LEFT

<h3 style="margin-left:64px">1.1.1.1<span style="font:9px &#39;Times New Roman&#39;">&nbsp; </span>1.1.1.2 LEFT</h3><p style="margin-top:13px;line-height:118%">该函数功能是获取源字符串中从左边开始的部分字符。输入变量 STR 为 STRING 类型，SIZE 为 INT 类型，返回值为 STRING 类型。</p><p style="margin-top:9px"><span style="font-family:&#39;Arial&#39;,&#39;sans-serif&#39;">LEFT (STR, SIZE) </span>意思是：获取从字符串 <span style="font-family:&#39;Arial&#39;,&#39;sans-serif&#39;">STR </span>左边开始，长度为 <span style="font-family:&#39;Arial&#39;,&#39;sans-serif&#39;">SIZE </span>的部分字符。</p><p style="margin-top:0"><span style="font-size: 8px;font-family:宋体">&nbsp;</span></p><p><span style="font-family:&#39;Arial&#39;,&#39;sans-serif&#39;">FBD </span>中示例：</p><p style="margin-top:0"><span style="font-size: 10px;font-family:宋体">&nbsp;</span></p><p style="margin-left:179px;line-height:79px"><img src="/upload/article/20230611/1686449788443493.png" title="1686449788443493.png" alt="image.png"/></p><p style="margin-top:1px"><span style="font-size: 10px;font-family:宋体">&nbsp;</span></p><p><span style="font-family:&#39;Arial&#39;,&#39;sans-serif&#39;">ST </span>中示例：</p><p style="margin-top:0"><span style="font-size: 10px;font-family:宋体">&nbsp;</span></p><p style="margin-top:0;margin-right:7px;margin-bottom:0;margin-left:0;margin-bottom:0;text-align:center"><span style="font-family:&#39;Arial&#39;,&#39;sans-serif&#39;">VarSTRING1 := LEFT (&#39;SUSI&#39;,3);</span></p><p><br/></p>