本文实例讲述了jQuery实现的自定义弹出层效果。分享给大家供大家参考，具体如下：

dialog.css：

#DialogBySHFLayer { width:100%; height:100%; left:0; top:0; position:fixed; z-index:500; background-color:#333333; filter:alpha(Opacity=40); -moz-opacity:0.4; opacity: 0.4; } /*弹出的提示框*/ #DialogBySHF { position:absolute; border-radius:3px; box-shadow:0 0 8px rgba(0, 0, 0, .8); background-color:#f2f2f2; z-index:600; } #DialogBySHF #Title { margin:0; width:100%; height:35px; background-color:#ffa500; color:#FFFFFF; font-family: 'microsoft yahei'; font-size:18px; text-align:center; cursor:move; line-height:35px; border-radius:3px 3px 0 0; -moz-user-select:none; -webkit-user-select:none; user-select:none; } #DialogBySHF #Close { position:absolute; right:7px; top:6px; height:21px; line-height:21px; width:21px; cursor:pointer; display:block; border:1px solid #da8e02; box-shadow:0 0 4px rgba(255, 255, 255, .9); border-radius:3px; } #DialogBySHF #Container { padding:0px 5px 5px 5px; /*width:390px; height:355px;*/ } #DialogBySHF #Container table,#DialogBySHF #Container iframe { width:100%; height:100%; } #DialogBySHF #Container table td { vertical-align:middle; } #DialogBySHF #Container table #TipLine { padding:0 30px; font-family: 'microsoft yahei'; } #DialogBySHF #Container table #BtnLine { height:60px; text-align:center; } #DialogBySHF #Container table #BtnLine input { margin:6px 11px; -moz-user-select: none; background-color:#F5F5F5; background-image: -moz-linear-gradient(center top , #F5F5F5, #F1F1F1); background-image:-ms-linear-gradient(rgb(245, 245, 245), rgb(241, 241, 241)); background-image:-webkit-linear-gradient(top,#f8f8f8,#f1f1f1); border:1px solid rgba(0,0,0,0.1); *border:1px solid #DDDDDD; border:1px solid #DDDDDD; border-radius:2px; font-family: 'microsoft yahei'; color:#666666; cursor:default; font-size:12px; font-weight:bold; height:29px; line-height:27px; min-width:54px; padding:0 8px; text-align:center; } #DialogBySHF #Container table #BtnLine input:hover { background-color: #F8F8F8; background-image: -moz-linear-gradient(center top , #F8F8F8, #F1F1F1); border: 1px solid #C6C6C6; box-shadow: 0 1px 1px rgba(0, 0, 0, 0.1); color: #333333; } #DialogBySHF #Container table #BtnLine input:focus { border: 1px solid #4D90FE; outline: medium none; }

