如何从 Javascript 中的图像文件数据中读取地理位置

Question

How to read geolocation data from an image file (JPG, JPEG, PNG, etc) in Javascript at the moment of loading the file onto web browser but before the actual upload (on the client side).

Answer 1

There is a module called exif you could use like this:

var ExifImage = require('exif').ExifImage;

try {
    new ExifImage({ image : 'myImage.jpg' }, function (error, exifData) {
        if (error)
            console.log('Error: '+error.message);
        else
            console.log(exifData); // Do something with your data!
    });
} catch (error) {
    console.log('Error: ' + error.message);
}

You can use Browserify to convert this npm module for use in the browser.