display only 30 characters of a long string javascript in array

<!--display only 30 characters of a long string javascript in array--> <script> //<![CDATA[ var str=document.getElementsByClassName("post-title"); for (let i = 0; i < str.length; i++) { var astr=str[i].getElementsByTagName("a")[0].innerText; if(astr.length > 18){ astr2 = astr.substring(0,15) + "..."; str[i].getElementsByTagName("a")[0].innerText=astr2; } else{ str[i].getElementsByTagName("a")[0].innerText=astr; } } //]]> </script> <!--display only 30 characters of a long string javascript in array-->

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