Trending October 2023 # Internal &Amp; External Javascript: Learn With Example # Suggested November 2023 # Top 18 Popular | Dacquyenphaidep.com

Trending October 2023 # Internal &Amp; External Javascript: Learn With Example # Suggested November 2023 # Top 18 Popular

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You can use JavaScript code in two ways.

You can either include the JavaScript code internally within your HTML document itself

You can keep the JavaScript code in a separate external file and then point to that file from your HTML document.

What is Internal JavaScript?

We have been using Internal JS so far. Here is a sample –

var day = new Date(); var today = day.getDay(); var weekday = new Array(7); weekday[0]=”Sunday”; weekday[1]=”Monday”; weekday[2]=”Tuesday”; weekday[3]=”Wednesday”; weekday[4]=”Thursday”; weekday[5]=”Friday”; weekday[6]=”Saturday”; document.write(“Today is ” + weekday[today] + “.”);

What is External JavaScript?

You plan to display the current date and time in all your web pages. Suppose you wrote the code and copied into all your web pages (say 100). But later, you want to change the format in which the date or time is displayed. In this case, you will have to make changes in all the 100 web pages. This will be a very time consuming and difficult task.

So, save the JavaScript code in a new file with the extension .js. Then, add a line of code in all your web pages to point to your .js file like this:

Note: It is assumed that the .js file and all your web pages are in the same folder. If the chúng tôi file is in a different folder, you need to specify the full path to your file in the src attribute.

How to link external JavaScript

var currentDate = new Date(); var day = currentDate.getDate(); var month = currentDate.getMonth() + 1; var monthName; var hours = currentDate.getHours(); var mins = currentDate.getMinutes(); var secs = currentDate.getSeconds(); var strToAppend; { hours1 = "0" + (hours - 12); strToAppend = "PM"; } else if (hours <12) { hours1 = "0" + hours; strToAppend = "AM"; } else { hours1 = hours; strToAppend = "PM"; } if(mins<10) mins = "0" + mins; if (secs<10) secs = "0" + secs; switch (month) { case 1: monthName = "January"; break; case 2: monthName = "February"; break; case 3: monthName = "March"; break; case 4: monthName = "April"; break; case 5: monthName = "May"; break; case 6: monthName = "June"; break; case 7: monthName = "July"; break; case 8: monthName = "August"; break; case 9: monthName = "September"; break; case 10: monthName = "October"; break; case 11: monthName = "November"; break; case 12: monthName = "December"; break; } var year = currentDate.getFullYear(); var myString; document.write(myString);

This is your chúng tôi file. Don’t worry seeing long lines of code. You will learn to code soon. Make changes to your HTML document like this:

When to Use Internal and External JavaScript Code?

If you have only a few lines of code that is specific to a particular webpage, then it is better to keep your JavaScript code internally within your HTML document.

On the other hand, if your JavaScript code is used in many web pages, then you should consider keeping your code in a separate file. In that case, if you wish to make some changes to your code, you just have to change only one file which makes code maintenance easy. If your code is too long, then also it is better to keep it in a separate file. This helps in easy debugging.

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