JavaScript 仿LightBox內容顯示效果 創建個LightBox.htm文件粘進去，直接查看效果

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="https://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>JavaScript 仿LightBox內容顯示效果</title>
</head>

<body>

<br /><br /><br /><br />

 

<script>

var isIE = (document.all) ? true : false;

var isIE6 = isIE && ([/MSIE (\d)\.0/i.exec(navigator.userAgent)][0][1] == 6);

var $ = function (id) {
    return "string" == typeof id ? document.getElementById(id) : id;
};

var Class = {
    create: function() {
        return function() { this.initialize.apply(this, arguments); }
    }
}

var Extend = function(destination, source) {
    for (var property in source) {
        destination[property] = source[property];
    }
}

var Bind = function(object, fun) {
    return function() {
        return fun.apply(object, arguments);
    }
}

var Each = function(list, fun){
    for (var i = 0, len = list.length; i < len; i++) { fun(list[i], i); }
};

var Contains = function(a, b){
    return a.contains ? a != b && a.contains(b) : !!(a.compareDocumentPosition(b) & 16);
}

var OverLay = Class.create();
OverLay.prototype = {
  initialize: function(options) {

    this.SetOptions(options);
   
    this.Lay = $(this.options.Lay) || document.body.insertBefore(document.createElement("p"), document.body.childNodes[0]);
   
    this.Color = this.options.Color;
    this.Opacity = parseInt(this.options.Opacity);
    this.zIndex = parseInt(this.options.zIndex);
   
    with(this.Lay.style){ display = "none"; zIndex = this.zIndex; left = top = 0; position = "fixed"; width = height = "100%"; }
   
    if(isIE6){
        this.Lay.style.position = "absolute";
        //ie6設置覆蓋層大小程序
        this._resize = Bind(this, function(){
            this.Lay.style.width = Math.max(document.documentElement.scrollWidth, document.documentElement.clientWidth) + "px";
            this.Lay.style.height = Math.max(document.documentElement.scrollHeight, document.documentElement.clientHeight) + "px";
        });
        //遮蓋select
        this.Lay.innerHTML = '<iframe style="position:absolute;top:0;left:0;width:100%;height:100%;filter:alpha(opacity=0);"></iframe>'
    }
  },
  //設置默認屬性
  SetOptions: function(options) {
    this.options = {//默認值
        Lay:        null,//覆蓋層對象
        Color:        "#fff",//背景色
        Opacity:    50,//透明度(0-100)
        zIndex:        1000//層疊順序
    };
    Extend(this.options, options || {});
  },
  //顯示
  Show: function() {
    //兼容ie6
    if(isIE6){ this._resize(); window.attachEvent("onresize", this._resize); }
    //設置樣式
    with(this.Lay.style){
        //設置透明度
        isIE ? filter = "alpha(opacity:" + this.Opacity + ")" : opacity = this.Opacity / 100;
        backgroundColor = this.Color; display = "block";
    }
  },
  //關閉
  Close: function() {
    this.Lay.style.display = "none";
    if(isIE6){ window.detachEvent("onresize", this._resize); }
  }
};

 

var LightBox = Class.create();
LightBox.prototype = {
  initialize: function(box, options) {
   
    this.Box = $(box);//顯示層
   
    this.OverLay = new OverLay(options);//覆蓋層
   
    this.SetOptions(options);
   
    this.Fixed = !!this.options.Fixed;
    this.Over = !!this.options.Over;
    this.Center = !!this.options.Center;
    this.onShow = this.options.onShow;
   
    this.Box.style.zIndex = this.OverLay.zIndex + 1;
    this.Box.style.display = "none";
   
    //兼容ie6用的屬性
    if(isIE6){
        this._top = this._left = 0; this._select = [];
        this._fixed = Bind(this, function(){ this.Center ? this.SetCenter() : this.SetFixed(); });
    }
  },
  //設置默認屬性
  SetOptions: function(options) {
    this.options = {//默認值
        Over:    true,//是否顯示覆蓋層
        Fixed:    false,//是否固定定位
        Center:    false,//是否居中
        onShow:    function(){}//顯示時執行
    };
    Extend(this.options, options || {});
  },
  //兼容ie6的固定定位程序
  SetFixed: function(){
    this.Box.style.top = document.documentElement.scrollTop – this._top + this.Box.offsetTop + "px";
    this.Box.style.left = document.documentElement.scrollLeft – this._left + this.Box.offsetLeft + "px";
   
    this._top = document.documentElement.scrollTop; this._left = document.documentElement.scrollLeft;
  },
  //兼容ie6的居中定位程序
  SetCenter: function(){
    this.Box.style.marginTop = document.documentElement.scrollTop – this.Box.offsetHeight / 2 + "px";
    this.Box.style.marginLeft = document.documentElement.scrollLeft – this.Box.offsetWidth / 2 + "px";
  },
  //顯示
  Show: function(options) {
    //固定定位
    this.Box.style.position = this.Fixed && !isIE6 ? "fixed" : "absolute";

