vue-fun-loading/lib/utils.js

all kinds of loading components of vue

export const LightenDarkenColor = (col, amt) => {
    let usePound = false;

    if (col[0] === '#') {
        col = col.slice(1);
        usePound = true;
    }

    const num = parseInt(col, 16);

    let r = (num >> 16) + amt;

    if (r > 255) r = 255;
    else if (r < 0) r = 0;

    let b = ((num >> 8) & 0x00FF) + amt;

    if (b > 255) b = 255;
    else if (b < 0) b = 0;

    let g = (num & 0x0000FF) + amt;

    if (g > 255) g = 255;
    else if (g < 0) g = 0;

    return (usePound ? '#' : '') + (g | (b << 8) | (r << 16)).toString(16);
};