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=;i<tr.length;i++){
                    if(i%==){
                        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="" width="" cellspacing="" cellpadding="">
    <tr>
        <td></td>
        <td></td>
        <td></td>
        <td></td>
        <td></td>
    </tr>
    <tr>
        <td></td>
        <td></td>
        <td></td>
        <td></td>
        <td></td>
    </tr>
    <tr>
        <td></td>
        <td></td>
        <td></td>
        <td></td>
        <td></td>
    </tr>
    <tr>
        <td></td>
        <td></td>
        <td></td>
        <td></td>
        <td></td>
    </tr>
    <tr>
        <td></td>
        <td></td>
        <td></td>
        <td></td>
        <td></td>
    </tr>
    <tr>
        <td></td>
        <td></td>
        <td></td>
        <td></td>
        <td></td>
    </tr>
    <tr>
        <td></td>
        <td></td>
        <td></td>
        <td></td>
        <td></td>
    </tr>
    <tr>
        <td></td>
        <td></td>
        <td></td>
        <td></td>
        <td></td>
    </tr>
</table>

2，十字叉变色

<table id="table" border="" width="" cellspacing="" cellpadding=""></table>

<script>

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

                        var tds = document.getElementsByTagName("td");
                        for(var k=; k<tds.length; k++){
                            tds[k].style.backgroundColor="#fff";
                        }

                        table.rows[i].style.backgroundColor="red";

                        for(var k=; k<rows[i].cells.length; k++){
                            table.rows[x].cells[k].style.backgroundColor="red";
                        }
                        for(var k=; k<rows.length; k++){
                            table.rows[k].cells[y].style.backgroundColor="red";
                        }

                    };
                }
            })(i)
        }

    }
</script>