javascript常用函数大全（三）
4.格式化字符串变量 <script> str1="peace,happiness and prosperity.<br>" document.write(str1) document.write(str1.big()) document.write(str1.small()) document.write(str1.bold()) document.write(str1.italics()) document.write(str1.strike()) document.write(str1.fontsize(6)) document.write(str1.fontcolor(green)) </script> 5.创建锚和链接 <script> str1="this is the bigginning of the page.<br>" str2="….<br>" str3="this is the end of the page .<br>" str4="link to the start<br>" str5="link to the end<br>" document.write(str1.anchor("start")) for(i=0;i<10;i++) document.write(str2); document.write(str3.anchor("end")) document.write(str4.link("#start")) document.write(str5.link("#end")) </script> 6.确定字符串长度 <script> str1="this is the bigginning of the page." document.write(str1+"<br>") document.write( "字符串的长度是:"+str1.length) document.write("字符串全部大写是;"+str1.toUpperCase()) document.write("字符串全部小写是;"+str1.toLowerCase()) </script> 7.在字符串内搜索 <script> str1="this is the end of the line.<br>" document.write(str1) document.write("字符end在字符串的位置是"+str1.search("end")) document.write("字符dog在字符串的位置是"+str1.search("dog")) </script> 8.定位字符串中的字符 <script> str1="spring is a time for flowers and trees and baby bunnles<br>" document.write(str1) document.write("the index for the second word ‘and' is"+str1.indexOf("and",30)) documednt.write("the last index of the word ‘and' is "+str1.lastIndexOf("and")) </script> 9.替换字符串中的文本 <script> str1="spring is a time for flowers and trees and baby bunnles<br>" document.write(str1) document .write(str1.replace("and",",")) </script> 10.字符串分离 <script> str1="spring is a time for flowers and trees and baby bunnles<br>" document.write(str1) str1array=str1.split(" ") document.write(str1array[0]+"<br>") document.write(str1array[1]+"<br>") document.write(str1array[2]+"<br>") document.write(str1array[3]+"<br>") </script> 第十章 使用日期和时间 1.使用Date对象 <script> cdate=new Date("august 2,1989 12:30:00") document.write(cdate) </script> 2.显示当地时间和日期 <script> cdate=new Date() document.write("当前时间是:"+cdate.toGMTString()+"<br>") document.write("日期和时间是:"+cdate.toLocaleString()) </script> 3.获得时间和日期值 <script> cdate=new Date() document.write("显示当前的星期"+cdate.getDay()+"<br>") document.write("显示当前的月份"+cdate.getMonth()+"<br>") document.write("显示当前的日期"+cdate.getDay()+"<br>") document.write("显示当前的年份"+cdate.getYear()+"<br>") document.write("显示当前的小时"+cdate.getHours()+"<br>") document.write("显示当前的分钟"+cdate.getMinutes()+"<br>") document.write("显示当前的秒"+cdate.getSeconds()+"<br>") </script> 4.设置时间和日期值 <script language=javascript> cdate=new Date("December 25,1984") document.write("显示日期"+cdate+"<br>") document.write("设置月份"+cdate.setMonth(10)+"<br>") document.write("设置日期"+cdate.setDate(23)+"<br>") document.write("设置年份"+cdate.setYear(2000)+"<br>") document.write("设置小时"+cdate.setHours(13)+"<br>"); document.write("设置分钟"+cdate.setMinutes(47)+"<br>"); document.write("设置秒"+cdate.setSeconds(23)+"<br>"); document.write("显示设置后的日期和时间"+cdate); </script> 第十一章 使用Math对象 1. 使用Math对象 <script language=javascript> </script> <form name=form1> 圆的半径:<input type=text name=rad><br> 圆的面积:<input type=text name=area><br> <input type=button name=button1 value=计算圆的面积 onclick=document.form1.area.value=document.form1.rad.value*document. form1.rad.value*Math.PI> </form> 2.生成随机数 <script> array1=new Array( "这是第1句", "这是第2句", "这是第3句", "这是第4句", "这是第5句", "这是第6句") RandomNo=Math.floor(array1.length*Math.random()) document.write("随机输出某一句"+"<br>"+array1[RandomNo]) </script> 3.