Question

我正在使用JavaScript计算两天之间的日差。在某些情况下，我得到了正确的结果，但有些情况下我无法得到正确的结果。我在下面解释我的代码。

function caldate(){
       var difference=Math.abs((parseInt(document.getElementById('dayto').value)%7)-(parseInt(document.getElementById('dayfrom').value)%7))+1;
           alert(difference);
}

当day to是星期天时，我得到了错误的结果。我的plunkr code就在这里。我需要计算两天之间的差异，包括选定的两天。

Answer 1

不要使用%？

＆＃13;

function caldate() {
  var day1 = document.getElementById('dayfrom').value;
  var day2 = document.getElementById('dayto').value;
  var difference = Math.abs((parseInt(document.getElementById('dayto').value)) - (parseInt(document.getElementById('dayfrom').value))) + 1;

  if (isNaN(difference)) {
    return true;
  }
  document.getElementById("output").innerHTML = "<p>Difference between day " +
    day1 + " and day " +
    day2 + " is: " +
    difference + " day" +
    (difference > 1 ? "s" : '') +
    "</p>" +
    document.getElementById("output").innerHTML

}

＆＃13;

<h1>Hello</h1>
<div class="col-md-6">
  <div class="input-group bmargindiv1 col-md-12">
    <span class="input-group-addon ndrftextwidth text-right" style="width:180px">Day From :</span>
    <select id="dayfrom">
      <option value="">Select day</option>
      <option value="1">Monday</option>
      <option value="2">Tuesday</option>
      <option value="3">Wedensday</option>
      <option value="4">Thrusday</option>
      <option value="5">Friday</option>
      <option value="6">Saturday</option>
      <option value="7">Sunday</option>
    </select>
  </div>
</div>
<div class="col-md-6">
  <div class="input-group bmargindiv1 col-md-12">
    <span class="input-group-addon ndrftextwidth text-right" style="width:180px">Day To :</span>
    <select id="dayto">
      <option value="">Select day</option>
      <option value="1">Monday</option>
      <option value="2">Tuesday</option>
      <option value="3">Wedensday</option>
      <option value="4">Thrusday</option>
      <option value="5">Friday</option>
      <option value="6">Saturday</option>
      <option value="7">Sunday</option>
    </select>
  </div>
</div>
<input type="button" id="btn" onclick="caldate();" value="Check">
<div id="output"></div>

＆＃13;

使用JavaScript无法在两天之间获得适当的差异值

1 个答案: