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function tc()
{
var xm=document.getElementById("xm").value;
var mobile=document.getElementById("mobile").value;
var jiadian=document.getElementById("jiadian").value;
var pijiu=document.getElementById("jiu").value;
var chicken=document.getElementById("chicken").value;
if((xm==""||xm.length<2)||(mobile=="" ||mobile.length<11)||jiadian=="" || pijiu=="" || chicken=="")
{
window.alert("联系方式请填写正确且商品不能为空");
return false;
}
else
{
window.alert("提交成功!");
}
}
<form action="message.php" method="post" >
<table>
<tr>
<td>姓名:</td>
<td><input type="text" name="xm" id="xm"/></td>
<td><input type="radio" name="sex" value="man" />男</td>
<td><input type="radio" name="sex" value="woman" />女</td>
</tr>
<tr>
<td>手机:</td>
<td><input type="text" name="mobile" id="mobile"/></td>
<tr/>
<tr>
<td>选择你要购置的礼品:</td>
</tr>
<tr>
<td><input type="checkbox" name="jiadian" value="家电" id="jiadian"/>空调</td>
<td><input type="checkbox" name="jiu" value="啤酒" id="jiu"/>啤酒</td>
<td><input type="checkbox" name="chicken" value="炸鸡" id="chicken"/>炸鸡</td>
<tr/>
<tr>
<td>留言:</td>
<td><textarea style="resize:none;"></textarea></td>
<tr/>
<tr>
<td colspan="3" >
<div align="center">
<input type="submit" name="提交" value="提交" onclick="return tc()"/>
</div>
<td/>
<tr/>
</table>
</form>