<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
        <script>
            window.onload = function() {
                var oldColor;
                var tblEle = document.getElementById("tbl");
                var len = tblEle.tBodies[0].rows.length;
                for(var i = 0;i<len;i++) {
                    if(i%2==0) {
                        tblEle.tBodies[0].rows[i].style.backgroundColor = "pink";
                        //添加鼠标经过事件
                        tblEle.tBodies[0].rows[i].onmouseover = function() {
                            oldColor = this.style.backgroundColor;
                            this.style.backgroundColor = "blue";
                        }
                        // 添加鼠标离开事件
                        tblEle.tBodies[0].rows[i].onmouseout = function() {
                            this.style.backgroundColor = oldColor;
                        }
                    }else{
                        tblEle.tBodies[0].rows[i].style.backgroundColor = "gold";
                        //添加鼠标经过事件
                        tblEle.tBodies[0].rows[i].onmouseover = function() {
                            oldColor = this.style.backgroundColor;
                            this.style.backgroundColor = "blue";
                        }
                        // 添加鼠标离开事件
                        tblEle.tBodies[0].rows[i].onmouseout = function() {
                            this.style.backgroundColor = oldColor;
                        }
                    }
                }
            }
        </script>
    </head>
    <body>
        <table id="tbl" border="1" border-collapse="collapse" align="center" cellspacing="0" cellpadding="5" width="400" height="20">
            <thead>
                <tr>
                    <th>编号</th><th>姓名</th><th>年龄</th>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td>1</td>
                    <td>张三</td>
                    <td>12</td>
                </tr>
                <tr>
                    <td>2</td>
                    <td>李四</td>
                    <td>22</td>
                </tr>
                <tr>
                    <td>3</td>
                    <td>王五</td>
                    <td>13</td>
                </tr>
                <tr>
                    <td>4</td>
                    <td>马六</td>
                    <td>14</td>
                </tr>
                <tr>
                    <td>5</td>
                    <td>伍六七</td>
                    <td>17</td>
                </tr>
                <tr>
                    <td>6</td>
                    <td>梅花十三</td>
                    <td>17</td>
                </tr>
            </tbody>
        </table>
    </body>
</html>

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