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How does javascript determine whether the entered url is correct?

Source: Internet
Author: User
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There are too many advertisements on the original webpage, which affects your mood.
Copy codeThe Code is as follows:
<Html>
<Head>
<Title> check whether the URL is used </title>
<Script language = "javascript">
Function check (){
Str = form1.txt. value;
Str = str. match (/http: \/. + /);
If (str = null ){
Alert ('invalid URL you entered ');
Return false;
} Else {
Alert ("the URL you entered is valid ");
Return true;
}
}
</Script>


</Head>
<Body>
<Form name = "form1" onSubmit = "return check ()">
<Input type = "text" name = "txt">
<Input type = "submit" value = "test">
</Form>
</Body>
</Html>

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