小程序无法限制文件类型

我把文件改了 node_modules\@dcloudio\uni-ui\lib\uni-file-picker\choose-and-upload-file.js

function chooseAll(opts) {  
    const {  
        count,  
        type,  
        extension  
    } = opts;  
    return new Promise((resolve, reject) => {  
        let chooseFile = uni.chooseFile;  
        if (typeof wx !== 'undefined' &&  
            typeof wx.chooseMessageFile === 'function') {  
            chooseFile = wx.chooseMessageFile;  
        }  
        if (typeof chooseFile !== 'function') {  
            return reject({  
                errMsg: ERR_MSG_FAIL + ' 请指定 type 类型，该平台仅支持选择 image 或 video。',  
            });  
        }  
        chooseFile({  
            type: type,  
            count,  
            extension,  
            success(res) {  
                resolve(normalizeChooseAndUploadFileRes(res));  
            },  
            fail(res) {  
                reject({  
                    errMsg: res.errMsg.replace('chooseFile:fail', ERR_MSG_FAIL),  
                });  
            },  
        });  
    });  
}