// 经纬距离计算
function 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
//千米值
// s = Math.round(s* 10000) / 10000
// s = s.toFixed(2)
//米值
s = Math.round(s* 10000) / 10
s = s.toFixed(0)
return s
}