<!DOCTYPE html>
<html>
    <head>
        <  charset=\"UTF-8\">
        < >使用JQ完成表格隔行换色</ >
        <  src=\"js/jquery.min.js\"></ >
        < >
            $(function() {
                $(\"tbody tr:odd\").css(\"background-color\",\"aquamarine\");
                $(\"tbody tr:even\").css(\"background-color\",\"bisque\");
                var tb = $(\"tbody tr\");
                var oldColor;
                for(var i=0;i<tb.length;i++) {
                    //alert(oldColor);
                    $(\"tbody tr\")[i].  = function() {
                        oldColor = this.style.backgroundColor;
                        this.style.backgroundColor = \"yellow\";
                    }
                    $(\"tbody tr\")[i].  = function() {
                        this.style.backgroundColor = oldColor;
                    }
                }
            });
        </ >
    </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>

疑问:为什么this.style.backgroundColor = oldColor中的this不能用$("tbody tr")[i]代替??

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