这里有一个使用现代Javascript ES6+的解决方案

    const rows = document.querySelector("table")?.rows;
    if (!rows) {
      return;
    }
    Array.from(rows).forEach(row => {
      console.log(row);
      const cells = Array.from(row.cells);
      cells.forEach(cell => {
        console.log(cell);
      });
    });

Array.from()将HTMLCollection的行和/或单元格转换为一个常规的Javascript数组，你可以迭代通过。

表的文档。行使用率:https://developer.mozilla.org/en-US/docs/Web/API/HTMLTableElement/rows

行的文档。cell用法:https://developer.mozilla.org/en-US/docs/Web/API/HTMLTableRowElement

var表= . getelementbyid(“mytab1”); var r = 0;//开始计算表中的行数 而(行= table.rows (r + +)) ｛ var c = 0;//开始计数行中的列 而(细胞= row.cells (c++)) ｛ cell.innerHTML = ' [R ' + R + ' C ' + C + '] ';//用cell做某事 ｝ ｝ <表id = " mytab1 " > < tr > A1 < td > < / td > < td > A2 < / td > < td > A3 td > < / < / tr > < tr > < td > B1 < / td > < td > B2 < / td > < td > B3 td > < / < / tr > < tr > < td > C1 < / td > < td > C2 < / td > < td > C3 td > < / < / tr > 表> < /

每次遍历while循环时，r/c迭代器都会增加，集合中的新行/单元格对象会被赋值给行/单元格变量。当集合中没有更多的行/单元格时，将false赋给行/单元格变量，并通过while循环停止(退出)进行迭代。

如果你想遍历每一行(<tr>)，知道/识别行(<tr>)，并遍历每行(<tr>)的每一列(<td>)，那么这就是要走的路。

var table = document.getElementById("mytab1");
for (var i = 0, row; row = table.rows[i]; i++) {
   //iterate through rows
   //rows would be accessed using the "row" variable assigned in the for loop
   for (var j = 0, col; col = row.cells[j]; j++) {
     //iterate through columns
     //columns would be accessed using the "col" variable assigned in the for loop
   }  
}

如果您只想遍历单元格(<td>)，忽略您所在的行，那么可以这样做。

var table = document.getElementById("mytab1");
for (var i = 0, cell; cell = table.cells[i]; i++) {
     //iterate through cells
     //cells would be accessed using the "cell" variable assigned in the for loop
}

纯Javascript

功能numberofRow () { var =文档.getElementById(“mytab1”).修道院; getElementById (mytab1”)的文件。innerHTML = x; 的 numberofRow (); < div id = " myTabDiv > <table . the name="mytab" id="mytab1"> < tr > < td > col1 Val1 < / td > < td > col2 Val2 < / td > < / tr > < tr > < td > col1 Val3 < / td > < td > col2 Val4 < / td > < / tr > - < table > < / div >

es6:

const table = document.getElementById('some-table');
const cells = table.getElementsByTagName('td');

for (let cell of cells) {
   // do something with cell here
}

早期版本:

var table = document.getElementById('some-table');
var cells = table.getElementsByTagName('td');
for ( var i in cells ) {
   // do something with cells[i]
}

来源:https://developer.mozilla.org/en-US/docs/Web/API/Element/getElementsByTagName

这个解决方案对我来说非常有效

var table = document.getElementById("myTable").rows;
var y;
for(i = 0; i < # of rows; i++)
{    for(j = 0; j < # of columns; j++)
     {
         y = table[i].cells;
         //do something with cells in a row
         y[j].innerHTML = "";
     }
}