javascript - Class selector returns null when I test -

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मेरे पास सेट एचटीएमएल का एक स्निपर है I मूल संरचना 

  & lt; div & gt; & Lt; div & gt; & lt; / div & gt; & Lt; div वर्ग = "कुछ-वर्ग अन्य-श्रेणी टिकट_प्रिंट_वेपर दृश्यमान" & gt; & lt; / div & gt; & Lt; / div & gt;   
 इसलिए मैं कोड के माध्यम से एक और बटन डालने की कोशिश कर रहा हूं। ऐसा करने के लिए, मैं (अब तक कुटिलता से) का उपयोग कर रहा हूं:  
  $ ("। Ticket_print_wrapper")। InsertAfter ("& lt; p & gt; moo & lt; / p & gt;");   
 यहां एक jsfiddle है:  
 यह एक वस्तु के रूप में  "। टिकट / प्रिंट" /  स्वीकार नहीं करता है। क्या कोई इस पर मेरी नींद पीड़ा को तोड़ सकता है? कृपया   
 
 
 का प्रयोग करें  $ ("। ") .append (" & lt; p & gt; moo & lt; / p & gt; ");  यदि आप दो बटन के साथ एक और सामग्री जोड़ना चाहते हैं।

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