JavaScript quick info basic

//JavaScript quick info basic
console.log(); <!-- Only For Developer Mode -->

window.document.write();

document.write();

window.confirm();

confirm();

window.alert();

alert();


window.document.getElementById();

document.getElementById();

window.document.getElementById("id here").innerHTML = value;

document.getElementById("demo").innerHTML = "Paragraph changed.";


<!-- Long Distance traverse -->
innerHTML

tagName


console.log(contentDiv.innerHTML);
document.write(contentDiv.tagName);

prompt('Please Input Data'); // this same <input /> and will display popup

window.prompt('insert text'); //this same <input/> and will display popup

parseInt // here parseInt has been used indicate to integer (as a number)

addEventListener // usage like btnChangeText.addEventListener('click',name of function,false);


<!-- using array literal in JavaScript -->
var array_number = [1,2,3,4,5,6,7,8,9,'Hello World!']; // array literal
window.document.write(array_number[0]); // when will go out of the range then will show undefine

length
window.document.write(array_number.length);


There are 2 types of literal . 1 is array literal and 2 is object literal


<!-- The Below Example Is json Formate where will stay [] and data will do into it as an object literal-->
[
  {name: 'Afghanistan', code: 'AF'},
  {name: 'Åland Islands', code: 'AX'},
  {name: 'Albania', code: 'AL'}
]

<!--  -->
<script>
// window.name = Firstname LastName;

// var name = 'H T';

name = 'another H T';

// this.alert(this);

// window.alert(this);

// window.confirm('Are you sure?');

// window.document.write('Hellow World');

// window.document.writeln('Hello World');

// console.log('hello');

// this.console.log('hello');

// alert(name);

// this.console.log(window.name);

/*
null is object
true or false boolean
1,2....etc like this is  number
anything in '' or "" that are string
like this 555555555555555*'abc' is NaN but a number
*/

var what_type = 555555555555555*'abc';

console.log(what_type);
console.log(typeof what_type);


</script>