Web_dev_learn/class13.html at main · Allwina/Web_dev_learn · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Class 13</title>
</head>
<body>
    <script>
        // Global scope: accessed anywhere in program
        var var1="Lily"
        let let1="Bobby"
        const const1="City"
        // difference between var and let
        //let can be acessed only inside block scope
        //const can't be redeclared or reassigned
        //  Functional scope: Accesed only inside a function
        function Data()
        {
            var a=10
            let b=20
            const c=30
            console.log(a)
            //block scope:only var can be acessed outside
            if(30>20)
            {
                let e="End task"
                var f="Function"
                const pi=3.14
                console.log(pi)
            }
            //comparison
            var comp=a
            console.log(2==2)
            console.log(2==="2")
            //array
            //homogeneous
            var myarray=["Data","Details","Status"]
            //heterogenous-> different datatypes
            var array2=["da",1,746378.4,true]
            console.log(myarray)
            console.log(array2)
            //Index Number-> PRINTING individual data
           console.log(myarray[0])
           console.log(array2[0])
        }
        Data()
        // console.log(let1)
        //= assignment
        //==compare
        //===compare value and data type
        if(5>10)
        {
            console.log("The data is correct")
        }
        else{
            console.log("The data is incorrect")
        }
        var username=prompt("Enter the user ")
        var password=prompt("Enter the pass")
        if(username=="admin" && password=="pass")
        {
            console.log("You are logged in")
        }
        else{
            console.log("Enter the correct credentials")
        }
        // for loop
        for(i=0;i<10;i++)
        {
        console.log("The value of count is"+i)
        }
        function fizzBuzz()
        {
            for(let i=1;i<=10;i++)
            {
                if(i%3==0)
                {
                    console.log('Fizz')

                    if(i%5==0)
                    {
                        console.log('Buzz')
                    }
                    if(i%3==0 && i%5==0)
                    {
                        console.log('FizzBuzz')
                    }
                }
                else
                {
                    console.log(i)
                }
            }
        }
        fizzBuzz()
        // OBJECT :consist of key and value
        let object1={
            Brand:"Asus",
            Model:2163,
            RAM:"128GB",
            color:"white"
        }
        console.log(object1)
        console.log(object1.Brand)

    </script>
</body>
</html>
<!-- DOM :Document Object Model is an API for HTML and XML -->
<!-- DOM Selectors:select HTML elements within a document using javascript -->
<!-- 5 ways -->
<!-- 1.getElementsByTagName()
2.getElementsByClassName()
3.getElementsById()
4.querySelector()
5.querySelectorAll() -->