family-education/education_uni/mixins/compute-distance.js

export default {
	methods: {
		space(lat1, lng1, lat2, lng2) {
			var radLat1 = lat1 * Math.PI / 180.0;
			var radLat2 = lat2 * Math.PI / 180.0;
			var a = radLat1 - radLat2;
			var b = lng1 * Math.PI / 180.0 - lng2 * Math.PI / 180.0;
			var s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2) +
					Math.cos(radLat1) * Math.cos(radLat2) * Math.pow(Math.sin(b / 2), 2)));
			s = s * 6378.137;
			s = Math.round(s * 10000) / 10000;	// 单位千米
			return s.toFixed(2)	// 保留两位小数
		},
	}
}