function conRes()
{
    document.getElementById("txtName").value = "";
    document.getElementById("txtAddress").value = "";
    document.getElementById("txtTel").value = "";
    document.getElementById("txtEmail").value = "";
    document.getElementById("txtContent").value = "";
}

function onChk()
{
    var name = document.getElementById("txtName").value;
    var tel = document.getElementById("txtTel").value;
    var Email = document.getElementById("txtEmail").value;
    var ServiceAdvice = document.getElementById("txtContent").value;
    if(name!="" && tel!="" && Email != "" && ServiceAdvice!= "")
    {
        
        var usertel = document.getElementById("txtTel");
        var reg = new RegExp(/^([0-9]|[\-])+$/g);
        
        if(usertel.value.length< 7 || usertel.value.length>18 || !reg.test(usertel.value))
        {
            alert("请正确填写您的电话号码！");
            usertel.focus();
            return false;
        }
        
         var username = document.getElementById("txtEmail");
         if(username.value=="") 
        { 
            alert("请填写您的邮箱地址！");
            username.focus();
            return false;
        } 
        var re = new RegExp(/^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/g);
         if(!re.test(username.value))
        { 
            alert("请正确输入您的 email 地址！");
             username.focus();
             return false; 
        }
        return true;
    }
    alert("请至少填写您的姓名、邮箱、正文及基本联系方式！");
    return false;
}