javascript常用
1.计算器js实现
<SCRIPT language="javascript"> function calculator(op) { var num1,num2; num1=parseFloat(document.form.txtNum1.value); //数据类型转换 num2=parseFloat(document.form.txtNum2.value); //数据类型转换 if (op=="+") //判断操作类型 document.form.txtResult.value=num1+num2 ; if (op=="-") document.form.txtResult.value=num1-num2 ; if (op=="*") document.form.txtResult.value=num1*num2 ; if (op=="/" && num2!=0) //num2！=0 被除数不能为0 document.form.txtResult.value=num1/num2 ; } </SCRIPT> </HEAD>
<BODY> <FORM name="form" method="get" action=""> <TABLE width="298" height="132" bgcolor="#66B3FF" border="1" align="center"> <TR> <TD height="35" colspan="3"><H3>计算器</H3></TD> </TR> <TR > <TD width="89" height="24" align="right" >第一个数</TD> <TD width="130"><INPUT name="txtNum1" type="text" class="textBaroder" size="10"></TD> <TD width="65" rowspan="3" align="center" > <INPUT name="addButton2" type="button" value=" + " onClick="calculator('+')"><BR> <INPUT name="subButton2" type="button" value=" - " onClick="calculator('-')"><BR> <INPUT name="mulButton2" type="button" value=" x " onClick="calculator('*')"><BR> <INPUT name="divButton2" type="button" value=" / " onClick="calculator('/')"><BR> </TD> </TR> <TR > <TD height="29" align="right" >第二个数</TD> <TD><INPUT name="txtNum2" type="text" class="textBaroder" size="10"></TD> </TR> <TR> <TD height="32" align="right" >计算结果</TD> <TD><INPUT name="txtResult" type="text" class="textBaroder" size="10"></TD> </TR> </TABLE>
2.buttom变着色
<SCRIPT type="text/javascript" language="javascript">
/*
javascript 中带参数的自定义函数调用
*/
function change(color){
if(color=="r"){
document.bgColor="red";
}else if(color=="b"){
document.bgColor="blue";
}else if(color=="g"){
document.bgColor="green"
}
}
</SCRIPT>
</HEAD>
<BODY>
<FORM action="" method="get" name="myform">
<TABLE width="459" border="0" cellspacing="0" cellpadding="0" align="center">
<TR align="center">
<TD width="143">
<INPUT type="button" name="btn1" value=" 不许碰我 " onClick="change('b')"></TD>
<TD width="153">
<INPUT type="button" name="btn2" value=" 警告你别碰我 " onClick="change('r')"></TD>
<TD width="163">
<INPUT name="btn3" type="button" value="给你点颜色看看" onClick="change('g')"></TD>
</TR>
</TABLE>
3.页面显示当前日期
<SCRIPT language="JavaScript">
<!--
function disptime( )
{
var time = new Date( ); //获得当前时间
var hour = time.getHours( ); //获得小时、分钟、秒
var minute = time.getMinutes( );
var second = time.getSeconds( );
var apm="AM"; //默认显示上午: AM
if (hour>12) //按12小时制显示
{
hour=hour-12;
apm="PM" ;
}
if (minute < 10) //如果分钟只有1位，补0显示
minute="0"+minute;
if (second < 10) //如果秒数只有1位，补0显示
second="0"+second;
/*设置文本框的内容为当前时间*/
document.myform.myclock.value =hour+":"+minute+":"+second+" "+apm;
/*设置定时器每隔1秒（1000毫秒），调用函数disptime()执行，刷新时钟显示*/
var myTime = setTimeout("disptime()",1000);
}
//-->
</SCRIPT>
<STYLE type="text/css">
<!--
/*设置样式：无边框的文本框*/
INPUT {
font-size: 30px;
border-style:none ;
background-color:#FF8B3B;
}
-->
</STYLE>
</HEAD>
<BODY onLoad="disptime( )">
<FORM NAME="myform">
<TABLE width="100%" border="0" align="center">
<TR>
<TD colspan="3"><IMG src="images/mosou.jpg" width="1001" height="457"></TD>
</TR>
<TR>
<TD width="37%"> </TD>
<TD width="41%"><H2>当前时间：
<INPUT name="myclock" type="text" value="" size="10" >
</H2></TD>
<TD width="22%"> </TD>
</TR>
</TABLE>
4.js打开link,close
<SCRIPT language="javascript">
function openwindow( )
{
window.status="系统当前状态：您正在注册用户......";
if (window.screen.width == 1024 && window.screen.height == 768)
window.showModalDialog("register.html", "注册窗口", "toolbars=0, location=0, statusbars=0, menubars=0,width=700,height=550,scrollbars=1");
else
window.alert("请设置分辨率为1024x768，然后再打开");
}
function closewindow( )
{
if(window.confirm("您确认要退出系统吗？"))
window.close( );
}
</SCRIPT>
<STYLE type="text/css">
<!--
/*设置无下划线的超连接样式*/
A {
color: blue;
text-decoration: none;
}
A:hover{ /*鼠标在超链接上悬停时变为颜色*/
color: red;
}
-->
</STYLE>
</HEAD>
<BODY bgcolor="#CCCCCC">
<TABLE border="0" align="center" bgcolor="#FFFFFF" >
<TR>
<TD colspan="3"><IMG src="images/head.jpg" width="761" height="389"></TD>
</TR>
<TR>
<TD width="502" >
<IMG src="images/foot.jpg" width="502" height="90" align="top"></TD>
<TD width="86" valign="top" ><H3><A href="javascript: openwindow( ) ">用户注册 </A></H3></TD>
<TD width="263" valign="top" > <H3><A href="javascript: closewindow( ) ">退 出</A></H3></TD>
</TR>
</TABLE>