16进制颜色转rgb

16进制颜色转rgb

colorRgb = (colorHex, opacity=1) => {
        if (!colorHex) {
            return
        }
        // 16进制颜色值的正则
        var reg = /^#([0-9a-fA-f]{3}|[0-9a-fA-f]{6})$/;
        // 把颜色值变成小写
        var color = colorHex.toLowerCase();
        if (reg.test(color)) {
            // 如果只有三位的值，需变成六位，如：#fff => #ffffff
            if (color.length === 4) {
                var colorNew = "#";
                for (var i = 1; i < 4; i += 1) {
                    colorNew += color.slice(i, i + 1).concat(color.slice(i, i + 1));
                }
                color = colorNew;
            }
            // 处理六位的颜色值，转为RGB
            var colorChange = [];
            for (var i = 1; i < 7; i += 2) {
                colorChange.push(parseInt("0x" + color.slice(i, i + 2)));
            }
            return "RGBA(" + colorChange.join(",") + ',' + opacity + ")";
        } else {
            return color;
        }
    };