javascript惯用函数大全（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>