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]','[255,225,189,0.8]','[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+']','[255,225,189,'+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+']','[255,225,189,'+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]";
}