js如何生成随机的颜色（代码示例）

var shine=0.8;

var arrays = ['[255,182,193,0.8]','[144,238,144,0.8]','[255,235,205,0.8]','[240,128,128,0.8]','[255,186,0,0.8]','[255,225,1,0.8]','[227,229,241,0.8]','[248,228,239,0.8]','[223,237,224,0.8]','[249,236,191,0.8]'];
function randomColor(random,size){
 if(size==2){
 if(shine<1){
 a--;
 if(a==0){
 shine=parseFloat(shine)+0.2; 
 
 }
 arrays=['[255,182,193,'+shine+']','[144,238,144,'+shine+']','[255,235,205,'+shine+']','[240,128,128,'+shine+']','[255,186,0,'+shine+']','[255,225,1,'+shine+']','[227,229,241,'+shine+']','[248,228,239,'+shine+']','[223,237,224,'+shine+']','[249,236,191,'+shine+']'];
 }
 }else if(size==3){
 if(shine>0.2){
 a--;
 if(a==0){
 shine=(shine-0.2).toFixed(1);
 }
 arrays=['[255,182,193,'+shine+']','[144,238,144,'+shine+']','[255,235,205,'+shine+']','[240,128,128,'+shine+']','[255,186,0,'+shine+']','[255,225,1,'+shine+']','[227,229,241,'+shine+']','[248,228,239,'+shine+']','[223,237,224,'+shine+']','[249,236,191,'+shine+']'];
 
 }
 
 };
 //var arrays = ['[123,104,238,0.5]','[0,255,255,0.5]','[0,250,154,0.5]','[0,255,0,0.5]','[255,255,0,0.5]','[255,165,0,0.5]','[178,34,34,0.5]','[148,0,211,0.5]','[255,250,205,0.5]','[255,215,0,0.5]'];
 //var r = Math.floor(Math.random()*256);
 //var g = Math.floor(Math.random()*256);
 //var b = Math.floor(Math.random()*256);
 return arrays[random];//"["+r+","+g+","+b+", 0.7]";
}