高德地图API使用（根据地址查经纬度，计算二个坐标之间的距离）
根据地址查经纬度：
https://restapi.amap.com/v3/geocode/geo?address=广西壮族自治区南宁市西乡塘区衡阳西路34号&output=JSON&key=38f05ba13d4324325
返回：
{
"status": "1",
"info": "OK",
"infocode": "10000",
"count": "1",
"geocodes": [
{
"formatted_address": "广西壮族自治区南宁市西乡塘区衡阳西路34号",
"country": "中国",
"province": "广西壮族自治区",
"citycode": "0771",
"city": "南宁市",
"district": "西乡塘区",
"township": [],
"neighborhood": {
"name": [],
"type": []
},
"building": {
"name": [],
"type": []
},
"adcode": "450107",
"street": "衡阳西路",
"number": "34号",
"location": "108.304040,22.830050",
"level": "门址"
}
]
}
计算二个坐标之间的距离：
返回：
{
"status": "1",
"info": "OK",
"infocode": "10000",
"count": "1",
"results": [
{
"origin_id": "1",
"dest_id": "1",
"distance": "6447",
"duration": "1194"
}
]
}