Google Maps API - 这条线的含义/功能是什么？

Question

我在我的Google地图中添加了一个搜索框。从文档（https://developers.google.com/maps/documentation/javascript/examples/places-searchbox）：

// Create the search box and link it to the UI element.
var input = document.getElementById('pac-input');
var searchBox = new google.maps.places.SearchBox(input);
map.controls[google.maps.ControlPosition.TOP_LEFT].push(input);

我试图准确地理解它在低级别上是如何工作的。 最后一行有什么作用？如果它在评论中将搜索框链接到UI元素，它是如何做到的？

Answer 1

如https://developers.google.com/maps/documentation/javascript/controls#CustomExample

所述

// Add the control to the map at a designated control position
// by pushing it on the position's array. This code will
// implicitly add the control to the DOM, through the Map
// object. You should not attach the control manually.
map.controls[google.maps.ControlPosition.TOP_RIGHT].push(controlDiv);