The code doesnt work me to debug the error

There is a form and the form validation is done through JavaScript.
While clicking submit the JavaScript function should get executed but it doesn’t.

<form id="form"  onsubmit="return validation()" target="_top" action="submission.html">

    <label for="name">Name<span style="color:red;">*</span>:</label>
    <input type="text" id="name" name="name"><br><br>

    <label for="add">Address<span style="color:red;">*</span>:</label>
    <input type="text" id="add" name="address"><br><br>

    <label for="zip">Zip Code<span style="color:red;">*</span>:</label>
    <input type="text" id="zip" name="zip"><br><br>

    <label for="country">Country<span style="color:red;">*</span>:</label>
    <select id="country" name="country">
    <option value="">Please select</option>
    <option value="india">india</option>
    <option value="US">US</option>

    <p>Gender:<span style="color:red;">*</span>
    <input type="radio" id="male" name="gender" value="male">
    <label for="male">Male</label>
    <input type="radio" id="female" name="gender" value="female">
    <label for="female">Female</label>

    <p>Preferences:<span style="color:red;">*</span>
    <input type="checkbox" id="colour1" name="red" value="red">
    <label for="colour1">Red</label>
    <input type="checkbox" id="colour2" name="green" value="green">
    <label for="colour2">Green</label>
    <input type="checkbox" id="colour3" name="blue" value="Blue">
    <label for="colour3">Blue</label>

    <label for="phone">Phone<span style="color:red;">*</span>:</label>
    <input type="phone" id="phone" name="phone"><br><br>

    <label for="email">Email<span style="color:red;">*</span>:</label>
    <input type="email" name="email" id="email"><br><br>

    <label for="pass">Password(6-8 characters)<span style="color:red;">*</span>:</label>
    <input type="text" name="password" id="pass"><br><br>

    <label for="verpass">Verify Password<span style="color:red;">*</span>:</label>
    <input type="text" name="Verfiy Password" id="verpass"><br><br>

    <button type="submit" value="Submit">Submit</button>
    <input type="reset" value="Clear">
      function validation() {
        let zip=document.getElementById("zip").value;

        let email=document.getElementById("email").value;
        let email1=email.slice(-4);
        let index=email.indexof("@");

        let pass=document.getElementById("pass").value;
        let pass1=document.getElementById("verpass").value;

        var form = document.getElementById("form").elements;

           for(var i=0;i<form.length;i++)
            alert(form[i].name+" must not be empty");
            return false;
               alert("Enter a valid zip code");
               return false;
           } else if(email1!=".com"||index==-1)
               alert("Enter a valid email");
               return false;
           } else if(pass.length<6||pass.length>8)
               alert("Enter a valid password");
               return false;
           } else if(pass!=pass1)
               alert("Password doesnt match");
               return false;
           } else
             return true;

Can you tell us more about your problem? It is very hard to help without information about what this chunk of code should do and what it is doing instead.

I’ve edited your post for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.

You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.

See this post to find the backtick on your keyboard.
Note: Backticks (`) are not single quotes (’).

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