问重新设置画布笔画每一次通过功能(动画)的迭代。多么?

EN

var rippleEffect = function(){

var co = []; 

for(var i=0; i<=5; i++){
var r = Math.floor(Math.random()*250); 

co.push(r); 
//each time through the loop throws/pushes 6 random numbers to array 'co' for bezier curve.
}

  var canvas = document.getElementById('brainWave');
  var context = canvas.getContext('2d');

  context.beginPath();
  context.moveTo(500, 75);
  context.bezierCurveTo(co[0], co[1], co[2], co[3], co[4], co[5]);


  context.lineWidth = 2;

  // line color
  context.strokeStyle = '#444';

  context.stroke(); //exicute the stroke based on the structions we've provided. 




};

setInterval(ripple,100); //this re-calls the functions every few miller-seconds.