<p>چرا من اینجا وقتی [<span class=\"hljs-title class_\">Symbol</span>.<span class=\"hljs-property\">isConcatSpreadable</span>] رو اضافه کردم:</p><pre class=\"ql-syntax\" spellcheck=\"false\">        <span class=\"hljs-tag\"><<span class=\"hljs-name\">script</span>></span><span class=\"hljs-meta\">             \'use strict\'</span>             <span class=\"hljs-keyword\">let</span> myOb = {                 <span class=\"hljs-number\">0</span>: <span class=\"hljs-string\">\'Java\'</span>,                 <span class=\"hljs-number\">1</span>: <span class=\"hljs-string\">\'Python\'</span>,                 <span class=\"hljs-attr\">name</span>: <span class=\"hljs-string\">\'Helen\'</span>,                 [<span class=\"hljs-title class_\">Symbol</span>.<span class=\"hljs-property\">isConcatSpreadable</span>]: <span class=\"hljs-literal\">true</span> <span class=\"hljs-comment\">//*</span>             };             <span class=\"hljs-keyword\">let</span> message = [<span class=\"hljs-string\">\'myList\'</span>].<span class=\"hljs-title function_\">concat</span>(myOb);             <span class=\"hljs-variable language_\">console</span>.<span class=\"hljs-title function_\">log</span>(message); <span class=\"hljs-comment\">//before adding * output: [\'myList\', object]</span>         <span class=\"hljs-tag\"></<span class=\"hljs-name\">script</span>></span> </pre><p><span style=\"color: rgb(156, 220, 254);\"> در حروجی فقط:</span></p><pre class=\"ql-syntax\" spellcheck=\"false\">[<span class=\"hljs-string\">\'myList\'</span>] </pre><p>رو نمایش داد؟</p>