js实现字符串左右空格的函数cTrim()

function cTrim(sInputString,iType)
//字符串去空格的函数(iType：1=去掉字符串左边的空格;2=去掉字符串左边的空格;0=去掉字符串左边和右边的空格)
return value:
//去掉空格的字符串

{
var sTmpStr = ' '
var i = -1

if(iType == 0 || iType == 1)
{
while(sTmpStr == ' ')
{
++i
sTmpStr = sInputString.substr(i,1)
//substr(n1,n2)为从数组下标n1开始截取n2长度后的字符串
}
sInputString = sInputString.substring(i)
//substring(n)为从数组下标n开始截取后的字符串
}

if(iType == 0 || iType == 2)
{
sTmpStr = ' '
i = sInputString.length
while(sTmpStr == ' ')
{
--i
sTmpStr = sInputString.substr(i,1)
}
sInputString = sInputString.substring(0,i+1)
//substring(n1,n2)为从数组下标n1开始到数组下标“n2 - 1”为止的字符串
}
return sInputString
}