javascript - JS function to remove tag -

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मैंने निम्न जेएस कोड का उपयोग करके TinyMCE को एक बटन जोड़ा है: 

  (function ( ) {Tinymce.PluginManager.add ('button_span', फ़ंक्शन (एडिटर, url) {editor.addButton ('button_span', {text: 'test button', आइकन: गलत, ऑनक्लिक: फ़ंक्शन () {editor.selection.setContent ('& Lt; em & gt;' + editor.selection.getContent () + '& lt; / em & gt;');}});});}) ();   
 इसलिए, जब उपयोगकर्ता बटन को क्लिक करता है, तो यह  और    टैग में किसी हाइलाइट शब्द को लपेटता है  
 मेरा प्रश्न यह है कि, मैं इसे कैसे बनाऊं ताकि अगर हाइलाइट किए गए शब्द पहले से ही  & lt; em & gt;  टैग में हैं, तो इसे  हटाएं  टैग। मुझे लगता है कि हम onclick फ़ंक्शन को समायोजित करने की आवश्यकता है।   
 
 
 शायद यह एक शॉट दे। मैं छोटे एमईसी से बहुत परिचित नहीं हूं लेकिन यह सामान्य रूप से काम करना चाहिए। इसके अलावा, आप इसे देखने के लिए इसका विस्तार करना चाहते हैं, यह देखने के लिए कि क्या कोई भी '' है, और इसके आधार पर अलग-अलग होंगे, यह आपको शुरू करना है, लेकिन जैसा कि मैंने कहा, यह आपके आधार का आधार होना चाहिए मुझे ऐसा करने की कोशिश कर रहा हूं।  
  onclick: फ़ंक्शन () {var content = editor.selection.getContent (); यदि (contents.indexOf ('& lt; em & gt;') & gt; = 0) {contents.replace ('& lt; em & gt;', ''); सामग्री। स्थान ('& lt; / em & gt;', ''); editor.selection.setContent (सामग्री); } अन्य {editor.selection.setContent ('& lt; em & gt;' + editor.selection.getContent () + '& lt; / em & gt;'); }}

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