测试

document.oncontextmenu = reEnable;

$("#iframepage").prop('contentWindow').document.oncontextmenu=reEnable;

if (typeof document.onselectstart != "undefined"){

    document.onselectstart =reEnable;

    $("#iframepage").prop('contentWindow').document.onselectstart =reEnable;

}else {

    document.onmousedown = reEnable;

    $("#iframepage").prop('contentWindow').document.onmousedown = reEnable;

}