HTML如何自动选择复选框？ [英] HTML How to auto select a check box?

问题描述

我有以下HTML代码：

 < table border = 0 cellpadding = 5> 
 
< tr> 
< td>< input type =checkboxname =all_sizesvalue =All> All< br>< / td> 
< td>< input type =checkboxname =10mmvalue =10mm> 10mm< br>< / td> 
< td>< input type =checkboxname =20mmvalue =20mm> 20mm< br>< / td> 
< td>< input type =checkboxname =30mmvalue =30mm> 30mm< br>< / td> 
< td>< input type =checkboxname =40mmvalue =40mm> 40mm< br>< / td> 
< / tr> 
< / table> 
  

默认情况下，我们将如何选择第一个复选框？

 < td>< p> input type =checkboxname =all_sizesvalue =All> All< br>< / td> 
  

到此处（添加关键字'checked'）：

 < td>< input type =checkboxname =all_sizesvalue =Allchecked>全部< br>< / td> 
  

I have the following HTML code:

<table border = 0 cellpadding=5 >

<tr>
<td><input type="checkbox" name="all_sizes" value="All">All<br></td>
<td><input type="checkbox" name="10mm" value="10mm">10mm<br></td>
<td><input type="checkbox" name="20mm" value="20mm">20mm<br></td>
<td><input type="checkbox" name="30mm" value="30mm">30mm<br></td>
<td><input type="checkbox" name="40mm" value="40mm">40mm<br></td>
</tr>
</table>

How would we go about selecting the first check box by default?

解决方案

Change this:

<td><input type="checkbox" name="all_sizes" value="All">All<br></td>

to this (add the keyword 'checked'):

<td><input type="checkbox" name="all_sizes" value="All" checked>All<br></td>

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