javascript-使用OnClick()计算用户放入HTML表中的数字的平均值

当前在识别我的HTML / JavaScript代码中的错误时遇到问题,这阻止了我的JavaScript函数计算由表用户输入的五个数字的平均值.

将数字输入所需的单元格后,单击“计算成绩”没有任何反应.努力看问题.

var table = document.getElementById("myTable");var rows = table.rows;for (var i = 0; i < rows.length; i  ) {  var cells = rows[i].cells;  var sum = 0;  for (var x = 0; x < cells.length; x  ) {    var cell = cells[x];    sum  = parseInt(cell.innerHTML);  }  var average = sum / cells.length;  rows[i].innerHTML  = "<td>"   average   "</td>";}

<table id="myTable" style="width:100%">  <tr>    <th id="StudentName" bgcolor="FFF55A">Name</th>    <th id="IDnumber" bgcolor="#FFF55A">ID</th>    <th bgcolor="#FFF55A">Assignment 1</th>    <th bgcolor="#FFF55A">Assignment 2</th>    <th bgcolor="#FFF55A">Assignment 3</th>    <th bgcolor="#FFF55A">Assignment 4</th>    <th bgcolor="#FFF55A">Assignment 5</th>    <th bgcolor="#FFF55A">Final</th>  </tr>  <tr>    <td contenteditable='false'>Person1 </td>    <td>1546396</td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>  </tr>  <tr>    <td contenteditable='false'>Person2</td>    <td contenteditable='false'>45942544</td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>  </tr>  <tr>    <td contenteditable='false'>Person3</td>    <td contenteditable='false'>48498465</td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>  </tr>  <tr>    <td contenteditable='false'> Person4</td>    <td contenteditable='false'>4964984</td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>  </tr>  <tr>    <td contenteditable='false'>Person5</td>    <td contenteditable='false'> 5686846</td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>  </tr>  <tr>    <td contenteditable='false'>Person6</td>    <td contenteditable='false'>498465</td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>  </tr>  <tr>    <td contenteditable='false'>Person7</td>    <td contenteditable='false'>654684</td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>  </tr>  <tr>    <td contenteditable='false'>Person8</td>    <td contenteditable='false'>6498497</td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>  </tr>  <tr>    <td contenteditable='false'>Person9</td>    <td contenteditable='false'>8749846</td>    <td contenteditable='true'>2</td>    <td contenteditable='true'>45</td>    <td contenteditable='true'>57</td>    <td contenteditable='true'>2</td>    <td contenteditable='true'>4</td>  </tr>  <tr>    <td contenteditable='false'>Person10</td>    <td contenteditable='false'>984894</td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>    <td contenteditable='true'></td>  </tr></table><button onclick="myFunction()" class="button1">Calculate grade</button>

解决方法:

我编辑了小提琴：https://jsfiddle.net/StarStep/m7v1j5zz/105/
并在计算按钮上添加了一个事件列表器：
< button id =“ myFunction” class =“ button1”>计算成绩< / button>

function myFunction() {   var table = document.getElementById("myTable");   var rows = table.rows;   for (var i = 1; i < rows.length; i  ) {     var cells = rows[i].cells;     var sum = 0;         var numbers = 0;     for (var x = 2; x < (cells.length -1); x  ) {       var cell = cells[x];       var addme = parseInt(cell.innerHTML);       if(!isNaN(addme)) {                 sum  = addme;          numbers  ;       }     }     var average = sum / numbers;     rows[i].cells[7].innerHTML = "<td>"   Math.round(average)   "</td>";   } }document.getElementById('myFunction').onclick = myFunction;

来源：https://www.icode9.com/content-1-557201.html