使用平方根 <form name=form1> value:<input type=text name=va1><br> 平方根<input type=text name=sqrt><br> <input type=button name=button1 value=计算平方根 onclick="document.form1.sqrt.value=Math.sqrt(document.form1.va1.value)"> </form> 4.数字的舍入 <form name=form1> 输入<input type=text name=val><br> 舍入的结果<input type=text name=round><br> <input type=button name=button1 value=计算结果 onclick=document.form1.round.value=Math.round(document.form1.val.value)> </form> 5.乘方运算 <form name=form1> 底数<input type=text name=val><br> 指数<input type=text name=power><br> 幂<input type=text name=result><br> <input type=button name=button1 value=计算结果 onclick="document.form1.result.value=Math.pow (document.form1.val.value,document.form1.power.value)"> </form> 6.发现最小值和最大值 <form name=form1> 数字1<input type=text name=val1><br> 数字2<input type=text name=val2><br> 最小值<input type=text name=min><br> 最大值<input type=text name=max><br> 数字1<input type=button value=计算 onclick="document.form1.min.value=Math.min (document.form1.val1.value,document.form1.val2.value);document.form1. max.value= Math.max(document.form1.val1.value,document.form1.val2.value)"> </form> 第十二章 使用表单 1.使用文本框 <form name=form1> <input type=text value="information ,please"name=text1> </form> <script> document.write("表单text1类型是: "+document.form1.text1.type+"<br>") document.write("表单text1名称是: "+document.form1.text1.name+"<br>") document.write("表单text1值是: "+document.form1.text1.value+"<br>") document.write("表单text1大小是: "+document.form1.text1.size+"<br>") </script> <form name=form1> <input type=text name=text1 value=click here onfocus=document.form1.text1.select()> </form> 2.使用密码框 <form name=form1> <input type=password name=pw1 value=daylight> </form> <script> document.write("表单pw1的类型:"+document.form1.pw1.type+"<br>") document.write("表单pw1的名称:"+document.form1.pw1.name+"<br>") document.write("表单pw1的值:"+document.form1.pw1.value+"<br>") document.write("表单pw1的大小:"+document.form1.pw1.size+"<br>") </script> 3.使用隐藏字段 <form name=form1> <input type=hidden name=hid1 value=piece of eight> </form> <script> document.write("表单hid1的类型:"+document.form1.hid1.type+"<br>") document.write("表单hid1的名称:"+document.form1.hid1.name+"<br>") document.write("表单hid1的值:"+document.form1.hid1.value+"<br>") </script> 4.使用文本区域框 <form name=form1> <textarea name=ta1>how many grains of sand are there in the sahara desert?</textarea> </form> <script> document.write("表单ta1的类型:"+document.form1.ta1.type+"<br>") document.write("表单ta1的名称:"+document.form1.ta1.name+"<br>") document.write("表单ta1的值:"+document.form1.ta1.value+"<br>") document.write("表单ta1的横向宽度:"+document.form1.ta1.cols+"<br>") document.write("表单ta1的纵向宽度:"+document.form1.rows.value+"<br>") </script> 6.使用重置按钮 <form name=form1> <input type=reset name=reset1 value="rest form"> </form> <script> document.write("表单reset1的类型:"+document.form1.reset1.type+"<br>") document.write("表单reset1的名称:"+document.form1.reset1.name+"<br>") document.write("表单reset1的值:"+document.form1.reset1.value+"<br>") </script> 7.使用提交按钮 <form name=form1> <input type=submit name=submit1 value="submit form"> </form> <script> document.write("表单submit1的类型:"+document.form1.submit1.type+"<br>") document.write("表单submit1的名称:"+document.form1.submit1.name+"<br>") document.write("表单submit1的值:"+document.form1.submit1.value+"<br>") </script> 8.使用复选按钮 <form name=form1> <input type=checkbox name=cb1 >computer savvy? </form> <script> document.write("表单cb1的类型:"+document.form1.cb1.type+"<br>") document.write("表单cb1是否被选择?:"+document.form1.cb1.checked+"<br>") document.write("表单cb1的名称:"+document.form1.cb1.name+"<br>") </script> 9.