Calculate the distance between two points by the latitude and longitude of two addresses (km

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
	return s
	// console.log(s)
},