In HTML, a connect contact publication form Submission

<! doctype html public  "-//w3c//dtd xhtml 1.0 transitional//en"   "HTTP// Www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd "> 
???? note: the href attribute in the 
 ①a connection cannot be empty. Cannot be a URL address (null equals URL is the URL address of this script), this will be submitted to the form form the action, and then jump to the address specified in the a tag, even if the hyperlink address in the A tag and the form form the same URL address, you can not get the value of the form form Span style= "Display:none; line-height:0px; " >?          
 
(I guess) because this is the equivalent of two times to enter the page: the first is to jump through the form, the second is through a tag jump. The second jump clears the post so it doesn't get a value.
 
② Although the form submission is triggered by JS, the form tag must also have <input type = "Submit" .../>
 
③JS triggers a commit in two ways: the Submit () that triggers the form; Event | | The Click () event that triggers the Submit button. Two of them. I tried it.  
 
? ? ? ? ? ? ? ? ? ? ? ?
In HTML, a connect contact publication form Submission