    //覆蓋層
    this.Over && this.OverLay.Show();
   
    this.Box.style.display = "block";
   
    //居中
    if(this.Center){
        this.Box.style.top = this.Box.style.left = "50%";
        //設置margin
        if(this.Fixed){
            this.Box.style.marginTop = – this.Box.offsetHeight / 2 + "px";
            this.Box.style.marginLeft = – this.Box.offsetWidth / 2 + "px";
        }else{
            this.SetCenter();
        }
    }
   
    //兼容ie6
    if(isIE6){
        if(!this.Over){
            //沒有覆蓋層ie6需要把不在Box上的select隱藏
            this._select.length = 0;
            Each(document.getElementsByTagName("select"), Bind(this, function(o){
                if(!Contains(this.Box, o)){ o.style.visibility = "hidden"; this._select.push(o); }
            }))
        }
        //設置顯示位置
        this.Center ? this.SetCenter() : this.Fixed && this.SetFixed();
        //設置定位
        this.Fixed && window.attachEvent("onscroll", this._fixed);
    }
   
    this.onShow();
  },
  //關閉
  Close: function() {
    this.Box.style.display = "none";
    this.OverLay.Close();
    if(isIE6){
        window.detachEvent("onscroll", this._fixed);
        Each(this._select, function(o){ o.style.visibility = "visible"; });
    }
  }
};

</script>

<style>
.lightbox{width:300px;background:#FFFFFF;border:1px solid #ccc;line-height:25px; top:20%; left:20%;}
.lightbox dt{background:#f4f4f4; padding:5px;}
</style>

<dl id="idBox" class="lightbox">
  <dt id="idBoxHead"><b>LightBox</b> </dt>
  <dd>
    內容顯示
    <br /><br />
    <input name="" type="button" value=" 關閉 " id="idBoxCancel" />
    <br /><br />
  </dd>
</dl>

<p style="margin:0 auto; width:900px; height:1000px; border:1px solid #000000;">

<input type="button" value="關閉覆蓋層" id="btnOverlay" />
<input type="button" value="黑色覆蓋層" id="btnOverColor" />
<input type="button" value="全透覆蓋層" id="btnOverOpacity" />
<input type="button" value="定位效果" id="btnFixed" />
<input type="button" value="居中效果" id="btnCenter" />
<br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />
<select>
<option>覆蓋select測試</option>
</select>
<input name="" type="button" value=" 打開 " id="idBoxOpen" />

</p>

 

<script>

var box = new LightBox("idBox");

$("idBoxCancel").onclick = function(){ box.Close(); }
$("idBoxOpen").onclick = function(){ box.Show(); }

$("btnOverlay").onclick = function(){
    box.Close();
    if(box.Over){
        box.Over = false;
        this.value = "打開覆蓋層";
    } else {
        box.Over = true;
        this.value = "關閉覆蓋層";
    }
}

$("btnOverColor").onclick = function(){
    box.Close();
    box.Over = true;
    if(box.OverLay.Color == "#fff"){
        box.OverLay.Color = "#000";
        this.value = "白色覆蓋層";
    } else {
        box.OverLay.Color = "#fff"
        this.value = "黑色覆蓋層";
    }
}

$("btnOverOpacity").onclick = function(){
    box.Close();
    box.Over = true;
    if(box.OverLay.Opacity == 0){
        box.OverLay.Opacity = 50;
        this.value = "全透覆蓋層";
    } else {
        box.OverLay.Opacity = 0;
        this.value = "半透覆蓋層";
    }
}

$("btnFixed").onclick = function(){
    box.Close();
    if(box.Fixed){
        box.Fixed = false;
        this.value = "定位效果";
    } else {
        box.Fixed = true;
        this.value = "取消定位";
    }  www.aiwalls.com
}

$("btnCenter").onclick = function(){
    box.Close();
    if(box.Center){
        box.Center = false;
        box.Box.style.left = box.Box.style.top = "20%";
        box.Box.style.marginTop = box.Box.style.marginLeft = "0";
        this.value = "居中效果";
    } else {
        box.Center = true;
        this.value = "重新定位";
    }
}
</script>

</body>
</html>

 

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