dialog.js：

;(function ($) { //默认参数 var PARAMS; var DEFAULTPARAMS = { Title: "弹出层的标题", Content: "", Width: 400, Height: 300, URL: "", ConfirmFun: new Object, CancelFun: new Object }; var ContentWidth = 0; var ContentHeight = 0; $.DialogBySHF = { //弹出提示框 Alert: function (params) { Show(params, "Alert"); }, //弹出确认框 Confirm: function (params) { Show(params, "Confirm"); }, //弹出引用其他URL框 Dialog: function (params) { Show(params, "Dialog") }, //关闭弹出框 Close: function () { $("#DialogBySHFLayer,#DialogBySHF").remove(); } }; //初始化参数 function Init(params) { if (params != undefined && params != null) { PARAMS = $.extend({},DEFAULTPARAMS, params); } ContentWidth = PARAMS.Width - 10; ContentHeight = PARAMS.Height - 40; }; //显示弹出框 function Show(params, caller) { Init(params); var screenWidth = $(window).width(); var screenHeight = $(window).height(); //在屏幕中显示的位置（正中间） var positionLeft = (screenWidth - PARAMS.Width) / 2 + $(document).scrollLeft(); var positionTop = (screenHeight - PARAMS.Height) / 2 + $(document).scrollTop(); var Content = []; Content.push("<div id="DialogBySHFLayer"></div>"); Content.push("<div id="DialogBySHF" + PARAMS.Width + "px;height:" + PARAMS.Height + "px;left:" + positionLeft + "px;top:" + positionTop + "px;">"); Content.push(" <div id="Title"><span>" + PARAMS.Title + "</span><span id="Close">✕</span></div>"); Content.push(" <div id="Container" + ContentWidth + "px;height:" + ContentHeight + "px;">"); if (caller == "Dialog") { Content.push("<iframe frameborder="0" marginwidth="0" marginheight="0" src="" + PARAMS.URL + "" ></iframe>"); } else { var TipLineHeight = ContentHeight - 60; Content.push(" <table>"); Content.push(" <tr><td id="TipLine" + TipLineHeight + "px;">" + PARAMS.Content + "</td></tr>"); Content.push(" <tr>"); Content.push(" <td id="BtnLine">"); Content.push(" <input type="button" id="btnDialogBySHFConfirm" value="确定" />"); if (caller == "Confirm") { Content.push(" <input type="button" id="btnDialogBySHFCancel" value="取消" />"); } Content.push(" </td>"); Content.push(" </tr>"); Content.push(" </table>"); } Content.push(" </div>"); Content.push("</div>"); $("body").append(Content.join("n")); SetDialogEvent(caller); } //设置弹窗事件 function SetDialogEvent(caller) { //添加按钮关闭事件 $("#DialogBySHF #Close").click(function () { $.DialogBySHF.Close();}); //添加ESC关闭事件 $(window).keydown(function(event){ var event = event||window.event; if(event.keyCode===27){ $.DialogBySHF.Close(); } }); //添加窗口resize时调整对话框位置 $(window).resize(function(){ var screenWidth = $(window).width(); var screenHeight = $(window).height(); var positionLeft = parseInt((screenWidth - PARAMS.Width) / 2+ $(document).scrollLeft()); var positionTop = parseInt((screenHeight - PARAMS.Height) / 2+ $(document).scrollTop()); $("#DialogBySHF").css({"top":positionTop+"px","left":positionLeft+"px"}); }); $("#DialogBySHF #Title").DragBySHF($("#DialogBySHF")); if (caller != "Dialog") { $("#DialogBySHF #btnDialogBySHFConfirm").click(function () { $.DialogBySHF.Close(); if ($.isFunction(PARAMS.ConfirmFun)) { PARAMS.ConfirmFun(); } }) } if (caller == "Confirm") { $("#DialogBySHF #btnDialogBySHFCancel").click(function () { $.DialogBySHF.Close(); if ($.isFunction(PARAMS.CancelFun)) { PARAMS.CancelFun(); } }) } } })(jQuery); //拖动层 (function ($) { $.fn.extend({ DragBySHF: function (objMoved) { return this.each(function () { //鼠标按下时的位置 var mouseDownPosiX; var mouseDownPosiY; //移动的对象的初始位置 var objPosiX; var objPosiY; //移动的对象 var obj = $(objMoved) == undefined ? $(this) : $(objMoved); //是否处于移动状态 var status = false; //鼠标移动时计算移动的位置 var tempX; var tempY; $(this).mousedown(function (e) { status = true; mouseDownPosiX = e.pageX; mouseDownPosiY = e.pageY; objPosiX = obj.css("left").replace("px", ""); objPosiY = obj.css("top").replace("px", ""); }).mouseup(function () { status = false; }); $("body").mousemove(function (e) { if (status) { tempX = parseInt(e.pageX) - parseInt(mouseDownPosiX) + parseInt(objPosiX); tempY = parseInt(e.pageY) - parseInt(mouseDownPosiY) + parseInt(objPosiY); obj.css({ "left": tempX + "px", "top": tempY + "px" }); } //判断是否超出窗体 //计算出弹出层距离右边的位置 var dialogRight = parseInt($(window).width())-(parseInt(obj.css("left"))+parseInt(obj.width())); //计算出弹出层距离底边的位置 var dialogBottom = parseInt($(window).height())-(parseInt(obj.css("top"))+parseInt(obj.height())); var maxLeft = $(window).width()-obj.width(); var maxTop = $(window).height()-obj.height(); if(parseInt(obj.css("left"))<=0){ obj.css("left","0px"); } if(parseInt(obj.css("top"))<=0){ obj.css("top","0px"); } if(dialogRight<=0){ obj.css("left",maxLeft+'px'); } }).mouseup(function () { status = false; }).mouseleave(function () { status = false; }); }); } }) })(jQuery);

demo.html：

<!DOCTYPE html> <html lang="zh-cn"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1,maximum-scale=1, user-scalable=no"> <title>新建H5模板</title> <link rel="stylesheet" href="css/dialog.css" /> <style> input[type="button"] { margin: 100px 20px; padding: 10px; } </style> <script type="text/javascript" src="js/jquery-1.10.1.min.js"></script> <script type="text/javascript" src="js/dialog.js"></script> </head> <body> <center> <input type="button" value="弹出提示框" id="btnAlert" /> <input type="button" value="弹出确认框" id="btnConfirm" /> <input type="button" value="弹出iframe" id="btnDialog" /> </center> <script type="text/javascript"> $(function() { $("#btnAlert").click(function() { $.DialogBySHF.Alert({ Width: 350, Height: 200, Title: "弹出提示框", Content: "你好，你选择的内容是空白的", ConfirmFun: test }); }) $("#btnConfirm").click(function() { $.DialogBySHF.Confirm({ Width: 350, Height: 200, Title: "弹出确认框", Content: "你确定要删除这条内容吗", ConfirmFun: test, CancelFun: testCancel }); }) $("#btnDialog").click(function() { $.DialogBySHF.Dialog({ Width: 1024, Height: 500, Title: "新开一个窗口", URL: "http://www.jb51.net" }); }) }) function test() { $.DialogBySHF.Alert({ Width: 350, Height: 200, Title: "确认后执行方法", Content: "确认后执行的方法" }); } function testCancel() { $.DialogBySHF.Alert({ Width: 350, Height: 200, Title: "取消后执行方法", Content: "取消后执行的方法" }); } </script> </body> </html>

效果图：

希望本文所述对大家jQuery程序设计有所帮助。