<!DOCTYPE>
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<html>
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<head>
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<title>Turf.js</title>
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<meta http-equiv="Expires" content="0" />
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<meta http-equiv="Cache" content="no-cache" />
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<meta http-equiv="Pragma" content="no-cache" />
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<meta http-equiv="Cache-control" content="no-cache" />
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<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0;" name="viewport" />
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<script src="js/turf.min.6.5.js"></script>
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<script>
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function pointsToPolygon(str) {
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var arr = eval(str);
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var points = [];
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for (var i = 0, c = arr.length; i < c; i += 2) {
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var p = turf.point([arr[i], arr[i + 1]]);
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points.push(p);
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}
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var fc = turf.featureCollection(points);
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var hull = turf.convex(fc);
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var area = turf.area(hull);
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return area.toFixed(2);
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}
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window.onload = function () {
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var str = "[113.23063216099904,31.21983148200005,113.23061312499972,31.219450768000044,113.23060360699967,31.21910812599997,113.2305679149997,31.218752397000046,113.23055006899986,31.21841570199999,113.230526275,31.218007625000023,113.23050485999988,31.217670932000015,113.23047154600006,31.21738182700004]";
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var rs = pointsToPolygon(str);
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console.log(rs)
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document.write(rs);
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}
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</script>
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</head>
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<body>
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</body>
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</html>
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