markers: [

{

iconPath: "/images/grower.png",

id: 1,

latitude: 22.56821,

longitude: 113.919894,

width: 30,

height: 30,

alpha:0,

callout: {

content: "微信名字：李龙\n点击查看最新一条种植记录",

color: "#000000",

id: 5,

fontSize: 14,

borderRadius: 3,

bgColor: "#fff",

padding: 10,

display: "BYCLICK",

textAlign: "left"

},

label: {

content: ""

}

}]

我把alpha设置成0，那么这个标记点不应该隐藏吗。。。。我设置成别的数字比如0.1或者0.5完全没用吗。怎么回事