css random effects color change
// Code By Webdevtrick ( https://webdevtrick.com )
changeContrast();
function changeContrast() {
var R, G, B, C, L;
$( "li" ).each(function() {
R = (Math.floor(Math.random() * 256));
G = (Math.floor(Math.random() * 256));
B = (Math.floor(Math.random() * 256));
$( this ).css( 'background-color', 'rgb(' + R + ',' + G + ',' + B + ')' );
C = [ R/255, G/255, B/255 ];
for ( var i = 0; i < C.length; ++i ) {
if ( C[i] <= 0.03928 ) {
C[i] = C[i] / 12.92
} else {
C[i] = Math.pow( ( C[i] + 0.055 ) / 1.055, 2.4);
}
}
L = 0.2126 * C[0] + 0.7152 * C[1] + 0.0722 * C[2];
if ( L > 0.179 ) {
$( this ).css( 'color', 'black' );
} else {
$( this ).css( 'color', 'white' );
}
});
}