js当月水电气简单计算器

function StorePage(){d=document;t=d.selection?(d.selection.type!='None'?d.selection.createRange().text:''):(d.getSelection?d.getSelection():'');void(keyit=window.open('http://www.365key.com/storeit.aspx?t='+escape(d.title)+'&u='+escape(d.location.href)+'&c='+escape(t),'keyit','scrollbars=no,width=475,height=575,left=75,top=20,status=no,resizable=yes'));keyit.focus();}


body{
font-size:12px;
text-align: center;
}
td{font-size:12px;
}
.outtab
{
border-top-width: 1px;
border-right-width: 1px;
border-bottom-width: 1px;
border-left-width: 1px;
border-top-style: solid;
border-right-style: solid;
border-bottom-style: solid;
border-left-style: solid;
border-top-color: #CCCCCC;
border-right-color: #CCCCCC;
border-bottom-color: #CCCCCC;
border-left-color: #CCCCCC;
}
#main
{
border: 1px solid #CCCCCC;
width:600px;
height:200px;
text-align: left;
padding: 10px;
}
//数字型验证部分
// JavaScript Document

//控制输入的形式为数值
function CheckNum(thetxtNum)
{
var _value = thetxtNum.value;
var kc=window.event.keyCode;

if(kc==110 || kc==190)//如果是.
{
if(_value.length==0)//第一个不允许输入。
{
alert("不能以小数点开头！");
window.event.returnValue = false;
return;
}
if(_value.indexOf(".")>=0)//如果已经存在.
{
//window.event.keyCode=8;
alert("不能再次输入小数点！");
window.event.returnValue = false;
return;
}
}

//alert(kc);
if( (kc>=48 && kc=96 && kc=112 && kc