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The strange problem of dynamically creating elements in JS-to be resolved

Source: Internet
Author: User
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Yesterday, when I used js to dynamically create elements, a strange problem occurred. Let's see who can help solve it.

HtmlCode:

<HTML>  

When the DIV in HTML is<Div id = "M"> </div>Run the following results:
 


When the DIV in HTML is<Div id = "M"/>Run the following results:
 

 

Why? Who will help solve the problem.

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