1function alpha(value, color) { 2 return value << 24 | (color & 0x00FFFFFF); 3} 4 5function argb(a, r, g, b) { 6 return a << 24 | r << 16 | g << 8 | b; 7} 8 9function assert(condition) { 10 if (!condition) debugger; 11} 12 13function isAlpha(code) { 14 return (code > 64 && code < 91) // upper alpha (A-Z) 15 || (code > 96 && code < 123); // lower alpha (a-z) 16} 17 18function isArray(a) { 19 return a.constructor === Array; 20} 21 22function rgb(r, g, b) { 23 return 0xFF << 24 | r << 16 | g << 8 | b; 24} 25