覆盖CSS+；Javascript

我开始在javascript和css。。。我想做一个简单的div，看起来像一个对话框，但我希望后面有一个黑屏和对话框模式，阻止用户单击div以外的地方。。我在谷歌上搜索过，但我正在学习，我想知道覆盖图缺少什么…有人能帮我吗

我的css：

.insertscreen{
visibility: hidden;
position: absolute;
left: 25%;
top: 25%;

border:2px solid #0094ff;
width: 50%;
height: 50%;

-webkit-border-top-left-radius:6px;
-webkit-border-top-right-radius:6px;
-moz-border-radius-topleft:6px;
-moz-border-radius-topright:6px;
border-top-left-radius:6px;
border-top-right-radius:6px;
font-size:12pt; /* or whatever */
background: -webkit-linear-gradient(top,#ffffff 0,#F2F2F2 100%);
background: -moz-linear-gradient(top,#ffffff 0,#F2F2F2 100%);
background: -o-linear-gradient(top,#ffffff 0,#F2F2F2 100%);
background: linear-gradient(to bottom,#ffffff 0,#F2F2F2 100%);
background-repeat: repeat-x;
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=#ffffff,endColorstr=#F2F2F2,GradientType=0);

---

}试试这个简单的例子

HTML:

JS

---

我将您的CSS类插入到JSFIDLE中，并在后台创建了一个新的CSS类。看看吧。 你说你是Javascript新手，所以我没有包括JQuery或复杂的编码

HTML（3个分区）：

忘了小提琴的链接

<div id="modal">
    <div class="insertscreen">
        <p class="close">Close this modal</p>
    </div>
</div>
<div id="showmodal">SHOW MY MODAL</div>

* { 
    padding: 0; margin: 0; 
}

html, body, #fullheight {
    min-height: 100% !important;
    height: 100%;
}
#modal{
    display:none;
    position:fixed;
    top:0;
    left:0;
    width:100%;
    height:100%;
    background-color:rgba(0, 0, 0, 0.5);
}
#modal .insertscreen{
    position:relative;
left: 25%;
top: 25%;

border:2px solid #0094ff;
width: 50%;
height: 50%;

-webkit-border-top-left-radius:6px;
-webkit-border-top-right-radius:6px;
-moz-border-radius-topleft:6px;
-moz-border-radius-topright:6px;
border-top-left-radius:6px;
border-top-right-radius:6px;
font-size:12pt; /* or whatever */
background: -webkit-linear-gradient(top,#ffffff 0,#F2F2F2 100%);
background: -moz-linear-gradient(top,#ffffff 0,#F2F2F2 100%);
background: -o-linear-gradient(top,#ffffff 0,#F2F2F2 100%);
background: linear-gradient(to bottom,#ffffff 0,#F2F2F2 100%);
background-repeat: repeat-x;
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=#ffffff,endColorstr=#F2F2F2,GradientType=0);  
}

$('#showmodal').click(function(){
    $('#modal').show();
});
$('.close').click(function(){
    $('#modal').hide();
});

<div> You can not select me!</div>
<div id="blockbg" class="freeze"></div>
<div id="messageboard" class="insertscreen">Test</div>

.freeze {
    visibility: show;
    opacity: 0.5;
    top: 0;
    left: 0;
    background-color: grey;
    position: absolute;
    min-width: 100%;
    min-height: 100%
}
.insertscreen {
    visibility: show;
    position: absolute;
    left: 25%;
    top: 25%;
    border:2px solid #0094ff;
    width: 50%;
    height: 50%;
    -webkit-border-top-left-radius:6px;
    -webkit-border-top-right-radius:6px;
    -moz-border-radius-topleft:6px;
    -moz-border-radius-topright:6px;
    border-top-left-radius:6px;
    border-top-right-radius:6px;
    font-size:12pt;
    /* or whatever */
    background: -webkit-linear-gradient(top, #ffffff 0, #F2F2F2 100%);
    background: -moz-linear-gradient(top, #ffffff 0, #F2F2F2 100%);
    background: -o-linear-gradient(top, #ffffff 0, #F2F2F2 100%);
    background: linear-gradient(to bottom, #ffffff 0, #F2F2F2 100%);
    background-repeat: repeat-x;
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=#ffffff, endColorstr=#F2F2F2, GradientType=0);
}