HTML5/CSS用户位置选择

当然，您可以使用API。这里有一个例子，基于最可靠的(Google Api)

<div id="locationField">
  <input id="autocomplete" placeholder="Enter your address"
         onFocus="geolocate()" type="text"></input>
</div>
<table id="address">
  <tr>
    <td class="label">Street address</td>
    <td class="slimField"><input class="field" id="street_number"
          disabled="true"></input></td>
    <td class="wideField" colspan="2"><input class="field" id="route"
          disabled="true"></input></td>
  </tr>
  <tr>
    <td class="label">City</td>
    <td class="wideField" colspan="3"><input class="field" id="locality"
          disabled="true"></input></td>
  </tr>
  <tr>
    <td class="label">State</td>
    <td class="slimField"><input class="field"
          id="administrative_area_level_1" disabled="true"></input></td>
    <td class="label">Zip code</td>
    <td class="wideField"><input class="field" id="postal_code"
          disabled="true"></input></td>
  </tr>
  <tr>
    <td class="label">Country</td>
    <td class="wideField" colspan="3"><input class="field"
          id="country" disabled="true"></input></td>
  </tr>
</table>
<script>
  // This example displays an address form, using the autocomplete feature
  // of the Google Places API to help users fill in the information.
  // This example requires the Places library. Include the libraries=places
  // parameter when you first load the API. For example:
  // <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=places">
  var placeSearch, autocomplete;
  var componentForm = {
    street_number: 'short_name',
    route: 'long_name',
    locality: 'long_name',
    administrative_area_level_1: 'short_name',
    country: 'long_name',
    postal_code: 'short_name'
  };
  function initAutocomplete() {
    // Create the autocomplete object, restricting the search to geographical
    // location types.
    autocomplete = new google.maps.places.Autocomplete(
        /** @type {!HTMLInputElement} */(document.getElementById('autocomplete')),
        {types: ['geocode']});
    // When the user selects an address from the dropdown, populate the address
    // fields in the form.
    autocomplete.addListener('place_changed', fillInAddress);
  }
  function fillInAddress() {
    // Get the place details from the autocomplete object.
    var place = autocomplete.getPlace();
    for (var component in componentForm) {
      document.getElementById(component).value = '';
      document.getElementById(component).disabled = false;
    }
    // Get each component of the address from the place details
    // and fill the corresponding field on the form.
    for (var i = 0; i < place.address_components.length; i++) {
      var addressType = place.address_components[i].types[0];
      if (componentForm[addressType]) {
        var val = place.address_components[i][componentForm[addressType]];
        document.getElementById(addressType).value = val;
      }
    }
  }
  // Bias the autocomplete object to the user's geographical location,
  // as supplied by the browser's 'navigator.geolocation' object.
  function geolocate() {
    if (navigator.geolocation) {
      navigator.geolocation.getCurrentPosition(function(position) {
        var geolocation = {
          lat: position.coords.latitude,
          lng: position.coords.longitude
        };
        var circle = new google.maps.Circle({
          center: geolocation,
          radius: position.coords.accuracy
        });
        autocomplete.setBounds(circle.getBounds());
      });
    }
  }
</script>
<script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=places&callback=initAutocomplete"
    async defer></script>

最简单的选择是使用HTML数据元素。

见:https://developer.mozilla.org/en-US/docs/Web/HTML/Element/datalist

<label>Choose a browser from this list:
<input list="browsers" name="myBrowser" /></label>
<datalist id="browsers">
  <option value="Chrome">
  <option value="Firefox">
  <option value="Internet Explorer">
  <option value="Opera">
  <option value="Safari">
  <option value="Microsoft Edge">
</datalist>

jQuery UI是可用的，如果你想更花哨。

见:https://jqueryui.com/autocomplete/