Question

explain differences for alert, console.log, document.write

illustrate with examples

Javascript Html

Answer 1

1. Console.log

Example:

console.log("print log")

This is going to output 'print log' on your console. So, basically, it takes a parameter, and outputs that parameter to the console. It is often used by developers for debugging. They can log useful information using this javascript function that helps them to debug their code.

Elements Console Debugger Ne All Errors Warnings Info Logs d o HTML1300: Navigation occurred. A HTML1527: DOCTYPE expected. Consider A HTML1407: Invalid tag name. First cha A HTML1513: Extra "html>" tag found. On print log

2. document.write()

Example:

document.write("<p> Adding a paragraph using document.write() </p>")

has the capability to add to the HTML using javascript. In this case, it adds a new paragraph element to the html. Hence, document.write() modifies the DOM, but console.log does not.

Adding a paragraph using document.write()

3. alert()

Example:

alert("Hi!! This is an alert message")

alert is a pop-up message window that appears on the browser window. The appearance of the browser window is specific to a browser. It may also be sometimes used for detecting small errors that occur in javascript by putting an alert window at steps that may be causing error. This, however is not of much help. Alert can be used for passing message to the user.

X This site says... Hi!! This is an alert message OK