34 lines
900 B
JavaScript
34 lines
900 B
JavaScript
class utils {
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/**
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* 计算两经纬度点之间的距离(单位：米)
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* @param {*} lat1 纬度1
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* @param {*} lng1 经度1
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*
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* @param {*} lat2 纬度2
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* @param {*} lng2 经度2
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* @returns
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*/
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caculateLL(lng1, lat1, lng2 = 117.325426, lat2 = 31.794477) {
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var radLat1 = (lat1 * Math.PI) / 180.0;
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var radLat2 = (lat2 * Math.PI) / 180.0;
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var a = radLat1 - radLat2;
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var b = (lng1 * Math.PI) / 180.0 - (lng2 * Math.PI) / 180.0;
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var s =
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2 *
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Math.asin(
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Math.sqrt(
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Math.pow(Math.sin(a / 2), 2) +
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Math.cos(radLat1) *
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Math.cos(radLat2) *
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Math.pow(Math.sin(b / 2), 2)
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)
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);
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s = s * 6378.137;
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s = Math.round(s * 10000) / 10;
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return s;
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}
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}
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module.exports = new utils(); |