如何在函数WinJS中返回var

Question

我对此感到厌倦，请帮忙

function fileProperties(image){
    image.properties.getImagePropertiesAsync().then(function (chiTiet) {
        var imgWidth = chiTiet.width;
        var imgHeight = chiTiet.height;
        var imgBlob = URL.createObjectURL(image, { oneTimeOnly: true });
        var data = imgWidth + imgHeight + imgBlob;
        return data;
    });
}

这不行。我如何返回var数据？

Answer 1

function fileProperties(image){
    return image.properties.getImagePropertiesAsync().then(function (chiTiet) {
        var imgWidth = chiTiet.width;
        var imgHeight = chiTiet.height;
        var imgBlob = URL.createObjectURL(image, { oneTimeOnly: true });
        var data = imgWidth + imgHeight + imgBlob;
        return {
            width: imgWidth,
            height: imgHeight,
            blob: imgBlob
        };
    });
}

在您的代码中使用它：

fileProperties(myImage).then(function(properties) {
    console.log('Image width: ', properties.width);
    console.log('Image height: ', properties.height);
    console.log('Image blob: ', properties.blob);
});