颜色 16进制rgb互转

//颜色 16进制转rgb
function hexToRgb(hex) {
    let color = [], rgb = [];
    hex = hex.replace(/#/, "");

    if (hex.length == 3) { // 处理 "#abc" 成 "#aabbcc"
        let tmp = [];

        for (let i = 0; i < 3; i++) {
            tmp.push(hex.charAt(i) + hex.charAt(i));
        }

        hex = tmp.join("");
    }

    for (let i = 0; i < 3; i++) {
        color[i] = "0x" + hex.substr(i + 2, 2);
        rgb.push(parseInt(Number(color[i])));
    }

    return 'rgb(' + rgb.join(",") + ')';
};

//颜色 rgb转16进制
function rgbTohex(color) {
    let rgb;

    if (color.indexOf("rgba") > -1) {
        rgb = color.replace("rgba(", "").replace(")", "").split(',');
    }
    else {
        rgb = color.replace("rgb(", "").replace(")", "").split(',');
    }

    let r = parseInt(rgb[0]);
    let g = parseInt(rgb[1]);
    let b = parseInt(rgb[2]);

    let hex = "#" + ((1 << 24) + (r << 16) + (g << 8) + b).toString(16).slice(1);

    return hex;
};