js保存图片到手机相册

/保存到相册
function savePic(){         
    var picurl= $("#picurl").attr("src");
    //alert(picurl);
    savePicture(picurl);
}




var triggerEvent = "touchstart";
function savePicture(Url){
    var blob=new Blob([\'\'], {type:\'application/octet-stream\'});
    var url = URL.createObjectURL(blob);
    var a = document.createElement(\'a\');
    a.href = Url;
    a.download = Url.replace(/(.*\/)*([^.]+.*)/ig,"$2").split("?")[0];
    var e = document.createEvent(\'MouseEvents\');
    e.initMouseEvent(\'click\', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
    a.dispatchEvent(e);
    URL.revokeObjectURL(url);
}