function downloadFile(fileName, content){     var aLink = document.createElement('a');     var blob = new Blob([content]);     var evt = document.createEvent("HTMLEvents");     evt.initEvent("click", false, false);//initEvent 不加后两个参数在FF下会报错, 感谢 Barret Lee 的反馈     aLink.download = fileName;     aLink.href = URL.createObjectURL(blob);     aLink.dispatchEvent(evt); }