Android和iOS的测试结果不一样。
iOS的似乎单位就是「米」，Android的设置为50，显示的半径大概是150米。
因为我要用圆包住所有marker，距离值和坐标都是服务器返回的，都是一致的，不区分机型。
实测安卓上如果 /3，那就差不多是预计值。
感觉是bug，求confirm。
另外最新版本的开发者工具下，如果不填写「color」属性（可选）显示不出circle并且有「渲染错误」。
真机看了一下vConsole没有提示错误的。
VM124:1 Tue Jan 10 2017 15:15:39 GMT+0800 (CST) 渲染层错误
VM124:2 webviewScriptError
Cannot read property 'indexOf' of undefined;Exparser Property Observer Error @ wx-map#circlesChanged
TypeError: Cannot read property 'indexOf' of undefined
at r._transformColor (http://1964187184.debug.open.weixin.qq.com/apps/liemo/pages/index/index.html:24:6693)
at http://1964187184.debug.open.weixin.qq.com/apps/liemo/pages/index/index.html:24:14945
at Array.map (native)
at r.circlesChanged (http://1964187184.debug.open.weixin.qq.com/apps/liemo/pages/index/index.html:24:14766)
at Function.n.safeCallback (http://1964187184.debug.open.weixin.qq.com/apps/liemo/pages/index/index.html:21:18872)
at r.set [as circles] (http://1964187184.debug.open.weixin.qq.com/apps/liemo/pages/index/index.html:21:29025)
at t.applyProperties (http://1964187184.debug.open.weixin.qq.com/apps/liemo/pages/index/index.html:27:4512)
at Function.value (http://1964187184.debug.open.weixin.qq.com/apps/liemo/pages/index/index.html:27:9571)
at e.value (http://1964187184.debug.open.weixin.qq.com/apps/liemo/pages/index/index.html:27:9035)
at http://1964187184.debug.open.weixin.qq.com/apps/liemo/pages/index/index.html:27:10860
(anonymous) @ VM124:2
VM125:1 Tue Jan 10 2017 15:15:39 GMT+0800 (CST) 渲染层错误
VM125:2 Exparser Property Observer Error @ wx-map#circlesChanged
(anonymous) @ VM125:2
VM126:1 Tue Jan 10 2017 15:15:39 GMT+0800 (CST) 渲染层错误
VM126:2 TypeError: Cannot read property 'indexOf' of undefined
at r._transformColor (http://1964187184.debug.open.weixin.qq.com/apps/liemo/pages/index/index.html:24:6693)
at http://1964187184.debug.open.weixin.qq.com/apps/liemo/pages/index/index.html:24:14945
at Array.map (native)
at r.circlesChanged (http://1964187184.debug.open.weixin.qq.com/apps/liemo/pages/index/index.html:24:14766)
at Function.n.safeCallback (http://1964187184.debug.open.weixin.qq.com/apps/liemo/pages/index/index.html:21:18872)
at r.set [as circles] (http://1964187184.debug.open.weixin.qq.com/apps/liemo/pages/index/index.html:21:29025)
at t.applyProperties (http://1964187184.debug.open.weixin.qq.com/apps/liemo/pages/index/index.html:27:4512)
at Function.value (http://1964187184.debug.open.weixin.qq.com/apps/liemo/pages/index/index.html:27:9571)
at e.value (http://1964187184.debug.open.weixin.qq.com/apps/liemo/pages/index/index.html:27:9035)
at http://1964187184.debug.open.weixin.qq.com/apps/liemo/pages/index/index.html:27:10860
(anonymous) @ VM126:2
测试机型：
Android --- 红米Note3最新版本stable ROM
iOS --- iPhone 5c/ iOS 10.2
var resultRange = [{
latitude: lat,
longitude: lng,
color: "#00000000",
fillColor: "#7fbafd3f",
radius: (farestDistance + 10)
}];
