参考以下文章：jstz - npmTimezone detection for JavaScript. Latest version: 2.1.1, last published: 5 years ago. Start using jstz in your project by running `npm i jstz`. There are 55 other projects in the npm registry using jstz.
https://www.npmjs.com/package/jstz
在项目里面新建文件jstz.js。内容如下：
/*! jstz - v1.0.4 - 2012-12-18 */
(function(e){var t=function(){"use strict";var e="s",n=function(e){var t=-e.getTimezoneOffset();return t!==null?t:0},r=function(e,t,n){var r=new Date;return e!==undefined&&r.setFullYear(e),r.setDate(n),r.setMonth(t),r},i=function(e){return n(r(e,0,2))},s=function(e){return n(r(e,5,2))},o=function(e){var t=e.getMonth()>7?s(e.getFullYear()):i(e.getFullYear()),r=n(e);return t-r!==0},u=function(){var t=i(),n=s(),r=i()-s();return r<0?t+",1":r>0?n+",1,"+e:t+",0"},a=function(){var e=u();return new t.TimeZone(t.olson.timezones[e])},f=function(e){var t=new Date(2010,6,15,1,0,0,0),n={"America/Denver":new Date(2011,2,13,3,0,0,0),"America/Mazatlan":new Date(2011,3,3,3,0,0,0),"America/Chicago":new Date(2011,2,13,3,0,0,0),"America/Mexico_City":new Date(2011,3,3,3,0,0,0),"America/Asuncion":new Date(2012,9,7,3,0,0,0),"America/Santiago":new Date(2012,9,3,3,0,0,0),"America/Campo_Grande":new Date(2012,9,21,5,0,0,0),"America/Montevideo":new Date(2011,9,2,3,0,0,0),"America/Sao_Paulo":new Date(2011,9,16,5,0,0,0),"America/Los_Angeles":new Date(2011,2,13,8,0,0,0),"America/Santa_Isabel":new Date(2011,3,5,8,0,0,0),"America/Havana":new Date(2012,2,10,2,0,0,0),"America/New_York":new Date(2012,2,10,7,0,0,0),"Asia/Beirut":new Date(2011,2,27,1,0,0,0),"Europe/Helsinki":new Date(2011,2,27,4,0,0,0),"Europe/Istanbul":new Date(2011,2,28,5,0,0,0),"Asia/Damascus":new Date(2011,3,1,2,0,0,0),"Asia/Jerusalem":new Date(2011,3,1,6,0,0,0),"Asia/Gaza":new Date(2009,2,28,0,30,0,0),"Africa/Cairo":new Date(2009,3,25,0,30,0,0),"Pacific/Auckland":new Date(2011,8,26,7,0,0,0),"Pacific/Fiji":new Date(2010,11,29,23,0,0,0),"America/Halifax":new Date(2011,2,13,6,0,0,0),"America/Goose_Bay":new Date(2011,2,13,2,1,0,0),"America/Miquelon":new Date(2011,2,13,5,0,0,0),"America/Godthab":new Date(2011,2,27,1,0,0,0),"Europe/Moscow":t,"Asia/Yekaterinburg":t,"Asia/Omsk":t,"Asia/Krasnoyarsk":t,"Asia/Irkutsk":t,"Asia/Yakutsk":t,"Asia/Vladivostok":t,"Asia/Kamchatka":t,"Europe/Minsk":t,"Australia/Perth":new Date(2008,10,1,1,0,0,0)};return n[e]};return{determine:a,date_is_dst:o,dst_start_for:f}}();t.TimeZone=function(e){"use strict";var n={"America/Denver":["America/Denver","America/Mazatlan"],"America/Chicago":["America/Chicago","America/Mexico_City"],"America/Santiago":["America/Santiago","America/Asuncion","America/Campo_Grande"],"America/Montevideo":["America/Montevideo","America/Sao_Paulo"],"Asia/Beirut":["Asia/Beirut","Europe/Helsinki","Europe/Istanbul","Asia/Damascus","Asia/Jerusalem","Asia/Gaza"],"Pacific/Auckland":["Pacific/Auckland","Pacific/Fiji"],"America/Los_Angeles":["