如何循环获取html的值，并拼写到json/json,求value所对应key的值

有如下html结构

<tr>

<span class="originalAirportId">123</span>

<span class="airportName">123</span>

<span class="cityName">123</span>

<span class="provinceName">123</span>

<span class="provinceId">123</span>

<span class="countryId">123</span>

<span class="countryName">123</span>

</tr>

<tr>

<span class="originalAirportId">123</span>

<span class="airportName">123</span>

<span class="cityName">123</span>

<span class="provinceName">123</span>

<span class="provinceId">123</span>

<span class="countryId">123</span>

<span class="countryName">123</span>

</tr>

<tr>

<span class="originalAirportId">123</span>

<span class="airportName">123</span>

<span class="cityName">123</span>

<span class="provinceName">123</span>

<span class="provinceId">123</span>

<span class="countryId">123</span>

<span class="countryName">123</span>

</tr>

.....

.....

.....

<tr>标签个数不确定

要求得到如下的json

{

"airportList": [

{

"originalAirportId": "123",

"airportName": "asdf",

"cityName": "qwer",

"cityId": "qwer",

"provinceName": "qwer",

"provinceId": "qwer",

"countryId": "qwer",

"countryName": "qwer"

},

{

"originalAirportId": "123",

"airportName": "asdf",

"cityName": "qwer",

"cityId": "qwer",

"provinceName": "qwer",

"provinceId": "qwer",

"countryId": "qwer",

"countryName": "qwer"

}

]

}

var findkey={"firstName":"Brett","lastName":"McLaughlin","email":"aaaa"};