我写了一个小程序，我希望它可以当地图缩小scale<17时覆盖物消失，不知道大神怎么做，下面是我的代码：

bindcontroltap(e) {

if (scale  < 17) {

markers: [

{

iconPath: “/images/1.png”,

id: 3,

latitude: 23.6290537532,

longitude: 113.6763632298,

width: 30,

height: 30,

alpha: 0.8,

display: none ,

callout: {

content: " 工程师 ",

color: “#ffffff”,

fontSize: 10,

borderRadius: 10,

bgColor: “#6e707c”,

padding: 5,

// display: “ALWAYS”

}

},

{

iconPath: “/resources/user.png”,

id: 4,

latitude: 23.6326040919,

longitude: 113.6791991184,

width: 30,

height: 30,

alpha: 0.8,

callout: {

content: " 工程师 ",

color: “#ffffff”,

fontSize: 10,

borderRadius: 10,

bgColor: “#6e707c”,

padding: 5,

display: “BLCLICK”

}

}

]

}

else {

markers: [

{

iconPath: “/images/1.png”,

id: 3,

latitude: 23.6290537532,

longitude: 113.6763632298,

width: 30,

height: 30,

alpha: 0.8,

display: “ALWAYS”,

callout: {

content: " 工程师 ",

color: “#ffffff”,

fontSize: 10,

borderRadius: 10,

bgColor: “#6e707c”,

padding: 5,

// display: “ALWAYS”

}

},

{

iconPath: “/resources/user.png”,

id: 4,

latitude: 23.6326040919,

longitude: 113.6791991184,

width: 30,

height: 30,

alpha: 0.8,

callout: {

content: " 工程师 ",

color: “#ffffff”,

fontSize: 10,

borderRadius: 10,

bgColor: “#6e707c”,

padding: 5,

display: “BLCLICK”

}

}

]

}