如何让此函数从范围中添加或减去并返回它

How do I get this function to add or subtract from a range and return it?

本文关键字：返回 添加 函数 范围      更新时间：2023-09-26

我试图让函数"RipIt"（不是我的名字）获取这个杜威十进制数列表，并在满足某些条件时对这些数字进行加减（例如，100 到 200 之间的所有数字，加 100，就像第一个其他 if 语句一样）并在单击按钮时返回答案，以及说明这已更改的文本通知或警报。我是一个完全的初学者，我被困在最后一部分 - 使函数加减并给我答案。谁能帮忙？完全初学者，所以请温柔一点，谢谢！！

<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
function RipIt() {
    for(var i = l; i <= 25; i++) {
        var dewey = parseFloat(document.getElementById(i).innerHTML);
        if(dewey >= 100 && 200 >= dewey) {
            document.getElementById(dewey) + 100
        } else if(dewey >= 400 && 500 >= dewey) {
            document.getElementById(dewey) + 200
        } else if(dewey >= 850 && 900 >= dewey) {
            document.getElementById(dewey) - 100
        } else if(dewey >= 600 && 650 >= dewey) {
            document.getElementById(dewey) + 17
        }
    }
}
</script>
</head>     
<body>
<h4>Records to Change</h4>
<ul id="myList">
  <li id ="1">101.33</li>
  <li id = "2">600.01</li>
  <li id = "3">001.11</li>    
<li id = "4">050.02</li>
  <li id = "5">199.52</li>
  <li id = "6">400.27</li>
<li id = "7">401.73</li>
  <li id = "8">404.98</li>
  <li id = "9">no number</li>
<li id = "10">850.68</li>
  <li id = "11">853.88</li>
  <li id = "12">407.8</li>
  <li id = "13">878.22</li>
  <li id = "14">175.93</li>
  <li id = "15">175.9</li>
<li id = "16">176.11</li>
  <li id = "17">190.97</li>
  <li id = "18">90.01</li>
<li id = "19">191.001</li>
  <li id = "20">600.95</li>
  <li id = "21">602.81</li>
<li id = "22">604.14</li>
  <li id = "23">701.31</li>
  <li id = "24">606.44</li>
  <li id = "25">141.77</li>
</ul>
<b> </b>
<input type="button" value="Click To Run" onclick="RipIt()">
<!-- <input type="button" value="Click Here" onClick="showAlert();"> -->
</body>
</html>

有更好的方法可以做到这一点...但以下是对代码的一些更改，使其正常工作：

<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
    function RipIt() {
        for (var i = 1; i <= 25; i++) {
            var dewey = parseFloat(document.getElementById(i).innerHTML);
            if (dewey >= 100 && 200 >= dewey) {
                dewey += 100;
            }
            else if (dewey >= 400 && 500 >= dewey) {
                dewey += 200
            }
            else if (dewey >= 850 && 900 >= dewey) {
                dewey -= 100
            }
            else if (dewey >= 600 && 650 >= dewey) {
                dewey += 17
            }
            alert("Item " + i + " changed from " + document.getElementById(i).innerHTML + " to " + dewey.toFixed(2));
            document.getElementById(i).innerHTML = dewey.toFixed(2);
        }
    }
</script>
</head>     
<body>
<h4>Records to Change</h4>
<ul id="myList">
  <li id ="1">101.33</li>
  <li id = "2">600.01</li>
  <li id = "3">001.11</li>    
<li id = "4">050.02</li>
  <li id = "5">199.52</li>
  <li id = "6">400.27</li>
<li id = "7">401.73</li>
  <li id = "8">404.98</li>
  <li id = "9">no number</li>
<li id = "10">850.68</li>
  <li id = "11">853.88</li>
  <li id = "12">407.8</li>
  <li id = "13">878.22</li>
  <li id = "14">175.93</li>
  <li id = "15">175.9</li>
<li id = "16">176.11</li>
  <li id = "17">190.97</li>
  <li id = "18">90.01</li>
<li id = "19">191.001</li>
  <li id = "20">600.95</li>
  <li id = "21">602.81</li>
<li id = "22">604.14</li>
  <li id = "23">701.31</li>
  <li id = "24">606.44</li>
  <li id = "25">141.77</li>
</ul>
<b> </b>
<input type="button" value="Click To Run" onclick="RipIt()">
<!-- <input type="button" value="Click Here" onClick="showAlert();"> -->
</body>
</html>
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