我檢查了 post 方法附帶的輸入。但是這個 if 條件代碼不起作用。編輯：否則落在他的街區(qū)是JavaScript$(".inputonlytext").keypress(function(e) {    var key = e.keyCode;    if ((key >= 48 && key <= 57) || (key >= 33 && key <= 47) || (key >= 58 && key <= 64) || (key >= 91 && key <= 96) || (key >= 123 && key <= 127)) {        e.preventDefault();    }    /*if (e.which === 32)        return false; */    //var text = $(this).val();    //$(this).val(text.replace(" ", ""));});是輸入<input type="text" name="name" class="form-control inputonlytext" maxlength="50" required="required"><input type="text" name="surname" class="form-control inputonlytext" maxlength="50" required="required">是PHP；if($_POST["name"] !== null && preg_match('/^[a-zA-Z ]+$/', $_POST["name"]) && $_POST["surname"] !== null && preg_match('/^[a-zA-Z ]+$/', $_POST["surname"])){            //true for my application logic. (think like a reverse)}else{            //false for my application logic. (think like a reverse)}