The example in this article describes the method of obtaining form in js. Share it with everyone for your reference. The details are as follows:
Let’s look at the following code first:
<html> <head> <scirpy> window.onload=function(){ var f1=document.f1; var f2=document.forms[1]; alert(f2.id); var f3=document.forms['f1']; } </script> </head> <body> <form id="f1" value="f1"></from> <from id="f2" value="f2"></form> </body> </html>
Operation form:
<html> <head> <script> function checkform(f){ var uname=f.username; var pwd=f.password; if(uname.value.length<4){ alert('用户长度必须大于4'); return false; } if(pwd.value.length!=6){ alert('用户密码必须大于 6位'); return false; } return true; } </script> </head> <body> <form id="f1" name="f1" method="post" action="" onsubmit="return checkform(this)"> <input name="username" value="" /></br> <input name="password" value="" /></br> <input type="button" value="提交" /> </form> </body> </html>
Three ways to operate forms with js:
1. Use the index of the form in the document or the name attribute of the form to reference the form
document.forms[fromName] //Get the form of the corresponding name in the page
2. Use the id attribute of the form
3.
I hope this article will be helpful to everyone’s JavaScript programming design.

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