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40种网站常用Javascript技巧

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          1. oncontextmenu="window.event.returnValue=false" 将彻底屏蔽鼠标右键
<table border oncontextmenu=return(false)><td>no</table> 可用于Table

          2. <body onselectstart="return false"> 取消选取、防止复制

          3. onpaste="return false" 不准粘贴

          4. oncopy="return false;" oncut="return false;" 防止复制

          5. <link rel="Shortcut Icon" href="favicon.ico"> IE地址栏前换成自己的图标

          6. <link rel="Bookmark" href="favicon.ico"> 可以在收藏夹中显示出你的图标

          7. <input style="ime-mode:disabled"> 关闭输入法

          8. 永远都会带着框架
          <script language="JavaScript">

                      if (window == top)top.location.href = "frames.htm"; //frames.htm为框架网页
          </script>

          9. 防止被人frame
          <SCRIPT LANGUAGE=JAVASCRIPT>
                        if (top.location != self.location)top.location=self.location;
          </SCRIPT>

          10. 网页将不能被另存为
           <noscript>

                        <iframe src="/blog/*.html>";</iframe>

           </noscript>

          11. <input type=button value=查看网页源代码
                  onclick="window.location = "view-source:"+ "http://www.williamlong.info"">

          12.删除时确认
           <a href="javascript:if(confirm("确实要删除吗?"))location="boos.asp?&areyou=删除&page=1"">删除</a>

          13. 取得控件的绝对位置
           //Javascript
           <script language="Javascript">
                      function getIE(e){
                                   var t=e.offsetTop;
                                   var l=e.offsetLeft;
                                   while(e=e.offsetParent)
                                           alert("top="+t+"/nleft="+l);
                      }
            </script>

            14. 光标是停在文本框文字的最后
            <script language="javascript">
                        function cc(){
                                     var e = event.srcElement;
                                     var r =e.createTextRange();
                                     r.moveStart("character",e.value.length);
                                     r.collapse(true);
                                     r.select();
                        }
             </script>
             <input type=text name=text1 value="123" onfocus="cc()">

             15. 判断上一页的来源
              javascript:
              document.referrer
 
              16. 最小化、最大化、关闭窗口
              <object id=hh1 classid="clsid:ADB880A6-D8FF-11CF-9377-00AA003B7A11">
                           <param name="Command" value="Minimize">

              </object>
              <object id=hh2 classid="clsid:ADB880A6-D8FF-11CF-9377-00AA003B7A11">
                           <param name="Command" value="Maximize">

              </object>
              <OBJECT id=hh3 classid="clsid:adb880a6-d8ff-11cf-9377-00aa003b7a11">
                             <PARAM NAME="Command" VALUE="Close">

              </OBJECT>
              <input type=button value=最小化 onclick=hh1.Click()>
              <input type=button value=最大化 onclick=hh2.Click()>
              <input type=button value=关闭 onclick=hh3.Click()>
              本例适用于IE

              17.屏蔽功能键Shift,Alt,Ctrl
              <script>
                          function look(){
                                       if(event.shiftKey)
                                        alert("禁止按Shift键!"); //可以换成ALT CTRL
                           }
                           document.onkeydown=look;
              </script>

              18. 网页不会被缓存
              <META HTTP-EQUIV="pragma" CONTENT="no-cache">
              <META HTTP-EQUIV="Cache-Control" CONTENT="no-cache, must-revalidate">
              <META HTTP-EQUIV="expires" CONTENT="Wed, 26 Feb 1997 08:21:57 GMT">
              或者<META HTTP-EQUIV="expires" CONTENT="0">

              19.怎样让表单没有凹凸感?
              <input type=text style="border:1 solid #000000">
或<input type=text style="border-left:none; border-right:none; border-top:none; border-bottom:

1 solid #000000"></textarea>

              20.<div><span>&<layer>的区别?
              <div>(division)用来定义大段的页面元素,会产生转行
              <span>用来定义同一行内的元素,跟<div>的唯一区别是不产生转行
              <layer>是ns的标记,ie不支持,相当于<div>

