遮罩层屏幕禁止滚动

禁止滚动：

$("body").css({
    "overflow-x":"hidden",
    "overflow-y":"hidden"
});

启用：

$("body").css({
    "overflow-x":"auto",
    "overflow-y":"auto"
});

全屏的遮罩层函数：

修改之后的，参数可传可不传

function MB(text,time) {
    if(text==undefined&&time==undefined){
        var MB = $("<div id='divvv' style='position: absolute;top:0;left:0;right:0;bottom:0;background: #eee;color:#000;opacity: 0.7;z-index: 100;text-align: center;'><p style='position: fixed;' class='Mengban_p'><img src='loading.gif' style='width:20px;'/>加载中...</p></div>");
    }else if(time!==undefined){
        var MB = $("<div id='divvv' style='position: absolute;top:0;left:0;right:0;bottom:0;background: #eee;color:#000;opacity: 0.7;z-index: 100;text-align: center;'><p style='position: fixed;' class='Mengban_p'><img src='loading.gif' style='width:20px;'/>"+text+"</p></div>");
        setTimeout(
            function () {
                $("#divvv").remove();
                $("body").css({
                    "overflow-x":"auto",
                    "overflow-y":"auto"
                });
            },time);
    }else{
        var MB = $("<div id='divvv' style='position: absolute;top:0;left:0;right:0;bottom:0;background: #eee;color:#000;opacity: 0.7;z-index: 100;text-align: center;'><p style='position: fixed;' class='Mengban_p'><img src='loading.gif' style='width:20px;'/>"+text+"</p></div>");
    }

    $("body").css({
        "overflow-x":"hidden",
        "overflow-y":"hidden"
    });
    $("body").append(MB);
    /*if(time!==""){

     }*/

    var top1=$(window).height();
    var left1=$(window).width();
    $("#divvv").css({
        height: function () {
            return $(document).height();
        },
        width:"100%"
    });
    $(".Mengban_p").css("top",top1/2-20+"px");
    $(".Mengban_p").css("left",left1/2-20+"px");
    $(window).resize(function(){
        var height1=$(window).height();
        $(".Mengban_p").css("margin-top",height1/2+"px");
    });
}
$("#submit_btn").click(function () {
 MB("hhhhh",5000);
 });
function HideMB(){
    $("#divvv").remove();
    $("body").css({
        "overflow-x":"auto",
        "overflow-y":"auto"
    });
}
/*
$("#submit_btn").click(function () {
    MB();
    setTimeout(function () {
        HideMB();
    },3000);
});*/