Sx=0,Sy=0;var i=setInterval(function(){if(f){Sx+=Vx*t;l=Sx;Vy+=g*t;h+=Vy*t;f.style.left=l+'px';f.style.top=h+'px';if(h>500||l>900)clearInterval(i);}},t);}</script></html>I hope this article will be helpful to everyone's JavaScript programming.