利用半径找到经纬度

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//获取经纬度   getLocation() {     let self = this;     let list = [];     let radius = this.data.currentScope // 获取当前半径 // envelopeList = ['445','666','1002']     self.data.envelopeList.forEach((item, index) => {       let rotate = Math.random()*360; //获取随机弧度,需要把弧度转化为度,三角函数获取经纬度       var x = (Math.round(Math.cos(rotate * Math.PI / 180) * 1000000) / 1000000 * item) * 0.00000899;       var y = (Math.round(Math.sin(rotate * Math.PI / 180) * 1000000) / 1000000 * item) * 0.00001141;       let data = {         'latitude': self.data.latitude + x,         'longitude': self.data.longitude + y,         'width': 50,         'height': 60,       }       if (item <= radius) {          data['id'] = index + 100;       }else{         data.id = index       }       if (item <= 1000) {         data.iconPath = self.data.normalIco;       } else if (item <= 1200) {         data.iconPath = self.data.mediumIcon       } else {         data.iconPath = self.data.advancedIco         data.width = 75;         data.height = 60       }       list.push(data)     })     self.setData({       markers:list     })         },