simple steps javascript code example

Example 1: javascript steps

// now I want to calculate the lefted seats 

data.prototype.leftedSeats=function() //Acsses the constructor
{
    
    this.lefted = this.capacity-this.reserve ;

}

data.prototype.leftedSeats();

Example 2: javascript steps

//define the html form in JS
var formEl = document.getElementById("form");
var allData=[];