我不明白为什么setTimeout无法正常工作。
我想将每个标记放到不同的时间,而不是同时放下。
将此代码粘贴并运行到http://jsfiddle.net中,然后删除注释以查看有趣的行为:
//setTimeout(function() {
addMarker(m);
//}, i * 500);
。
<link href="http://code.google.com/apis/maps/documentation/javascript/examples/default.css" rel="stylesheet" type="text/css" />
<script type="text/javascript" src="//maps.googleapis.com/maps/api/js?sensor=false"></script>
<script type="text/javascript">
var berlin = new google.maps.LatLng(52.520816, 13.410186);
var neighborhoods = [
new google.maps.LatLng(52.511467, 13.447179),
new google.maps.LatLng(52.549061, 13.422975),
new google.maps.LatLng(52.497622, 13.396110),
new google.maps.LatLng(52.517683, 13.394393)
];
var map;
function initialize() {
var mapOptions = {
zoom: 12,
mapTypeId: google.maps.MapTypeId.ROADMAP,
center: berlin
};
map = new google.maps.Map(document.getElementById("map_canvas"),mapOptions);
}
function drop() {
var j = 0;
for (var i = 0; i < neighborhoods.length; i++) {
var m = neighborhoods[i];
//setTimeout(function() {
addMarker(m);
//}, i * 500);
}
}
function addMarker(m) {
new google.maps.Marker({
position: m,
map: map,
draggable: false,
animation: google.maps.Animation.DROP
});
}
</script>
<body onload="initialize()">
<div id="map_canvas" style="width: 500px; height: 400px;">map div</div>
<button id="drop" onclick="drop()">Drop Markers</button>
</body>
最佳答案
这是因为'm'的值在timeOut事件触发之前很久就已更改。
您应该将此代码包装在闭包中,以捕获m的值。
就像是:
for (var i = 0; i < neighborhoods.length; i++) {
var m = neighborhoods[i];
(function(n){
setTimeout(function() {
addMarker(n);
}, i * 500);
}(m));
}
关于javascript - setTimeout()并在Google map 上放置标记,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/9294740/