Error:“Uncaught SyntaxError: Identifier 'Common' has already been declared after making javascript class object” in console?

Question

class Common
{
   constructor(){
    this.URL=location.protocol + '//' + location.host+'';
   }

    showOk(){
    console.log('ok');
    }

}
const commn=new Common();

Here is my html codes that I've tried to call the showOk() function.

<button type="button" class="btn btn-01 btn-checkout-login ml-auto w-100 text-center" onclick="return commn.showOk();" ;="">Continue Checkout</button>

<button type="button" class="btn btn-01 btn-checkout-login ml-auto w-100 text-center" onclick="commn.showOk();" ;="">Continue Checkout</button>

Answer 1

Hello,

You can write like this, you need know, class's instance's function is different with normal function.

<button onclick="handleClick();">click</button>

<script >

class Common {
   constructor(){
    this.URL=location.protocol + '//' + location.host+'';
   }

    showOk(){
     console.log('ok');
    }

}
const common = new Common();

function handleClick() {
  common.showOk();
}
</script>