Convert RGB to Hex color

Below is a function to convert rgb to hex color. But it is not totally correct. With (0, 255, 0) (#00ff00). it return ff00 and so it is not valid color. I need help to modify it to return correct hex value.

function rgbToHex(r, g, b) {
        var rgb = b | (g << 8) | (r << 16);
        return rgb.toString(16);
    }

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这个怎么样：

//...
return (0x1000000 | rgb).toString(16).substring(1);

---

尝试这个：

return ("000000"+rgb.toString(16)).slice(-6);
//                                   ^----returns last 6 chars

---

return ((b | g << 8 | r << 16) / 16777216).toString(16).substring(2);

要么

return ((b | g << 8 | r << 16) / 0x1000000).toString(16).substring(2);

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