Function getImgCache

apps/json-format/format-lib.js:1479–1483

()

        let $imgPreview = null;
        // 加载缓存
        function getImgCache() {
            try {
                return JSON.parse(sessionStorage.getItem('fehelper-img-preview-cache') || '{}');
            } catch (e) { return {}; }
        }
        function setImgCache(url, isImg) {
            let cache = getImgCache();
            cache[url] = isImg;