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Can you tell me the explanation about code in below? Especially the value of num when num--(start)

var images = [ 'http://www.sololearn.com/uploads/slider/1.jpg', 'http://www.sololearn.com/uploads/slider/2.jpg', 'http://www.sololearn.com/uploads/slider/3.jpg' ]; var num = 0; function next() { var slider = document.getElementById('slider'); num++; if(num >= images.length) { num = 0; } slider.src = images[num]; } function prev() { var slider = document.getElementById('slider'); num--; if(num < 0) { num = images.length-1; } slider.src = images[num]; }

18th May 2019, 4:33 PM
SALIM
1 Antwort
+ 3
// Declare and initialize variable // <nums> with zero var num=0; function prev() { var slider = document.getElementById('slider'); // Decrement value of <nums> num--; // If value of <nums> less than zero // let <nums> value be the last index // of array <images> if(num < 0) { num = images.length-1; } // Set the image source for the img // element <slider> to the URL // stored in array <images> at index // <num> slider.src = images[num]; } P.S. Please add JavaScript to Relevant Tags. (Edit) OP changed the embedded code.
18th May 2019, 4:47 PM
Ipang