plus.io.resolveLocalFileSystemURL 没有返回信息，不提示成功还是失败

getbase64FromImage(path) {
plus.io.resolveLocalFileSystemURL(path, function(entry) {
// 可通过entry对象操作test.html文件
entry.file(function(file) {
var fileReader = new plus.io.FileReader();
alert("getFile:" + JSON.stringify(file));
fileReader.readAsText(file, 'utf-8');
fileReader.onloadend = function(evt) {
alert("11" + evt);
alert("evt.target" + evt.target);
alert(evt.target.result);
}
alert(file.size + '--' + file.name);
});
}, function(e) {
alert("Resolve file URL failed: " + e.message);
});
},
getPhoto() {
var that = this
uni.chooseImage({
count: 1,
complete() {

                },  
                success: function(res) {  

                    var imagePath = JSON.stringify(res.tempFilePaths)  
                    console.log(imagePath)  
                    that.getbase64FromImage(imagePath)  

                }  
            })  
        },