javascript - 中断 setInterval 和变量未定义

Question

我是 Javascript 的新手并尝试执行此脚本。单击它应该获取项目的价格并停止价格下降。单击时，它不会停止，也不会获取显示的价格。请指教。

价格应该是:-

起始价格:100最低最高价格:90

function updateValue(task) {
  var amount = document.getElementById("amount").value + "00";
  var maxamt = document.getElementById("maxamount").value + "00";
  var amountgrabbed = document.getElementById("revese-amt").value;

  var decimal_places = 2;
  var decimal_factor = decimal_places === 0 ? 1 : Math.pow(10, decimal_places);
  var floored_number = Math.floor(amount) / decimal_factor;
  var floored_number_max = Math.floor(maxamt) / decimal_factor;
  floored_number = floored_number.toFixed(decimal_places);
  floored_number_max = floored_number_max.toFixed(decimal_places);

  if (task == "stop") {
    console.log(amountgrabbed);
    check(refreshid, "stop", amountgrabbed);
  } else {

    var refreshid = setInterval(function() {
      floored_number = floored_number - 1 / 100;
      floored_number = floored_number.toFixed(decimal_places);
      if (floored_number < floored_number_max) {
        check(refreshid, "over");
      } else {
        $('#revese-amt').html(floored_number);
      }

    }, 100);

  }

}

function check(refreshid, status, amt) {

  if (status == "over") {
    clearInterval(refreshid);
    $('#revese-amt').html('Deal Gone!');
  } else if (status == "stop") {
    console.log(amt);
    clearInterval(refreshid);
    alert('Congratulations! You have grabbed the item @ price of RM ' + amt);
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input 
     type="text" 
     name="amount" 
     id="amount" 
     value="Start Price" 
     onclick=""/>
<BR>
<BR>
<input 
     type="text" 
     name="maxamount" 
     id="maxamount" 
     value="Lowest Max Price" 
     onblur="updateValue()"
 />
<span id="maxa"></span>
<BR>
<BR>
<div 
     style="width:130px; height:50px; background-color:red;"          
     onclick="updateValue('stop')">
  <center>MYR
    <p id="revese-amt"></p>
  </center>
</div>

Answer 1

您可以更改以下代码:

第一个 html p 标签，必须使用 textContent 方法来获取它的文本。

// change
var amountgrabbed = document.getElementById("revese-amt").value;

// to
var amountgrabbed = document.getElementById("revese-amt").textContent;