AngularJS promise not resolving file with FileReader

This question already has an answer here:

How do I convert an existing callback API to promises? 17 answers

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您没有onload事件，因此它实际上不会返回读取的文件数据。

this.fileRead  = function(file) {
    var deferred = $q.defer();

    var reader = new FileReader();

    reader.onload = function() {
        deferred.resolve(reader.result);
    };

    reader.readAsDataURL(file);

    return deferred.promise;
};

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