//首先要引入jquery，以及ui的包和皮膚的樣式如：
<script src="../js/ui/jquery-1.11.0.min.js"></script>
 <script src="../js/ui/jquery-migrate-1.1.0.min.js"></script>
 <script src="../js/ui/minified/jquery.ui.core.min.js"></script>
  <script src="../js/ui/minified/jquery.ui.widget.min.js"></script>
  <script src="../js/ui/minified/jquery.ui.mouse.min.js"></script>
  <script src="../js/ui/minified/jquery.ui.button.min.js"></script>
  <script src="../js/ui/minified/jquery.ui.draggable.min.js"></script>
<link rel="stylesheet" type="text/css" href="../js/ui/themes/humanity/jquery-ui.css"></link>
 
 
 
(function($) {
 
$.alerts = {
 
// These properties can be read/written by accessing $.alerts.propertyName from your scripts at any time
 
verticalOffset: -75, // vertical offset of the dialog from center screen, in pixels
horizontalOffset: 0, // horizontal offset of the dialog from center screen, in pixels/
repositionOnResize: true, // re-centers the dialog on window resize
overlayOpacity: .01, // transparency level of overlay
overlayColor: '#FFF', // base color of overlay
draggable: true, // make the dialogs draggable (requires UI Draggables plugin)
okButton: '&nbsp;確認(rèn)&nbsp;', // text for the OK button
cancelButton: '&nbsp;取消&nbsp;', // text for the Cancel button
dialogClass: null, // if specified, this class will be applied to all dialogs
 
// Public methods
 
alert: function(message, title, callback) {
if( title == null ) title = 'Alert';
$.alerts._show(title, message, null, 'alert', function(result) {
if( callback ) callback(result);
});
},
 
confirm: function(message, title, callback) {
if( title == null ) title = 'Confirm';
$.alerts._show(title, message, null, 'confirm', function(result) {
if( callback ) callback(result);
});
},
 
prompt: function(message, value, title, callback) {
if( title == null ) title = 'Prompt';
$.alerts._show(title, message, value, 'prompt', function(result) {
if( callback ) callback(result);
});
},
 
// Private methods
 
_show: function(title, msg, value, type, callback) {
 
$.alerts._hide();
$.alerts._overlay('show');
 
$("BODY").append(
'<div id="popup_container" style="width:300px;height:150px;">' +
'<h2 id="popup_title" style="margin:0;padding:0;" class="ui-dialog-titlebar ui-widget-header ui-corner-all ui-helper-clearfix"></h2>' +
'<div id="popup_content">' +
'<div id="popup_message"></div>' +
'</div>' +
'</div>');
 
if( $.alerts.dialogClass ) $("#popup_container").addClass($.alerts.dialogClass);
 
// IE6 Fix
//var pos = ($.browser.msie && parseInt($.browser.version) <= 6 ) ? 'absolute' : 'fixed';
var pos = ('undefined' == typeof (document.body.style.maxHeight)) ? 'absolute' : 'fixed';
 
$("#popup_container").css({
position: pos,
zIndex: 99999,
padding: 0,
margin: 0
});
 
$("#popup_title").text(title);
$("#popup_content").addClass(type);
$("#popup_message").text(msg);
$("#popup_message").html( $("#popup_message").text().replace(/\n/g, '<br />') );
 
$("#popup_container").css({
minWidth: $("#popup_container").outerWidth(),
maxWidth: $("#popup_container").outerWidth()
});
 
$.alerts._reposition();
$.alerts._maintainPosition(true);
 
