Pop-up box plug-in based on jQuery_jquery

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/*
* jquery.popwin.js 1.0
* Copyright (c) gaoyubao
* Date: 2012-01-12
* 1. Click the button to pop up your For the content you want to pop up, just set the id or class
2. When the browser window is reduced, the pop-up box will always be centered
3. Press ESC to close the window
*/
(function($) {
var css='';
$("head").append(css);
$.fn.popwin= function( options) {
var settings={
element: "element", //Which pop-up box can be id or class
width: 400,
height: 200,
title: "title" //The title of the pop-up box
}
var s=$.extend(settings,options);
var htmlCode=$(s.element).html();
$(s.element).remove();
$.a={
//Set the width and height of the background
setBg: function() {
var bh=$("body" ).height(),wh=$(window).height(),ww=$(window).width();
if(bh>wh) {
wh=bh;
}
$("#bg").css({
width: ww,
height: wh
});
},
//Set the pop-up box to center
setFlag : function() {
var l=(document.documentElement.clientWidth-s.width)/2 "px",
t=(document.documentElement.clientHeight-s.height)/2 "px";
$("#flagBox").css({
width: s.width,
height: s.height,
left: l,
top: t
}) ;
},
//Close the pop-up box
setClose: function() {
$("#container").remove();
}
};
var html='';
$(window).resize(function() {//Adjust the size of the window
$.a.setFlag();
});
return this.each(function() {
$(this).bind("click",function(){
$("body").append(html);
$("#titleBox a").click(function() {
$.a.setClose();
});
$.a.setBg();
$ .a.setFlag();
});
$(document).keydown(function(event) {
if(event.which=="27") {
$.a. setClose();
}
});
});
};
})(jQuery)
function isEmail(str) {
var reg = /^ ([a-zA-Z0-9_-]) @ ([a-zA-Z0-9_-]) (.[a-zA-Z0-9_-])/;
if(reg.exec(str )) {
return false;
}else {
return true;
}
}
function check() {
var flag=true;
$( "#nameErr").html('');
$("#passwordErr").html('');
$("#emailErr").html('');
var username=$("#username").val();
var password=$("#password").val();
var email=$("#email").val();
if(username=="" || username==null) {
$("#nameErr").html("Name cannot be empty");
flag=false;
}
if(password=="") {
$("#passwordErr").html("Password cannot be empty");
flag=false;
}
if(email ==="") {
$("#emailErr").html("Email cannot be empty");
flag=false;
}else if(isEmail(email)) {
$("#emailErr").html("Email format error");
flag=false;
}
return flag;
}