javascript - window.postMessage behaves abnormal on Chrome extension -

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मैं क्रोम एक्सटेंशन सामग्री स्क्रिप्ट में window.postMessage का उपयोग करता हूं: 

  फ़ंक्शन () {विंडो .addEventListener ("संदेश", फ़ंक्शन (ईवेंट) {console.log (ईवेंट);}, झूठी); Window.postMessage ({प्रकार: \ "FROM_PAGE \"}, "*")}}   
 असामान्य व्यवहार यह है कि पहली बार मैं इस फ़ंक्शन को कॉल करता हूं, एक बार सांत्वना प्रिंट ईवेंट; दूसरी बार मैं कॉल करता हूँ, कंसोल प्रिंट दो बार; तीसरी बार, तीन बार। 
 मेरे कोड में क्या गलत है?   
 
 
 ऐसा इसलिए है क्योंकि आप  नया  ईवेंट लिस्टनर  प्रत्येक  समय को जोड़ने से आप  फ़ंक्शन कॉल कर सकते हैं।   
 इस प्रकार आपके द्वारा जोड़े गए सभी EventListener को पोस्ट किया गया संदेश  पोस्टमेस  और फिर करता है  
  console.log (इवेंट)   
 इसलिए पहली बार जब आप कॉल करते हैं फ़ंक्शन। आप  EventListeners  फ़ंक्शन को केवल एक बार निष्पादित कर लेते हैं क्योंकि केवल  1   EventListener  उस DOM से जुड़ा हुआ है जो कॉल करता है  console.log   
 दूसरी बार दो  EventListeners  चलाना है  console.log  और इसी तरह ...  
 आपको संलग्न करना चाहिए आप  EventListener   
  window.addEventListener ("संदेश", फ़ंक्शन (ईवेंट) {...}   
 अपने फ़ंक्शन के बाहर .और केवल  window.postMessage ({प्रकार: \ "FROM_PAGE \"}, "*") करें;  फ़ंक्शन के अंदर का हिस्सा

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