America/Los_Angeles","America/Santa_Isabel"],"America/New_York":["America/Havana","America/New_York"],"America/Halifax":["America/Goose_Bay","America/Halifax"],"America/Godthab":["America/Miquelon","America/Godthab"],"Asia/Dubai":["Europe/Moscow"],"Asia/Dhaka":["Asia/Yekaterinburg"],"Asia/Jakarta":["Asia/Omsk"],"Asia/Shanghai":["Asia/Krasnoyarsk","Australia/Perth"],"Asia/Tokyo":["Asia/Irkutsk"],"Australia/Brisbane":["Asia/Yakutsk"],"Pacific/Noumea":["Asia/Vladivostok"],"Pacific/Tarawa":["Asia/Kamchatka"],"Africa/Johannesburg":["Asia/Gaza","Africa/Cairo"],"Asia/Baghdad":["Europe/Minsk"]},r=e,i=function(){var e=n[r],i=e.length,s=0,o=e[0];for(;s<i;s+=1){o=e[s];if(t.date_is_dst(t.dst_start_for(o))){r=o;return}}},s=function(){return typeof n[r]!="undefined"};return s()&&i(),{name:function(){return r}}},t.olson={},t.olson.timezones={"-720,0":"Etc/GMT+12","-660,0":"Pacific/Pago_Pago","-600,1":"America/Adak","-600,0":"Pacific/Honolulu","-570,0":"Pacific/Marquesas","-540,0":"Pacific/Gambier","-540,1":"America/Anchorage","-480,1":"America/Los_Angeles","-480,0":"Pacific/Pitcairn","-420,0":"America/Phoenix","-420,1":"America/Denver","-360,0":"America/Guatemala","-360,1":"America/Chicago","-360,1,s":"Pacific/Easter","-300,0":"America/Bogota","-300,1":"America/New_York","-270,0":"America/Caracas","-240,1":"America/Halifax","-240,0":"America/Santo_Domingo","-240,1,s":"America/Santiago","-210,1":"America/St_Johns","-180,1":"America/Godthab","-180,0":"America/Argentina/Buenos_Aires","-180,1,s":"America/Montevideo","-120,0":"Etc/GMT+2","-120,1":"Etc/GMT+2","-60,1":"Atlantic/Azores","-60,0":"Atlantic/Cape_Verde","0,0":"Etc/UTC","0,1":"Europe/London","60,1":"Europe/Berlin","60,0":"Africa/Lagos","60,1,s":"Africa/Windhoek","120,1":"Asia/Beirut","120,0":"Africa/Johannesburg","180,0":"Asia/Baghdad","180,1":"Europe/Moscow","210,1":"Asia/Tehran","240,0":"Asia/Dubai","240,1":"Asia/Baku","270,0":"Asia/Kabul","300,1":"Asia/Yekaterinburg","300,0":"Asia/Karachi","330,0":"Asia/Kolkata","345,0":"Asia/Kathmandu","360,0":"Asia/Dhaka","360,1":"Asia/Omsk","390,0":"Asia/Rangoon","420,1":"Asia/Krasnoyarsk","420,0":"Asia/Jakarta","480,0":"Asia/Shanghai","480,1":"Asia/Irkutsk","525,0":"Australia/Eucla","525,1,s":"Australia/Eucla","540,1":"Asia/Yakutsk","540,0":"Asia/Tokyo","570,0":"Australia/Darwin","570,1,s":"Australia/Adelaide","600,0":"Australia/Brisbane","600,1":"Asia/Vladivostok","600,1,s":"Australia/Sydney","630,1,s":"Australia/Lord_Howe","660,1":"Asia/Kamchatka","660,0":"Pacific/Noumea","690,0":"Pacific/Norfolk","720,1,s":"Pacific/Auckland","720,0":"Pacific/Tarawa","765,1,s":"Pacific/Chatham","780,0":"Pacific/Tongatapu","780,1,s":"Pacific/Apia","840,0":"Pacific/Kiritimati"},typeof exports!="undefined"?exports.jstz=t:e.jstz=t})(this);具体模块使用方式如下：
import jstz from '../utils/jstz'
let name = jstz.jstz.determine().name()
console.log(name) // Asia/Shanghai