switch( type ) {
case 'alert':
$("#popup_message").after('<div id="popup_panel"><input type="button" onmouseover="$(this).addClass(\'ui-state-hover\')" onmouseout="$(this).removeClass(\'ui-state-hover\')" class="ui-button ui-widget ui-state-default ui-corner-all ui-button-text-only" value="' + $.alerts.okButton + '" id="popup_ok" /></div>');
$("#popup_ok").click( function() {
$.alerts._hide();
callback(true);
});
$("#popup_ok").focus().keypress( function(e) {
if( e.keyCode == 13 || e.keyCode == 27 ) $("#popup_ok").trigger('click');
});
break;
case 'confirm':
$("#popup_message").after('<div id="popup_panel"><input type="button" onmouseover="$(this).addClass(\'ui-state-hover\')" onmouseout="$(this).removeClass(\'ui-state-hover\')" class="ui-button ui-widget ui-state-default ui-corner-all ui-button-text-only" value="' + $.alerts.okButton + '" id="popup_ok" /> <input type="button" onmouseover="$(this).addClass(\'ui-state-hover\')" onmouseout="$(this).removeClass(\'ui-state-hover\')" class="ui-button ui-widget ui-state-default ui-corner-all ui-button-text-only"  value="' + $.alerts.cancelButton + '" id="popup_cancel" /></div>');
$("#popup_ok").click( function() {
$.alerts._hide();
if( callback ) callback(true);
});
$("#popup_cancel").click( function() {
$.alerts._hide();
if( callback ) callback(false);
});
$("#popup_ok").focus();
$("#popup_ok, #popup_cancel").keypress( function(e) {
if( e.keyCode == 13 ) $("#popup_ok").trigger('click');
if( e.keyCode == 27 ) $("#popup_cancel").trigger('click');
});
break;
case 'prompt':
$("#popup_message").append('<br /><input type="text" size="30" id="popup_prompt" />').after('<div id="popup_panel"><input type="button" onmouseover="$(this).addClass(\'ui-state-hover\')" onmouseout="$(this).removeClass(\'ui-state-hover\')" class="ui-button ui-widget ui-state-default ui-corner-all ui-button-text-only" value="' + $.alerts.okButton + '" id="popup_ok" /> <input type="button" onmouseover="$(this).addClass(\'ui-state-hover\')" onmouseout="$(this).removeClass(\'ui-state-hover\')" class="ui-button ui-widget ui-state-default ui-corner-all ui-button-text-only"  value="' + $.alerts.cancelButton + '" id="popup_cancel" /></div>');
$("#popup_prompt").width( $("#popup_message").width() );
$("#popup_ok").click( function() {
var val = $("#popup_prompt").val();
$.alerts._hide();
if( callback ) callback( val );
});
$("#popup_cancel").click( function() {
$.alerts._hide();
if( callback ) callback( null );
});
$("#popup_prompt, #popup_ok, #popup_cancel").keypress( function(e) {
if( e.keyCode == 13 ) $("#popup_ok").trigger('click');
if( e.keyCode == 27 ) $("#popup_cancel").trigger('click');
});
if( value ) $("#popup_prompt").val(value);
$("#popup_prompt").focus().select();
break;
}
 
// Make draggable
if( $.alerts.draggable ) {
try {
$("#popup_container").draggable({ handle: $("#popup_title") });
$("#popup_title").css({ cursor: 'move' });
} catch(e) { /* requires jQuery UI draggables */ }
}
},
 
_hide: function() {
$("#popup_container").remove();
$.alerts._overlay('hide');
$.alerts._maintainPosition(false);
},
 
_overlay: function(status) {
switch( status ) {
case 'show':
$.alerts._overlay('hide');
$("BODY").append('<div class="ui-widget-overlay" id="popup_overlay"></div>');
break;
case 'hide':
$("#popup_overlay").remove();
break;
}
},
 
_reposition: function() {
var top = (($(window).height() / 2) - ($("#popup_container").outerHeight() / 2)) + $.alerts.verticalOffset;
var left = (($(window).width() / 2) - ($("#popup_container").outerWidth() / 2)) + $.alerts.horizontalOffset;
if( top < 0 ) top = 0;
if( left < 0 ) left = 0;
 
// IE6 fix
if ('undefined' == typeof (document.body.style.maxHeight)) top = top + $(window).scrollTop();
 
$("#popup_container").css({
top: top + 'px',
left: left + 'px'
});
},
 
_maintainPosition: function(status) {
if( $.alerts.repositionOnResize ) {
switch(status) {
case true:
$(window).bind('resize', function() {
$.alerts._reposition();
});
break;
case false:
$(window).unbind('resize');
break;
}
}
}
 
}
 
// Shortuct functions
jAlert = function(message, title, callback) {
$.alerts.alert(message, title, callback);
}
 
jConfirm = function(message, title, callback) {
$.alerts.confirm(message, title, callback);
};
 
jPrompt = function(message, value, title, callback) {
$.alerts.prompt(message, value, title, callback);
};
 
})(jQuery);
 
 
 
<style>
*{margin:0;padding:0;}
#popup_container {
font-family: Arial, sans-serif;
font-size: 12px;
min-width: 300px; /* Dialog will be no smaller than this */
max-width: 600px; /* Dialog will wrap after this width */
background: #FFF;
border: solid 1px #D09042;
color: #000;
-moz-border-radius: 5px;
-webkit-border-radius: 5px;
border-radius: 5px;
}
 
 
#popup_content {
background: 16px 16px no-repeat url(images/info.gif);
padding: 1em 1.75em;
margin: 0em;
}
 
#popup_content.alert {
background-image: url(../images/info.png);
}
 
#popup_content.confirm {
background-image: url(../images/important.png);
}
 
#popup_content.prompt {
background-image: url(../images/help.png);
}
 
#popup_message {
padding-left: 48px;
height:30px;
padding-top:10px;
font-size:15px;
}
 
#popup_panel {
text-align: center;
margin: 1em 0em 0em 1em;
}
 
#popup_prompt {
margin: .5em 0em;
}
</style>
 
//使用方法
<script>
jConfirm('您確定嗎?', '系統(tǒng) 提示', function(r) {
  jAlert('你選擇了: ' + r, '友情提示');
});
</script>