js 设置焦点在网页的位置 如何设置焦点在网页的中间位置,或者在网页的开头位置在一个很高的网页里面document.getElementById('abc').focus();这是焦点在网页的底部 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 <table width="500" border="1" cellpadding="0" cellspacing="0" bordercolor="#000000" id="tb" style="border-collapse:collapse"> <tr> <td>1</td> </tr> <tr> <td>2</td> </tr> <tr> <td>3</td> </tr> <tr> <td>4</td> </tr> <tr> <td>5</td> </tr> <tr> <td>6</td> </tr> <tr> <td>7</td> </tr> <tr> <td>8</td> </tr> <tr> <td>9</td> </tr> <tr> <td>10</td> </tr> <tr> <td>11</td> </tr> <tr> <td>12</td> </tr> <tr> <td>13</td> </tr> <tr> <td>14</td> </tr> <tr> <td>15</td> </tr> <tr> <td>16</td> </tr> <tr> <td>17</td> </tr> <tr> <td>18</td> </tr> <tr> <td>19</td> </tr> <tr> <td>20</td> </tr> <tr> <td>21</td> </tr> <tr> <td>22</td> </tr> <tr> <td>23</td> </tr> <tr> <td>24</td> </tr> <tr> <td>25</td> </tr> <tr> <td>26</td> </tr> <tr> <td>27</td> </tr> <tr> <td>28</td> </tr> <tr> <td>29</td> </tr> <tr> <td>30 <input name="bbb" type="text" id="bbb" /></td> </tr> <tr> <td>31</td> </tr> <tr> <td>32</td> </tr> <tr> <td>33</td> </tr> <tr> <td>34</td> </tr> <tr> <td>35</td> </tr> <tr> <td>36</td> </tr> <tr> <td>37</td> </tr> <tr> <td>38</td> </tr> <tr> <td>39</td> </tr> <tr> <td>40</td> </tr> <tr> <td>41</td> </tr> <tr> <td>42</td> </tr> <tr> <td>43</td> </tr> <tr> <td>44</td> </tr> <tr> <td>45</td> </tr> <tr> <td>46</td> </tr> <tr> <td>47</td> </tr> <tr> <td>48</td> </tr> <tr> <td>49</td> </tr> <tr> <td><a>50</a></td> </tr></table>document.getElementById('bbb').focus(); 焦点就是这样设置的啊,你在addClass就可以了,设成有背景的 关于页面的拖动功能 下拉菜单 调用函数的问题,我就是不会 真受不了,这个form如何提交? 强烈要求版主扣除我的专家分 麻烦大家帮我看看四舍五入的问题!急呀!!! 十万火急 图像、文字的超链接问题? 为什么保存不了呢? 如何使一个页面只能被打开一次且在此页面不被关闭的情况下再次打开时此页面不刷新? jquery 如何更改类名 一个javascript的排序问题
<tr>
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<td>2</td>
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<td>3</td>
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<td>4</td>
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<td>30
<input name="bbb" type="text" id="bbb" /></td>
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<td>39</td>
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<td>40</td>
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<td>41</td>
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<td>42</td>
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<td>43</td>
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<td>44</td>
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<td>45</td>
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<td>46</td>
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<td>47</td>
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<td>48</td>
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<td>49</td>
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<td><a>50</a></td>
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</table>
document.getElementById('bbb').focus();