uni-app 经纬度坐标距离计算

js版本：

distance(la1, lo1, la2, lo2) {  
            var La1 = la1 * Math.PI / 180.0;  
            var La2 = la2 * Math.PI / 180.0;  
            var La3 = La1 - La2;  
            var Lb3 = lo1 * Math.PI / 180.0 - lo2 * Math.PI / 180.0;  
            var s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(La3 / 2), 2)   Math.cos(La1) * Math.cos(La2) * Math.pow(Math.sin(Lb3 / 2), 2)));  
            s = s * 6378.137;//地球半径  
            s = Math.round(s * 10000) / 10000;  
            console.log("计算结果",s,'KM');   
        }

写php接口时，可以用下面的方法来计算距离。

php版本：

/**  
 * 计算两点之间直线距离  
 * @param float $lon1    经度  
 * @param float $lat1    维度  
 * @param float $lon2    经度  
 * @param float $lat2    维度  
 * @return float         浮点数  
 */  
function distance($lon1, $lat1, $lon2, $lat2){  
    return (2*ATAN2(SQRT(SIN(($lat1-$lat2)*PI()/180/2)  
            *SIN(($lat1-$lat2)*PI()/180/2)   
            COS($lat2*PI()/180)*COS($lat1*PI()/180)  
            *SIN(($lon1-$lon2)*PI()/180/2)  
            *SIN(($lon1-$lon2)*PI()/180/2)),  
            SQRT(1-SIN(($lat1-$lat2)*PI()/180/2)  
                    *SIN(($lat1-$lat2)*PI()/180/2)  
                     COS($lat2*PI()/180)*COS($lat1*PI()/180)  
                    *SIN(($lon1-$lon2)*PI()/180/2)  
                    *SIN(($lon1-$lon2)*PI()/180/2))))*6378140;  
}  
echo distance(116.3896,39.91917,116.3940,39.91726);