使用Javascript，如何随机偏移经度和纬度数字

Question

I have an array of Longitude/Latitude numbers that I loop through to spit out markers for a Google Map. The markers I am using are circles to show a small area. I am trying to "slightly" privatize the locations by offsetting the numbers by a small amount. I am thinking fluctuations of +/- 0.001 to 0.009.

An example is: lat: 47.6204674, lng -122.3491156.

My current loop:

    $.each(locations, function(i, item) {
        // init markers
         var marker = new google.maps.Marker({
             position: new google.maps.LatLng(item.lat, item.lng),
             map: map,
            icon: circleIcon
         });
    });

I need to modify item.lat and item.lng

thanks

Answer 1

Adding in a random number in the range you suggest would work OK,

 position: new google.maps.LatLng(
        item.lat + ((Math.random() > 0.5 ? 0.001 : -0.009) + Math.random() * 0.008), 
        item.lng ...),

But for added anonymity, you might want to seed the random number generator based on the user ID. Otherwise some hacker could invoke your code N times, take the average, and accurately work out the position.