Question

我只是在第一次点击时尝试执行下面的点击（功能），但每当我点击地图时它总会执行。是否可以使用以下代码单击？提前致谢

var placedMarkers = 0;
var availableMarkersToPlace = 1;
setTimeout( function(){
    if(placedMarkers >= availableMarkersToPlace)
         return;
    placedMarkers++;
    var map = Appery("google_map").gmap;
    google.maps.event.addListener(map, 'click', function(event) { 
       localStorage.setItem('selectedLat', event.latLng.lat());
localStorage.setItem('selectedLng', event.latLng.lng()); 
        placeMarker(event.latLng,map);  
        alert(event.latLng);
    });

}, 1000);

Answer 1

使用addListenerOnce

google.maps.event.addListenerOnce(map, 'click', function(event) { 
   localStorage.setItem('selectedLat', event.latLng.lat());
   localStorage.setItem('selectedLng', event.latLng.lng()); 
    placeMarker(event.latLng,map);  
    alert(event.latLng);
});

Answer 2

只需创建一个标志值，它将决定，运行你的函数或跳过：

var placedMarkers = 0;
var availableMarkersToPlace = 1;
var clicked = false;

setTimeout( function(){
    if(placedMarkers >= availableMarkersToPlace)
        return;
    placedMarkers++;
    var map = Appery("google_map").gmap;
    google.maps.event.addListener(map, 'click', function(event) { 
        if(!clicked) {
            clicked = true;
            localStorage.setItem('selectedLat', event.latLng.lat());
            localStorage.setItem('selectedLng', event.latLng.lng()); 
            placeMarker(event.latLng,map);  
            alert(event.latLng);            
        }

    });

}, 1000);

仅在第一次单击时执行事件

2 个答案: