javascript计算渐变颜色的实例

function getItemColors (colorLevel) {   var colors= [];   //默认的最深颜色   var red = 134,green = 108, blue = 184;   //最浅颜色是239,239,239 比如：最浅颜色的red是 239 则差值为239-134=105   var maxRed = 105,maxGreen = 131,maxBlue = 55;   var level = colorLevel;   while(level--) {     colors.push( 'rgb('+red +','+green+','+blue+')');     red += parseInt(maxRed/colorLevel);     green += parseInt(maxGreen/colorLevel);     blue += parseInt(maxBlue/colorLevel);   }   return colors; }