solicitud personalizada de validación de formulario html5

<formulario novalidate = "novalidate" οnsubmit = "return validity.call (this)">
    <input type = "text" name = "t" patrón requerido = "^ \ d + $" data-validity-valueMissing = "提示 1" data-validity-patternMismatch = "提示 2" />
    <input type = "submit" />
</form>

Estado de validez

    function validityInput() {
        var t = this.validity;
        if (t.valid) return true;
        for (var v in t) {
            if (t[v] === true) {
                var err = this.getAttribute('data-validity-' + v);
                if (err) {
                    this.setCustomValidity(err);
                    return this.reportValidity();
                }
            }
        }
        this.setCustomValidity('');
        return this.reportValidity();
    }
    function validity() {
        var el = this.elements;
        for (var i = 0; i < el.length; i++) {
            if (el[i].reportValidity && !validityInput.call(el[i])) return false;
        }
        return true;
    }