              21.让弹出窗口总是在最上面:
              <body onblur="this.focus();">

              22.不要滚动条?
              让竖条没有:
              <body style="overflow:scroll;overflow-y:hidden">
              </body>
              让横条没有: 
              <body style="overflow:scroll;overflow-x:hidden">
              </body>
              两个都去掉?更简单了
              <body scroll="no">
              </body>

              23.怎样去掉图片链接点击后,图片周围的虚线?
              <a href="#" onFocus="this.blur()"><img src="/blog/logo.jpg" border=0></a>

              24.电子邮件处理提交表单
             <form name="form1" method="post" action="mailto:****@***.com" enctype="text/plain">
<input type=submit></form>

              25.在打开的子窗口刷新父窗口的代码里如何写?
              window.opener.location.reload()

              26.如何设定打开页面的大小
              <body onload="top.resizeTo(300,200);">打开页面的位置<body onload="top.moveBy(300,200);">

              27.在页面中如何加入不是满铺的背景图片,拉动页面时背景图不动 
              <STYLE>
              body
              {background-image:url(/blog/logo.gif); background-repeat:no-repeat;
              background-position:center;background-attachment: fixed}
              </STYLE>

              28. 检查一段字符串是否全由数字组成
              <script language="Javascript">

                          function checkNum(str){return str.match(//D/)==null}
                                      alert(checkNum("1232142141"))
                                      alert(checkNum("123214214a1"))
              </script>

              29. 获得一个窗口的大小
              document.body.clientWidth; document.body.clientHeight

              30. 怎么判断是否是字符
              if (/[^/x00-/xff]/g.test(s))

                     alert("含有汉字");
              else

                     alert("全是字符");

              31.TEXTAREA自适应文字行数的多少
              <textarea rows=1 name=s1 cols=27 onpropertychange="this.style.posHeight=this.scrollHeight"></textarea>

              32. 日期减去天数等于第二个日期
              <script language=Javascript>
                          function cc(dd,dadd){
                                       //可以加上错误处理
                                        var a = new Date(dd)
                                        a = a.valueOf()
                                        a = a - dadd * 24 * 60 * 60 * 1000
                                        a = new Date(a)
                                       alert(a.getFullYear() + "年" + (a.getMonth() + 1) + "月" + a.getDate() + "日")
                          }
                                       cc("12/23/2002",2)
               </script>

               33. 选择了哪一个Radio
               <HTML>

                         <script language="vbscript">
                                     function checkme()
                                                   for each ob in radio1
                                                         if ob.checked then window.alert ob.value
                                                          next
                                     end function
                         </script>

               <BODY>
                         <INPUT name="radio1" type="radio" value="style" checked>Style
                         <INPUT name="radio1" type="radio" value="barcode">Barcode
                         <INPUT type="button" value="check" onclick="checkme()">
               </BODY>

               </HTML>

               34.脚本永不出错
               <SCRIPT LANGUAGE="JavaScript">
                             function killErrors() {
                                           return true;
                             }
                             window.onerror = killErrors;
               </SCRIPT>

               35.ENTER键可以让光标移到下一个输入框
                <input onkeydown="if(event.keyCode==13)event.keyCode=9">

               36. 检测某个网站的链接速度:
               把如下代码加入<body>区域中:
               <script language=Javascript>
                           tim=1
                           setInterval("tim++",100)
                           b=1
                           var autourl=new Array()
                           autourl[1]="www.njcatv.net"
                           autourl[2]="javacool.3322.net"
                           autourl[3]="www.sina.com.cn"
                           autourl[4]="www.nuaa.edu.cn"
                           autourl[5]="www.cctv.com"
                           function butt(){
                                        document.write("<form name=autof>")
                                        for(var i=1;i<autourl.length;i++)
                                              document.write("<input type=text name=txt"+i+" size=10 value="/blog/测试中......>" =》

                           <input type=text name=url"+i+" size=40> =》

                           <input type=button value=GO  onclick=window.open(this.form.url"+i+".value)><br/>")
                           document.write("<input type=submit value=刷新>

                           </form>")
                          }
                           butt()
                           function auto(url)
                 else

                           b++
}
                function run(){

                              for(var i=1;i<autourl.length;i++)

