function checkInput() {
        var txtName = document.getElementById("txtUserName").value;
        var txtPwd = document.getElementById("txtUserPassword").value;
        var loginType = document.getElementById("loginType").value;
        var alrMsg = "";
        if (loginType == 0) {
            alrMsg = "请输入账号";
        } else {
            alrMsg = "请输入手机号/IMEI号";
        }

        if ($.trim(txtName) == "") {
            alert(alrMsg);
            $("#txtUserName").focus();
            return false;
        } else if ($.trim(txtPwd) == "") {
            alert("请输入密码");
            $("#txtUserPassword").focus();
            return false;
        }
        return true;
    }