转载：http://www.cnblogs.com/weeky/archive/2012/04/08/2438002.html
以下可以直接调用，注意：jQuery引用用的Google.js》
1 <html xmlns="http://www.w3.org/1999/xhtml"> 2 <head> 3 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 4 <title>input失去焦点和获得焦点jquery焦点事件插件 - 懒人建站</title> 5 <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js" type="text/javascript"></script> 6 <script type="text/javascript"> 7 $(document).ready(function(){ 8 //focusblur 9 jQuery.focusblur = function(focusid) { 10 var focusblurid = $(focusid); 11 var defval = focusblurid.val(); 12 focusblurid.focus(function(){ 13 var thisval = $(this).val(); 14 if(thisval==defval){ 15 $(this).val(""); 16 } 17 }); 18 focusblurid.blur(function(){ 19 var thisval = $(this).val(); 20 if(thisval==""){ 21 $(this).val(defval); 22 } 23 }); 24 25 }; 26 /*下面是调用方法*/ 27 $.focusblur("#searchkey"); 28 }); 29 </script> 30 </head> 31 32 <body> 33 <form action="" method="post"> 34 <input name="" type="text" value="输入搜索关键词" id="searchkey"/> 35 <input name="" type="submit" id="searchbtn" value="搜索"/> 36 </form> 37 <p>input失去焦点和获得焦点jquery焦点事件插件，<br/><strong style="color:#F00">鼠标在搜索框中点击的时候里面的文字就消失了</strong>。</p> 38 39 </body> 40 </html>
select 中option的change事件：
1 $("#CSS_Font_Style").change(function(){ 2 changeEvent(); 3 })
获取input的内容：
1 var CSS_Border_Width = $("#CSS_Border_Width").val();
获取option的内容：
1 var CSS_Font_Style = $("#CSS_Font_Style").find("option:selected").text();
jQuery动态设置css属性：
1 <div id = "divcss">
$(".divcss").css({
2 "border-width":CSS_Border_Width+"px",
3 "background-color":CSS_Background_Color,
4 "background-position":CSS_Background_Position,
5 "background-size":CSS_Background_Size,
6 "border-color":CSS_Border_Color,
7 "background-image":CSS_Background_Image,
8 "font-weight":CSS_Font_Weight,
9 "font-size":CSS_Font_Size,
10 "line-height":CSS_Font_Line_Height,
11 "font-family":CSS_Font_Family,
12 "font-variant":CSS_Font_Variant,
13 "border-style":CSS_Border_Style,
14 "background-repeat":CSS_Background_Repeat,
15 "background-origin":CSS_Background_Origin,
16 "background-attachment":CSS_Background_Attachment,
17 "font-style":CSS_Font_Style,
18 })