消除输入的所有空格

function Trim(str,is_global)
{
    var result =  $.trim(str);
    result = str.replace(/(^\s+)|(\s+$)/g,"");
    if(is_global != undefined && is_global.toLowerCase()=="g")
        result = result.replace(/\s/g,"");
    return result;
}
 var username=$('.name').val();
 username=Trim(username);