我一直在想。当使用iMA()或任何其他指示函数时,我使用Symbol()作为第一个参数。例如,
PHP代码:<span style =“color:#000000”> <span style =“color:#0000BB”> doubleEMAHighValue </span> <span style =“color:#007700”> = </span> < span style =“color:#0000BB”> iMA </span> <span style =“color:#007700”>(</span> <span style =“color:#0000BB”>符号</span> <span style =“color:#007700”>(),</span> <span style =“color:#0000BB”> 0 </span> <span style =“color:#007700”>,</span> <span style =“color:#0000BB”> EMAHigh </span> <span style =“color:#007700”>,</span> <span style =“color:#0000BB”> 0 </span> <span style =颜色:#007700“>,</span> <span style =”color:#0000BB“> MODE_EMA </span> <span style =”color:#007700“>,</span> <span style =”color: #0000BB“> PRICE_HIGH </span> <span style =”color:#007700“>,</span> <span style =”color:#0000BB“> 1 </span> <span style =”color:#007700 “>);
</span> <span style =“color:#0000BB”> </span> </span> </code>如果我将NULL替换为Symbol(),会有什么区别?
感谢其他程序员。
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