jQuery遮罩层效果实例分析

2019-11-20 10:48:08

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本文实例分析了jQuery遮罩层效果。分享给大家供大家参考，具体如下：

先来看看示例代码：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh" lang="zh" dir="ltr"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body><mce:script type="text/javascript" src="jquery-1.4.4.min.js" mce_src="jquery-1.4.4.min.js"></mce:script><title>Example | xHTML1.0</title><mce:style><!--  *{font-family:Arial, Helvetica, sans-serif;font-size:12px;}#full_box{background-color:gray;display:none;z-index:3;position:absolute;left:0px;top:0px;filter:Alpha(Opacity=30);/* IE */-moz-opacity:0.4;/* Moz + FF */opacity: 0.4;}#dialog{position:absolute;width:200px;height:200px;background:#F00;display:none;z-index:5;}--></mce:style><style mce_bogus="1">*{font-family:Arial, Helvetica, sans-serif;font-size:12px;}#full_box{background-color:gray;display:none;z-index:3;position:absolute;left:0px;top:0px;filter:Alpha(Opacity=30);/* IE */-moz-opacity:0.4;/* Moz + FF */opacity: 0.4;}#dialog{position:absolute;width:200px;height:200px;background:#F00;display:none;z-index:5;}</style><mce:script type="text/javascript"><!--function showBox() {var bH = $(window).height();var bW = $(window).width();$("#full_box").css({width:bW,height:bH,display:"block"});var objWH = getObjWh('dialog');var tbT = objWH.split("|")[0] + "px";var tbL = objWH.split("|")[1] + "px";$("#dialog").css({top:tbT,left:tbL,display:"block"});$("#dialog_content").html("<div style="text-align:center" mce_style="text-align:center">正在加载，请稍后...</div>");$(window).scroll(function (){ resetBox();});$(window).resize(function (){ resetBox();});}function resetBox() {var full_box = $("#full_box").css("display");if (full_box == 'block') {var bH = $(window).height();var bW = $(window).width();var objWH = getObjWh('dialog');var tbT = objWH.split("|")[0] + "px";var tbL = objWH.split("|")[1] + "px";$("#dialog").css({top:tbT,left:tbL,display:"block"});}}function getObjWh(obj) {var st = $(window).scrollTop();var sl = $(window).scrollLeft();var ch = $(window).height();var cw = $(window).width();var objH = $("#"+obj).height();var objW = $("#"+obj).width();var objT = Number(st) + (Number(ch) - Number(objH))/2;var objL = Number(sl) + (Number(cw) - Number(objW))/2;return objT +"|" +objL;}function closeBox() {$("#dialog").css("display","none");$("#full_box").css("display","none");}// --></mce:script><button id="click" onclick="showBox()">click</button><div id="full_box"></div><div id="dialog"><div id="dialog_content"></div><div style="text-align:center;" mce_style="text-align:center;"><a href="#" mce_href="#" onclick="closeBox();">关闭</a></div></div></body></html>

其实遮罩层原理很简单。

一个div 遮住下面的内容。

其中比较关键的一个css 样式是

x-index: 整数值

数值越大在越上层，越小就在越下层，可以是负数。

上面的js 代码有部分错误。下面已经修正。

//显示层function showBox(id) {    var bH = document.body.offsetHeight;//$(window).height();    var bW = document.body.offsetWidth;//$(window).width();    if (bH < $(window).height())    {      bH = $(window).height();    }    $("#full_box").css({width:bW,height:bH,display:"block"});    var objWH = getObjWh('dialog');    var tbT = objWH.split("|")[0] + "px";    var tbL = objWH.split("|")[1] + "px";    if(id=='template'){      $("#div_template").show();    }else if(id == 'history'){      $("#div_history").show();    }else{      $("#tree_"+id).show();    }    $(window).scroll(function (){ resetBox(id);});    $(window).resize(function (){ resetBox(id);});}//重置层function resetBox(id) {    var full_box = $("#full_box").css("display");    if (full_box == 'block') {      var bH = document.body.offsetHeight;//$(window).height();      var bW = document.body.offsetWidth;//$(window).width();      if (bH < $(window).height())      {        bH = $(window).height();      }      var objWH = getObjWh('dialog');      var tbT = objWH.split("|")[0] + "px";      var tbL = objWH.split("|")[1] + "px";      $(".dialog").css({top:tbT,left:tbL});      $("#full_box").css({width:bW,height:bH});    }}//获得层参数function getObjWh(obj) {    var st = $(window).scrollTop();    var sl = $(window).scrollLeft();    var ch = $(window).height();    var cw = $(window).width();    var objH = $("#"+obj).height();    var objW = $("#"+obj).width();    var objT = Number(st) + (Number(ch) - Number(objH))/2;    var objL = Number(sl) + (Number(cw) - Number(objW))/2;    return objT +"|" +objL;}//关闭层function closeBox(id) {    if(id == 'template'){       $("#div_template").hide();    }else if(id == 'history'){      $("#div_history").hide();    }else{      $("#tree_"+id).hide();    }    $("#full_box").hide();}

更多关于jQuery特效相关内容感兴趣的读者可查看本站专题：《jQuery常见经典特效汇总》

希望本文所述对大家jQuery程序设计有所帮助。

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