                                         document.write("<img src=http://"+autourl+"/"+Math.random()+" width=1 height=1  onerror=auto("http://"+autourl+"")>")}
               run() 

               </script>

 

               37. 各种样式的光标
               auto :标准光标
               default :标准箭头
               hand :手形光标
               wait :等待光标
               text :I形光标
               vertical-text :水平I形光标
               no-drop :不可拖动光标
               not-allowed :无效光标
               help :?帮助光标
               all-scroll :三角方向标
               move :移动标
               crosshair :十字标
               e-resize
               n-resize
               nw-resize
               w-resize
               s-resize
               se-resize
               sw-resize

               38.页面进入和退出的特效
               进入页面

               <meta http-equiv="Page-Enter" content="revealTrans(duration=x, transition=y)">
               退出页面

               <meta http-equiv="Page-Exit" content="revealTrans(duration=x, transition=y)">
               这个是页面被载入和调出时的一些特效。duration表示特效的持续时间,以秒为单位。transition表示使用哪种特效,取值为1-23:
           0 矩形缩小
           1 矩形扩大
           2 圆形缩小
           3 圆形扩大
           4 下到上刷新
           5 上到下刷新
           6 左到右刷新
           7 右到左刷新
           8 竖百叶窗
           9 横百叶窗
           10 错位横百叶窗
           11 错位竖百叶窗
           12 点扩散
           13 左右到中间刷新
           14 中间到左右刷新
           15 中间到上下
           16 上下到中间
           17 右下到左上
           18 右上到左下
           19 左上到右下
           20 左下到右上
           21 横条
           22 竖条
           23 以上22种随机选择一种

 

               39.在规定时间内跳转
               <META http-equiv=V="REFRESH" content="5;URL=http://www.williamlong.info">

               40.网页是否被检索
               <meta name="ROBOTS" content="属性值">
           其中属性值有以下一些:


           属性值为"all": 文件将被检索,且页上链接可被查询;
           属性值为"none": 文件不被检索,而且不查询页上的链接;
           属性值为"index": 文件将被检索;
           属性值为"follow": 查询页上的链接;
           属性值为"noindex": 文件不检索,但可被查询链接;
           属性值为"nofollow": 文件不被检索,但可查询页上的链接。

               最大化窗口?
               <script language="JavaScript">
                         self.moveTo(0,0)
                         self.resizeTo(screen.availWidth,screen.availHeight)
               </script>

 


              页面自动刷新(说明)

              当你做网页时,是不是有的时候想让你的网页自动不停刷新,或者过一段时间自动跳转到另外一个你自己设定的页面?其实实现这个效果非常地简单,而且这个效果甚至不能称之为特效。你只要把如下代码加入你的网页中就可以了。

              1,页面自动刷新:把如下代码加入<head>区域中<meta http-equiv="refresh" content="20">,其中20指每隔20秒刷新一次页面.

              2, 页面自动跳转:把如下代码加入<head>区域中<meta http-equiv="refresh" content="20;url=http://www.williamlong.info">,其中20指隔20秒后跳转到http: //www.williamlong.info页面。

             页面自动关闭:5000是指时间<body onLoad="setTimeout(window.close, 5000)">

弹出窗口自动关闭

             10秒后弹出窗口自动关闭

             注意:在新的tan.htm的body中要加 <onLoad="closeit()">
             head

                    <script language="JavaScript">

                                var gt = unescape('%3e');

                                var popup = null;

                                var over = "Launch Pop-up Navigator";

                                popup = window.open('', 'popupnav', 'width=225,height=235,resizable=1,scrollbars=auto');

                                if (popup != null) {

                                    if (popup.opener == null) {

                                       popup.opener = self;

                                    }

                                    popup.location.href = 'tan.htm';

                               }

                    </script>
                    <body>注意:这段代码是在新建文件中的
                               <script language="JavaScript">

                                            function closeit()

                               </script>

                    这个可不是<iframe>(引用)呀。是直接调用的。以下代码加入<body>区域

                    <object type="text/x-scriptlet" width="800" height="1000" data="../index.htm">
                     </object>

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