类型转换函数
<p>1.数值和字符串转换</p>
<table>
<thead>
<tr>
<th>函数</th>
<th>功能</th>
<th>示例</th>
<th>备注</th>
</tr>
</thead>
<tbody>
<tr>
<td>StrToIntDef</td>
<td>字符串->整型(带默认值)</td>
<td>StrToIntDef('abc',0)->0</td>
<td>转换失败时返回默认值</td>
</tr>
<tr>
<td>TryStrToInt</td>
<td>尝试字符串->整数</td>
<td>TryStrToInt('100',i)->True</td>
<td>安全转换，返回布尔值表示是否成功</td>
</tr>
<tr>
<td>FloatToStr</td>
<td>浮点数->字符串</td>
<td>FloatToStr(3.14）->'3.14'</td>
<td>基础类型转换</td>
</tr>
<tr>
<td>FloatToStrF</td>
<td>格式化浮点数->字符串</td>
<td>FloatToStrF(3.1415,ffFixed,5,2）->'3.14'</td>
<td>支持指定格式和精度</td>
</tr>
<tr>
<td>FormatFloat</td>
<td>浮点数格式化输出</td>
<td>FormatFloat('0.00',3.1415)->'3.14'</td>
<td>简化版FloatToStrF</td>
</tr>
<tr>
<td>StrToFolat</td>
<td>字符串->浮点数</td>
<td>StrToFolat('3.14')->3.14</td>
<td></td>
</tr>
<tr>
<td>StrToFolatDef</td>
<td>字符串->浮点数（带默认值）</td>
<td>StrToFolatDef('abc',0.0)->0.0</td>
<td>转换失败时返回默认值</td>
</tr>
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