js 去掉空格

var MAX_PERIOD = $('#MAX_PERIOD').val(); // 借款的最大期限 
MAX_PERIOD=Trim(MAX_PERIOD,"g");   //带 g  是去除全局空格 

MAX_PERIOD=Trim(MAX_PERIOD,"");   //不带 g  是去除两端空格 

function Trim(str,is_global)
{
var result;
result = str.replace(/(^s+)|(s+$)/g,"");
if(is_global.toLowerCase()=="g")
{
result = result.replace(/s/g,"");
}
return result;
}