var delay = 1000;

function del() {

    if (document.querySelector(".app_canvas_frame").contentDocument.querySelector(".del_btn")) {

        document.querySelector(".app_canvas_frame").contentDocument.querySelector(".del_btn").click();

        setTimeout("yes()", delay)

    } else {

        document.querySelector(".app_canvas_frame").contentDocument.querySelectorAll(".bt_tx2")[1].click();

        setTimeout("del()", delay)

    }

}

function yes() {

    document.querySelector(".qz_dialog_layer_btn").click();

    setTimeout("del()", delay)

}

del();