html - javascript and div ids -

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अगर मेरे पास html फ़ाइल में निम्नलिखित कोड है 

  & lt; div id = div1 & gt ; & Lt; स्क्रिप्ट प्रकार = "टेक्स्ट / जावास्क्रिप्ट" & gt; externalFunction (); & Lt; / स्क्रिप्ट & gt; 
 
 
 
 
 
 
 
 
 
 Div> 
 
 
 आप आईडी का मतलब है? नाम अलग है संक्षिप्त जवाब नहीं है, लंबे समय तक उत्तर आप कर सकते हैं यदि आप उस div के बारे में कुछ जानते हैं जिसे आप देख रहे हैं (जैसे कक्षा या जहां यह स्थित है या कुछ और।)

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