ctx.fillStyle = rgba(red,green,blue,alp);
var red = Math.round(Math.random()*255);
var green = Math.round(Math.random()*255);
var blue = Math.round(Math.random()*255);
var alp = 1;
ctx.fillStyle = rgba(red,green,blue,alp);
var red = Math.round(Math.random()*255);
var green = Math.round(Math.random()*255);
var blue = Math.round(Math.random()*255);
var alp = 1;本文标题：十二、canvas随机颜色
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