function del() {
document.getElementsByClassName('app_canvas_frame')[0].contentWindow.document.getElementById('chkSelectAll').click();
document.getElementsByClassName('app_canvas_frame')[0].contentWindow.document.getElementById('btnDeleteBatchBottom').click();
setTimeout("yes()", 3000);
}
function yes(){
document.getElementsByClassName('qz_dialog_layer_btn')[0].click();
setTimeout("del()", 3200);
}
if(confirm("你将失去你留言板的所有留言，所有留言将不可恢复 !!!\n\n你确定要这样做吗？")){
document.getElementsByClassName('app_canvas_frame')[0].contentDocument.getElementById('btnBatchBottom').click();
del();
}
