js技巧2
- 51.向文件中写内容
- <%@ page import="java.io.*" %>
- <%
- String str = "print me";
- //always give the path from root. This way it almost always works.
- String nameOfTextFile = "/usr/anil/imp.txt";
- try
- {
- PrintWriter pw = new PrintWriter(new FileOutputStream(nameOfTextFile));
- pw.println(str);
- //clean up
- pw.close();
- }
- catch(IOException e)
- {
- out.println(e.getMessage());
- }
- %>
- 52.先读文件再写文件
- <%@ page language = "java" %>
- <%@ page contentType = "text/html; charSet=gb2312" %>
- <%@ page import ="java.util.*" %>
- <%@ page import ="java.lang.*" %>
- <%@ page import ="javax.servlet.*" %>
- <%@ page import ="javax.servlet.jsp.*" %>
- <%@ page import ="javax.servlet.http.*" %>
- <%@ page import="java.io.*" %>
- eryrytry
- <%
- int count=0;
- FileInputStream fi =new FileInputStream ("count.txt");
- ObjectInputStream si= new ObjectInputStream (fi);
- count =si.readInt();
- count++;
- out.print(count);
- si.close();
- FileOutputStream fo =new FileOutputStream ("count.txt");
- ObjectOutputStream so= new ObjectOutputStream (fo);
- so.writeInt(count);
- so.close();
- %>
- 53.直线型输入框
- <INPUT name=Password size=10 type=password style="border-left-width: 0; border-right-width: 0;
- border-top-width: 0; border-bottom-style: solid; border-bottom-width: 1; background-color: #9CEB9C">
- 54.可以将背景改为按钮性状，通过改变css改变属性
- <td width="65" align="center" bgcolor="#E0E0E0" onmouseover=this.className='mouseoverbt';
- onmouseout=this.className='mouseout';><a href="tm.asp?classid=76"><font
- color="#000000">录音笔</font></a></td>
- <style>
- .mouseoverbt
- {
- background-image: url(http://www.yongle.com.cn/img/btbgw64h20y.gif);
- background-repeat: no-repeat;
- }
- .mouseout
- {
- background-color: #E0E0E0;
- }
- </style>
- 55.同时按下CTRL和Q键
- document.onkeydown=function()
- {
- if(event.ctrlKey&&event.keyCode==81)
- {alert(1)}
- }//
- 56.以下是一个完整的显示hint的代码，其思想是当鼠标停留是将div中的内容显示在鼠标出，当鼠标移出后在将该div隐
- 藏掉
- ---------------------------------------------------------------------------------------------------------
- ------------
- <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
- <HTML>
- <style>
- #hint{
- width:198px;
- border:1px solid #000000;
- background:#99ff33;
- position:absolute;
- z-index:9;
- padding:6px;
- line-height:17px;
- text-align:left;
- top: 1520px;
- }
- </style>
- <SCRIPT LANGUAGE="JavaScript">
- <!--
- function showme()
- {
- var oSon=window.document.getElementById("hint");
- if (oSon==null) return;
- with (oSon)
- {
- innerText=guoguo.value;
- style.display="block";
- style.pixelLeft=window.event.clientX+window.document.body.scrollLeft+6;
- style.pixelTop=window.event.clientY+window.document.body.scrollTop+9;
- }
- }
- function hidme()
- {
- var oSon=window.document.getElementById("hint");
- if (oSon==null) return;
- oSon.style.display="none";
- }
- //-->
- </SCRIPT>
- <BODY>
- <text id=guoguo value=ga>
- <a href=# onmouseover=showme() onmouseout=hidme() onmousemove=showme() son=hint>dfdfd</a>
- <div id=hint style="display:none"></div>
- </BODY>
- </HTML>
- ---------------------------------------------------------------------------------------------------------
- ------------
- 57.弹出窗口
- 方法一：<body onload="openwen()"> 浏览器读页面时弹出窗口；
- 方法二：<body onunload="openwen()"> 浏览器离开页面时弹出窗口；
- 方法三：用一个连接调用：<a href="#" onclick="openwin()">打开一个窗口</a>
- 注意：使用的"#"是虚连接。
- 方法四：用一个按钮调用：<input type="button" onclick="openwin()" value="打开窗口"> 何时装载script
- 58.动态改变字体的大小
- function doZoom(size)
- {
- document.getElementById('zoom').style.fontSize=size+'px'
- }
- function aa()
- {
- var newWin=window.open(url);
- newWin.document.form1.text1.value=value1;
- }改变弹出窗口上域的属性
- opener.document.form2.text2.value=value2;改变父窗口的域的值
- 59.判断是何种浏览器
- var name = navigator.appName;
- if (name == "Microsoft Internet Explorer")
- alert("IE");
- else if (name == "Netscape")
- alert("NS");//
- 60.vbsscript确定框
- <script language="VBScript">
- <!--
- MsgBox "确定删除吗？", 4
- //-->
- </script>//
- 61.复制内容到剪切板
- function JM_cc(bb)
- {
- var ob=eval("document.form1."+bb);
- ob.select();
- js=ob.createTextRange();
- js.execCommand("Copy");
- }//
- 62.java中建立数据库连接取数据
- public void init()
- {
- String url="jdbc:odbc:javadata";
- try
- {
- Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
- Connection con=DriverManager.getConnection(url,"sa","");//mssql database user SA and password
- DatabaseMetaData dma=con.getMetaData();
- System.out.println("Connect to"+dma.getURL());
- System.out.println(";Driver "+dma.getDriverName());
- System.out.println(";Version "+dma.getDriverVersion());
- System.out.println("");
- Statement stmt=con.createStatement();
- ResultSet rs=stmt.executeQuery("select * from company.dbo.TB_NAME where number=1");//Sql
- rs.next();
- String dispresult=rs.getString("name");
- System.out.println(dispresult);// Instead,you can display it in Paint() or use AWT etc.
