JS实现table表格在鼠标移动出现一行变色或者十字叉变色

1，一行变色

<script>
            function trBg(){
                var tab=document.getElementById("table");
                var tr=tab.getElementsByTagName("tr");
                for(var i=0;i<tr.length;i++){
                    if(i%2==0){
                        tr[i].style.backgroundColor="#fff";

                        tr[i].onmouseover=function(){
                            this.style.background="red";
                        };
                        tr[i].onmouseout=function(){
                            this.style.background="#fff";
                        }
                    }else{
                        tr[i].style.backgroundColor="#fff";

                        tr[i].onmouseover=function(){
                            this.style.background="blue";
                        };
                        tr[i].onmouseout=function(){
                            this.style.background="#fff";
                        }
                    }
                }
            }
        window.onload=trBg;
</script>
<table id="table" border="1" width="400" cellspacing="0" cellpadding="0">
    <tr>
        <td>11111</td>
        <td>22222</td>
        <td>33333</td>
        <td>44444</td>
        <td>55555</td>
    </tr>
    <tr>
        <td>11111</td>
        <td>22222</td>
        <td>33333</td>
        <td>44444</td>
        <td>55555</td>
    </tr>
    <tr>
        <td>11111</td>
        <td>22222</td>
        <td>33333</td>
        <td>44444</td>
        <td>55555</td>
    </tr>
    <tr>
        <td>11111</td>
        <td>22222</td>
        <td>33333</td>
        <td>44444</td>
        <td>55555</td>
    </tr>
    <tr>
        <td>11111</td>
        <td>22222</td>
        <td>33333</td>
        <td>44444</td>
        <td>55555</td>
    </tr>
    <tr>
        <td>11111</td>
        <td>22222</td>
        <td>33333</td>
        <td>44444</td>
        <td>55555</td>
    </tr>
    <tr>
        <td>11111</td>
        <td>22222</td>
        <td>33333</td>
        <td>44444</td>
        <td>55555</td>
    </tr>
    <tr>
        <td>11111</td>
        <td>22222</td>
        <td>33333</td>
        <td>44444</td>
        <td>55555</td>
    </tr>
</table>

2，十字叉变色

<table id="table" border="1" width="600" cellspacing="0" cellpadding="0"></table>

<script>
    
    
    var html = '';
    for(var i = 0; i < 10; i++){
        html += '<tr>'
        for(var j = 0; j < 10; j++){
            html += '<td data-index="'+ i + '-' + j +'">' + i + '-'+ j + '</td>'
        }
        html += '</tr>'
    }
    document.getElementById("table").innerHTML = html;

    
    var table = document.getElementById("table"); 
    if(table.rows.length > 0){
        var rows = table.rows;
        for(var i=0; i<rows.length; i++){
            (function(i){
                var tds=rows[i];
                for(var j=0; j<tds.cells.length; j++){
                    var obj=tds.cells[j];
                    obj.onmouseover=function(e){
                        var val = this.getAttribute('data-index');
                        var x = val.split('-')[0];
                        var y = val.split('-')[1];
                        console.log(val)

                        var tds = document.getElementsByTagName("td");
                        for(var k=0; k<tds.length; k++){
                            tds[k].style.backgroundColor="#fff";
                        }
                        
                        table.rows[i].style.backgroundColor="red";
                        
                        for(var k=0; k<rows[i].cells.length; k++){
                            table.rows[x].cells[k].style.backgroundColor="red";
                        }
                        for(var k=0; k<rows.length; k++){
                            table.rows[k].cells[y].style.backgroundColor="red";
                        }

                    };
                }
            })(i)
        }

    }
</script>