汇总：一些不错的使用频率比较高的JS函数

if (
(is_greater(day,-1,0))&&(is_less(day,-1,days))&&
(is_greater(month,-1,0))&&(is_less(month,-1,13))&&
(is_greater(year,-1,1900))&&(is_less(year,-1,2500))
)
Ret=true;
}
}
if (!Ret) doCritCode(field,crit,msg);

return(Ret);
}

function doCrit(field,crit,msg)
{
if ( (-1!=crit) )
{
alert(msg);
if (crit==1)
{
field.focus(); // focus does not work on certain netscape versions
}
}
}
// 判断是否有有效数据被选中
function isselected(field,crit,msg)
{
value=""+field.options[field.selectedIndex].value;
if(value=="0")
Ret=false;
else
Ret=true;
if (!Ret)
doCrit(field,crit,msg);
return(Ret);
}

// 检查是否是字符
// cCharacter：输入值
function isCharacter( cCharacter )
{
var sFormat = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

if( sFormat.indexOf( cCharacter, 0 ) == -1 )
{
return false;
}

return true;
}

//判断是否是数字和字母的组合
function isChrandNum( cCharacter )
{
for(ilen=0;ilen<str.length;ilen++)
{
if(str.charAt(ilen) < '0' str.charAt(ilen) > '9' )
{
if(str.charAt(ilen) < 'a' str.charAt(ilen) > 'z' )
{
if(str.charAt(ilen) < 'A' str.charAt(ilen) > 'Z' )
return false;
}
}
}
return true;
}

// 检查是否是其它可以作名称的字符
// cCharacter：输入值
function isOtherNameCharacter( cCharacter )
{
var sFormat = "_";

if( sFormat.indexOf( cCharacter, 0 ) == -1 )
{
return false;
}

return true;
}
function isOtherNameCharacter1( cCharacter )
{
var sFormat = "-";

if( sFormat.indexOf( cCharacter, 0 ) == -1 )
{
return false;
}

return true;
}

function isOtherNameCharacter2( cCharacter )
{
var sFormat = ".";

if( sFormat.indexOf( cCharacter, 0 ) == -1 )
{
return false;
}

return true;
}

// 检查是否是可以作名称的字符
// sValue：输入值
function isNameCharacter( sValue )
{
if( sValue == null )
{
return false;
}

for( i = 0; i < sValue.length; i ++ )
{
var cCharacter = sValue.charAt( i );
if( isDigital( cCharacter ) == false && isCharacter( cCharacter ) == false && isOtherNameCharacter( cCharacter ) == false&& isOtherNameCharacter1( cCharacter ) == false&& isOtherNameCharacter2( cCharacter ) == false )

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