当前页面: 开发资料首页 → Javascript 专题 → 事半功倍之Javascript(4)
事半功倍之Javascript(4)
摘要: 事半功倍之Javascript(4)
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>
圆的面积:<input type=text name=area>
<input type=button name=button1 value=计算圆的面积 onclick=document.form1.area.value=document.form1.rad.value*document.
</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"+"
"+array1[RandomNo])
</script>
3.使用平方根
<form name=form1>
value:<input type=text name=va1>
平方根<input type=text name=sqrt>
<input type=button name=button1 value=计算平方根
</form>
4.数字的舍入
<form name=form1>
输入<input type=text name=val>
舍入的结果<input type=text name=round>
<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>
指数<input type=text name=power>
幂<input type=text name=result>
<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>
数字2<input type=text name=val2>
最小值<input type=text name=min>
最大值<input type=text name=max>
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.
</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+"
")
document.write("表单text1名称是: "+document.form1.text1.name+"
")
document.write("表单text1值是: "+document.form1.text1.value+"
")
document.write("表单text1大小是: "+document.form1.text1.size+"
")
</script>
<form name=form1>
<input type=text name=text1 value=click here
</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+"
")
document.write("表单pw1的名称:"+document.form1.pw1.name+"
")
document.write("表单pw1的值:"+document.form1.pw1.value+"
")
document.write("表单pw1的大小:"+document.form1.pw1.size+"
")
</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+"
")
document.write("表单hid1的名称:"+document.form1.hid1.name+"
")
document.write("表单hid1的值:"+document.form1.hid1.value+"
")
</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+"
")
document.write("表单ta1的名称:"+document.form1.ta1.name+"
")
document.write("表单ta1的值:"+document.form1.ta1.value+"
")
document.write("表单ta1的横向宽度:"+document.form1.ta1.cols+"
")
document.write("表单ta1的纵向宽度:"+document.form1.rows.value+"
")
</script>
<form name=form1>
<textarea name=ta1 rows=4 onfocus="document.form1.ta1.select()"> how many grains of sand are there in the sahara desert?</textarea>
</form>
5.使用按钮
<form name=form1>
<input type=button name=button1 value=标准按钮>
</form>
<script>
document.write("表单button1的类型:"+document.form1.button1.type+"
")
document.write("表单button1的名称:"+document.form1.button1.name+"
")
document.write("表单button1的值:"+document.form1.button1.value+"
")
</script>
<form name=form1>
<input type=text name=text1 size=45>
<input type=button name=button1 value=panic button onclick="document.form1.text1.value='sittle down,count to 10 and take a deep breath'">
</form>
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+"
")
document.write("表单reset1的名称:"+document.form1.reset1.name+"
")
document.write("表单reset1的值:"+document.form1.reset1.value+"
")
</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+"
")
document.write("表单submit1的名称:"+document.form1.submit1.name+"
")
document.write("表单submit1的值:"+document.form1.submit1.value+"
")
</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+"
")
document.write("表单cb1是否被选择?:"+document.form1.cb1.checked+"
")
document.write("表单cb1的名称:"+document.form1.cb1.name+"
")
</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+"
")
document.write("第二个按钮被选择"+document.form1.radio1[1].checked+"
")
document.write("按钮的名称"+ document.form1.radio1[0].name+"
")
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+"
")
document.write("这个选择列表的长度"+document.form1.select1.length+"
")
document.write("这个选择列表当前被选择的索引号"+document.form1.select1.selectedIndex+"
")
document.write("这个选择列表的尺寸"+document.form1.select1.size+"
")
</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?>
<input type=text name=text2 value=is there?>
<input type=text name=text3 value=or maybe here?>
<input type=button name=button1 value="text box #1" onclick=document.form1.text1.focus()>
<input type=button name=button2 value="text box #2" onclick=document.form1.text2.focus()>
<input type=button name=button3 value="text box #3" onclick=document.form1.text3.focus()>
</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"+"
")
document.write("appcodename:"+navigator.appCodeName+"
")
document.write("appname::"+navigator.appName+"
")
document.write("appversion:"+navigator.appVersion+"
")
document.write("platform:"+navigator.platform+"
")
document.write("userAgent:"+navigator.userAgent+"
")
</script>
<script>
document.write("navigator对象的方法"+"
")
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"+"
")}
else if(navigator.appName.indexOf("Netscape")!=-1){
document.write("用户浏览器是netscape的netscape浏览器"+"
")}
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"+"
")
document.write("hash"+location.hash+"
")
document.write("hostname"+location.hostname+"
")
document.write("host"+location.host+"
")
document.write("href"+location.href+"
")
document.write("port"+location.port+"
")
document.write("search"+location.search+"
")
</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>
↑返回目录
前一篇: 冷静对待流行技术风潮：忽悠一下Ajax
后一篇: 事半功倍之Javascript(3)