javascript - Why does creating a multi-row and multi-column table only have a table in one row at the end?

Question

I wrote a function myself to create a table with multiple rows and columns, but after writing it, I found that I could only create one row and multiple columns.

    <p id="game-box"></p>
    <script>
            var Tab=createGrids(16,10);
            var gameBox=document.getElementById("game-box");
            gameBox.appendChild(Tab);
            // 创建网格
            function createGrids(row,col) {
                var Tab=document.createElement("table");
                var Tbody=document.createElement("tbody");
                var i=0,j=0;
                while(i<row) {
                    var Tr=document.createElement("tr");
                    while(j<col) {
                        var Td=document.createElement("td");
                        Tr.appendChild(Td);
                        j++;
                    }
                    Tbody.appendChild(Tr);
                    i++;
                }
                Tab.appendChild(Tbody);
                return Tab;
            }
    </script>

Answer 1

Because you run while(i<row) 的结束时候 while(j<col)中的 j 已经是10了哦，所以，第二遍循环 i以后，创建的tr里面都是没有 td 的，因为没有走进while(j<col) for the first time,

You can change it to this

    <p id="game-box"></p>
    <script>
            var Tab=createGrids(16,10);
            var gameBox=document.getElementById("game-box");
            gameBox.appendChild(Tab);
            // 创建网格
            function createGrids(row,col) {
                var Tab=document.createElement("table");
                var Tbody=document.createElement("tbody");
                var i=0;
                while(i<row) {
                    var Tr=document.createElement("tr");
                    var j=0;
                    while(j<col) {
                        var Td=document.createElement("td");
                        Tr.appendChild(Td);
                        j++;
                    }
                    Tbody.appendChild(Tr);
                    i++;
                }
                Tab.appendChild(Tbody);
                return Tab;
            }
    </script>

It should be fine