前台下載文件（使用blob）

 var funDownload = function (content: any, filename: any) {
            // 創建隱藏的可下載鏈接
            var eleLink = document.createElement('a');
            eleLink.download = filename;
            eleLink.style.display = 'none';
            // 字符內容轉變成blob地址
            var blob = new Blob([content]);
            eleLink.href = URL.createObjectURL(blob);
            // 觸發點擊
            document.body.appendChild(eleLink);
            eleLink.click();
            // 然后移除
            document.body.removeChild(eleLink);
        };
        funDownload(content, name + '.html');