vant-weapp/dist/uploader/utils.js

const IMAGE_EXT = ['jpeg', 'jpg', 'gif', 'png', 'svg', 'webp'];
export function isImageUrl(url) {
    return IMAGE_EXT.some(ext => url.indexOf(`.${ext}`) !== -1 || url.indexOf(`.${ext.toLocaleUpperCase()}`) !== -1); // 有些七牛返回来的后缀的大写，加以判断
}
export function isImageFile(item) {
    if (item.type) {
        return item.type.indexOf('image') === 0;
    }
    if (item.path) {
        return isImageUrl(item.path);
    }
    if (item.url) {
        return isImageUrl(item.url);
    }
    return false;
}
export function isVideo(res, accept) {
    return accept === 'video';
}
export function chooseFile({ accept, multiple, capture, compressed, maxDuration, sizeType, camera, maxCount }) {
    if (accept === 'image') {
        return new Promise((resolve, reject) => {
            wx.chooseImage({
                count: multiple ? Math.min(maxCount, 9) : 1,
                sourceType: capture,
                sizeType,
                success: resolve,
                fail: reject
            });
        });
    }
    if (accept === 'video') {
        return new Promise((resolve, reject) => {
            wx.chooseVideo({
                sourceType: capture,
                compressed,
                maxDuration,
                camera,
                success: resolve,
                fail: reject
            });
        });
    }
    return new Promise((resolve, reject) => {
        wx.chooseMessageFile({
            count: multiple ? maxCount : 1,
            type: 'file',
            success: resolve,
            fail: reject
        });
    });
}
export function isFunction(val) {
    return typeof val === 'function';
}
export function isObject(val) {
    return val !== null && typeof val === 'object';
}
export function isPromise(val) {
    return isObject(val) && isFunction(val.then) && isFunction(val.catch);
}