代码片段：
<label for="wander">wander <span>(how far do you stray?)</span></label><br />
<input id="wander" value="0.05" min="0.05" step="0.05" type="number"><br />
<label for="friction">friction <span>(f>1: faster, faster! f<1: slow....)</span></label><br />
<input id="friction" value=".9" min="0.5" step="0.05" type="number"><br />
<label for="mouseDistance">mouse distance <span>(how far do you feel it?)</span>:</label><br />
<input id="mouseDistance" value="100" min="0" step="5" type="number"><br />
<label for="mouseForce">mouse force <span>(how powerful is the effect!)</span></label><br />
<input id="mouseForce" value="0.05" min="0" step="0.05" type="number"><br />
<label for="springForce">particle spring force: <span>(springy or bouncy (strict or flexible))</span></label><br />
<input id="springForce" value="0.01" min="0" step="0.01" type="number"><br />
