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30 lines
1.0 KiB
30 lines
1.0 KiB
/**
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* 计算两点之间的距离
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* @param {number} lat1 地点1精度
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* @param {number} lon1 地点1维度
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* @param {number} lat2 地点2精度
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* @param {number} lon2 地点2维度
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* @param {number} fixed 保留几位小数,默认0,单位km
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*/
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export function calculateDistance(lat1, lon1, lat2, lon2, fixed = 0) { //计算两点距离
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let distance = 0
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if (!lat2 || !lon2) return distance
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//先强制转换一下(后端给的字符串)
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lat1 = parseFloat(lat1)
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lon1 = parseFloat(lon1)
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lat2 = parseFloat(lat2)
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lon2 = parseFloat(lon2)
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// 将角度转换为弧度
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const R = 6371; // 地球半径，单位公里
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const dLat = (lat2 - lat1) * Math.PI / 180;
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const dLon = (lon2 - lon1) * Math.PI / 180;
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lat1 = lat1 * Math.PI / 180;
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lat2 = lat2 * Math.PI / 180;
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// Haversine公式
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const a = Math.sin(dLat / 2) * Math.sin(dLat / 2) +
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Math.sin(dLon / 2) * Math.sin(dLon / 2) * Math.cos(lat1) * Math.cos(lat2);
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const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
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// 计算距离
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distance = R * c;
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return distance.toFixed(fixed)
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}
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