使用单选按钮 <form name=form1> <input type=radio name=radio1>male <input type=radio name=radio1>female </form> <script> document.write("第一个按钮被选择"+document.form1.radio1[0].checked+"<br>") document.write("第二个按钮被选择"+document.form1.radio1[1].checked+"<br>") document.write("按钮的名称"+ document.form1.radio1[0].name+"<br>") document.write("按钮的个数"+document.form1.radio1.length) </script> 10.使用选择列表 <form name=form1> <select name=select1 size=4> <option name=option1 value=lon>london,England</option> <option name=option2 value=dub>Dublin,Ireland</option> </select> </form> <script> document.write("这个选择列表的名称"+document.form1.select1.name+"<br>") document.write("这个选择列表的长度"+document.form1.select1.length+"<br>") document.write("这个选择列表当前被选择的索引号"+document.form1.select1.selectedIndex+"<br>") document.write("这个选择列表的尺寸"+document.form1.select1.size+"<br>") </script> 11.验证表单的有效性 <script> function validate(){ if(document.form1.text1.value!='1'||'2'||'3'||'4'){ alert("请输入1~4的整数") } } </script> <form name=form1> 请输入1~4的整数: <input type=text name=text1 size=4 onchange=validate()> </form> 12.控制表单焦点 <form name=form1> <input type=text name=text1 value=where is you focus?><br> <input type=text name=text2 value=is there?><br> <input type=text name=text3 value=or maybe here?><br> <input type=button name=button1 value="text box #1" onclick=document.form1.text1.focus()><br> <input type=button name=button2 value="text box #2" onclick=document.form1.text2.focus()><br> <input type=button name=button3 value="text box #3" onclick=document.form1.text3.focus()><br> </form> 第十三章 使用分栏 第十四章 使用navigator 1.使用navigator对象 <script> document.write("navigator对象的属性"+"<br>") document.write("appcodename:"+navigator.appCodeName+"<br>") document.write("appname::"+navigator.appName+"<br>") document.write("appversion:"+navigator.appVersion+"<br>") document.write("platform:"+navigator.platform+"<br>") document.write("userAgent:"+navigator.userAgent+"<br>") </script> <script> document.write("navigator对象的方法"+"<br>") document.write("javaEnabled():"+navigator.javaEnabled()) </script> 2.检查用户的浏览器 <script> if(navigator.appName.indexOf("Microsoft")!=-1){ document.write("用户浏览器是微软的IE浏览器"+"<br>")} else if(navigator.appName.indexOf("Netscape")!=-1){ document.write("用户浏览器是netscape的netscape浏览器"+"<br>")} if(navigator.appVersion.indexOf("4.0")!=-1){ document.write("you are using a version 4.0compatible browser") } else{ document.write("this browser is not 4.0 compliant")} </script> 3.检测用户的操作系统 <script> if (navigator.platform.indexOf("win32")!=-1){ document.write("you are using a computer running windows 95 or highter")} else{ document.write("this computer is not running windows 95 or higher")} </script> 4.使用location对象 <script> document.write("location对象的属性"+"<br>") document.write("hash"+location.hash+"<br>") document.write("hostname"+location.hostname+"<br>") document.write("host"+location.host+"<br>") document.write("href"+location.href+"<br>") document.write("port"+location.port+"<br>") document.write("search"+location.search+"<br>") </script> 重新加载网页 <form name=form1> <input type=button name=button1 value=重新加载本页 onclick=location.reload> </form> 5.使用cookie <script> finction makecookie(){ if(!document.cookie){ name=prompt("请输入你的姓名"); document.cookie="name="+name+";";} } </script> <body onload=makecookie()> <script> function makecookie(){ if(!document.cookie){ name=prompt("请输入你的姓名") document.cookie="name="+name+";"; namestart=document.cookie.indexOf("="); nameend=document.cookieindexOf(";"); document.writeln("your name is:" +document.cookie.substring(namestart+1,nameend)+",br>") } } </script>