创建随机颜色的函数

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function getRandomColor(){
   var colorArr = ['1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'];
   var color = "";
   for(var i = 0; i < 6; i++){
    color += colorArr[Math.floor(Math.random()*16)]; 
   }
   return "#"+color;
}