返回 false；不适用于每个功能

Question

我在下面提到了我的代码，return flase 有问题；在 javascript 中每个函数

$(".current_patient_medicine").each(function (i) {
    var id = this.id;
    var value = $("#" + id).val();
    if (value.trim() == "") {

        check = false;
        alert("Medicine Name cannot left Blank.");
        return false;
    } else {
        check = true;
    }
});
$(".current_patient_medicine_days").each(function (i) {
    var id = this.id;
    var value = $("#" + id).val();
    if (value.trim() == "") {

        check = false;
        alert("Days Field cannot left Blank.");
        return false;
    } else {
        check = true;
    }
});

这里第一个条件警报“药物名称不能留空”显示良好，但之后第二个警报也显示

Answer 1

你在内部函数调用中有return false，它不会停止外部函数的执行流程，所以你需要

var check = true;
$(".current_patient_medicine").each(function (i) {
    var value = this.value;
    if (value.trim() == "") {
        check = false;
        alert("Medicine Name cannot left Blank.");
        return false;
    }
});
if (!check) {
    return false;
}
$(".current_patient_medicine_days").each(function (i) {
    var value = this.value;
    if (value.trim() == "") {
        check = false;
        alert("Days Field cannot left Blank.");
        return false;
    }
});
if (!check) {
    return false;
}

$('button').click(function() {
  var check = true;
  $(".current_patient_medicine").each(function(i) {
    var value = this.value;
    if (value.trim() == "") {
      check = false;
      alert("Medicine Name cannot left Blank.");
      return false;
    }
  });
  if (!check) {
    return false;
  }
  $(".current_patient_medicine_days").each(function(i) {
    var value = this.value;
    if (value.trim() == "") {
      check = false;
      alert("Days Field cannot left Blank.");
      return false;
    }
  });
  if (!check) {
    return false;
  }
})

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<input id="m1" class="current_patient_medicine" />
<input id="d1" class="current_patient_medicine_days" />
<br />
<input id="m2" class="current_patient_medicine" />
<input id="d2" class="current_patient_medicine_days" />
<br />
<button>Test</button>