function yanzheng(val) {

        return val.replace(/(^\s*)|(\s*$)/g, "");

    }

 

function Inputchecking() {

        var account = document.getElementById("txt_ACCOUNT");

  if (yanzheng(account.value) == "") {

            alert('请输入账号');

            account.focus();

            return false;

}else{

    return true;

}