- rs.close();
- stmt.close();
- con.close();
- }
- catch(SQLException ex)
- {
- System.out.println("!!!SQL Exception !!!");
- while(ex!=null)
- {
- System.out.println("SQLState:"+ex.getSQLState());
- System.out.println("Message:"+ex.getMessage());
- System.out.println("Vendor:"+ex.getErrorCode());
- ex=ex.getNextException();
- System.out.println("");
- }
- }
- catch(java.lang.Exception ex)
- {
- ex.printStackTrace();
- }
- }//
- 63.最小化窗口
- window.blur()//
- 64.文档的路径
- document.URL//
- 65.定时执行某段程序
- setTimeout("change_color()",600);
- 66.设置为主页
- function makeHome(){
- netscape.security.PrivilegeManager.enablePrivilege("UniversalPreferencesWrite");
- navigator.preference("browser.startup.homepage", location.href);
- }//
- 67.设置为收藏
- function addFav(){
- if(ie)
- window.external.AddFavorite(location.href,'WWW.OGRISH.COM : GROTESQUE MOVIES AND PICTURES');
- if(ns)
- alert("Thanks for the bookmark!\n\nNetscape users click OK then press CTRL-D");
- }//
- 68.判断cookie是否可用
- navigator.cookieEnabled;//
- 69.显示有模式的有页面的弹出窗口
- function setbgcolor_onclick()
- {
- var color = showModalDialog("/mailpage/compose/colorsel.html",0,"help=0");
- if (color != null)
- {
- document.compose.bgcolor.value = color;
- }
- }//
- 70.截取小数点后两位
- var a=3454545.4454545;
- alert(a.toFixed(2));//
- 71.禁止选择页面上的文字来拷贝
- <script>
- function noEffect() {
- with (event) {
- returnValue = false;
- cancelBubble = true;
- }
- return;
- }
- </script>
- <body onselectstart="noEffect()" oncontextmenu="noEffect()">//
- 72.屏蔽右键菜单
- oncontextmenu="event.returnValue = false"//
- 73.事件禁止起泡
- event.cancelBubble = true//
- 74.禁止在输入框打开输入法
- <input style="ime-mode: disabled">//
- 75.屏蔽汉字和空格
- <input name="txt"><input type="submit" onClick="alert(!/[^ -}]|\s/.test(txt.value))">//
- 76.用javascript判断文件是否存在
- function Exists(filespec)
- {
- if (filespec)
- {
- var fso;
- fso = new ActiveXObject("Scripting.FileSystemObject");
- alert(fso.FileExists(filespec));
- }
- }
- 选择图片 <input type=file name=f1><p>
- <input type="submit" onClick="Exists(f1.value)">//
- 77.获得当前的文本框选中的文字
- <input onmouseup="alert(document.selection.createRange().text)" value=123>//
- 78.跳转至目标页面，同时不可返回
- <a href="javascript:location.replace('http://www.sohu.com/')">sohu.com</a>//
- 79.获得当前的行是表格的第几行
- <script>
- function getrow(obj)
- {
- if(event.srcElement.tagName=="TD"){
- curRow=event.srcElement.parentElement;
- alert("这是第"+(curRow.rowIndex+1)+"行");
- }
- }
- </script>
- <table border="1" width="100%" onclick=getrow(this)>
- <tr>
- <td width="20%"> </td>
- <td width="20%"> </td>
- <td width="20%"> </td>
- <td width="20%"> </td>
- <td width="20%"> </td>
- </tr>
- <tr>
- <td width="20%"> </td>
- <td width="20%"> </td>
- <td width="20%"> </td>
- <td width="20%"> </td>
- <td width="20%"> </td>
- </tr>
- </table>//
- 80.删除表格某行，xx表示某行，下标从0开始计算
- document.all.myTable.deleteRow(xx)//
- 81.动态的向表格中添加行
- <table id="t1" border="1">
- </table>
- <script language="JavaScript">
- function add()
- {
- t1.insertRow().insertCell().innerHTML = '<input name="test'+t1.rows.length+'">';
- }//