function getRandomInt(min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
}
var RGB = { R: getRandomInt(0, 255), G: getRandomInt(0, 255), B: getRandomInt(0, 255) }
function rgbToHsl_(r, g, b) {
r /= 255, g /= 255, b /= 255;
var max = Math.max(r, g, b), min = Math.min(r, g, b);
var h, s, l = (max + min) / 2;
if (max == min) {
h = s = 0;
} else {
var d = max - min;
s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
switch (max) {
case r:
h = (g - b) / d + (g < b ? 6 : 0);
break;
case g:
h = (b - r) / d + 2;
break;
case b:
h = (r - g) / d + 4;
break;
}
h /= 6;
}
return [ h, s, l ];
}
function rgbToHsl(rgb) {
var R = rgb.R / 255;
var G = rgb.G / 255;
var B = rgb.B / 255;
var Cmax = Math.max(R, G, B);
var Cmin = Math.min(R, G, B);
var delta = Cmax - Cmin;
var L = (Cmax + Cmin) / 2;
var S = 0;
var H = 0;
if (delta !== 0) {
S = delta / (1 - Math.abs((2 * L) - 1));
switch (Cmax) {
case R:
H = ((G - B) / delta) % 6;
break;
case G:
H = ((B - R) / delta) + 2;
break;
case B:
H = ((R - G) / delta) + 4;
break;
}
H *= 60;
}
while (H < 0) {
H += 360;
}
return {
H: H,
S: S,
L: L
};
};
function rgbToHslIfElse(rgb) {
var R = rgb.R / 255;
var G = rgb.G / 255;
var B = rgb.B / 255;
var Cmax = Math.max(R, G, B);
var Cmin = Math.min(R, G, B);
var delta = Cmax - Cmin;
var L = (Cmax + Cmin) / 2;
var S = 0;
var H = 0;
if (delta !== 0) {
S = delta / (1 - Math.abs((2 * L) - 1));
if (Cmax === R) {
H = ((G - B) / delta) % 6;
} else if (Cmax === G) {
H = ((B - R) / delta) + 2;
} else if (Cmax === B) {
H = ((R - G) / delta) + 4;
}
H *= 60;
}
while (H < 0) {
H += 360;
}
return {
H: H,
S: S,
L: L
};
};
function rgbToHslOptimized(rgb) {
var R = rgb.R / 255;
var G = rgb.G / 255;
var B = rgb.B / 255;
var Cmax = Math.max(Math.max(R, G), B);
var Cmin = Math.min(Math.min(R, G), B);
var delta = Cmax - Cmin;
var S = 0;
var H = 0;
var L = (Cmax + Cmin) / 2;
var res = {
H: 0,
S: 0,
L: L
}
var remainder = 0;
if (delta !== 0) {
S = delta / (1 - Math.abs((2 * L) - 1));
switch (Cmax) {
case R:
H = ((G - B) / delta) % 6;
break;
case G:
H = ((B - R) / delta) + 2;
break;
case B:
H = ((R - G) / delta) + 4;
break;
}
H *= 60;
}
if (H < 0) {
remainder = H % 360;
if (remainder !== 0) {
H = remainder + 360;
}
}
res.H = H;
res.S = S;
return res;
}
function rgbToHslOptimizedIfElse(rgb) {
var R = rgb.R / 255;
var G = rgb.G / 255;
var B = rgb.B / 255;
var Cmax = Math.max(Math.max(R, G), B);
var Cmin = Math.min(Math.min(R, G), B);
var delta = Cmax - Cmin;
var S = 0;
var H = 0;
var L = (Cmax + Cmin) / 2;
var res = {
H: 0,
S: 0,
L: L
}
var remainder = 0;
if (delta !== 0) {
S = delta / (1 - Math.abs((2 * L) - 1));
if (Cmax === R) {
H = ((G - B) / delta) % 6;
} else if (Cmax === G) {
H = ((B - R) / delta) + 2;
} else if (Cmax === B) {
H = ((R - G) / delta) + 4;
}
H *= 60;
}
if (H < 0) {
remainder = H % 360;
if (remainder !== 0) {
H = remainder + 360;
}
}
res.H = H;
res.S = S;
return res;
}
function rgbToHslOptimizedIfElseConstant(rgb) {
var R = rgb.R * 0.00392156862745;
var G = rgb.G * 0.00392156862745;
var B = rgb.B * 0.00392156862745;
var Cmax = Math.max(Math.max(R, G), B);
var Cmin = Math.min(Math.min(R, G), B);
var delta = Cmax - Cmin;
var S = 0;
var H = 0;
var L = (Cmax + Cmin) * 0.5;
var res = {
H: 0,
S: 0,
L: L
}
var remainder = 0;
if (delta !== 0) {
S = delta / (1 - Math.abs((2 * L) - 1));
if (Cmax === R) {
H = ((G - B) / delta) % 6;
} else if (Cmax === G) {
H = ((B - R) / delta) + 2;
} else if (Cmax === B) {
H = ((R - G) / delta) + 4;
}
H *= 60;
}
if (H < 0) {
remainder = H % 360;
if (remainder !== 0) {
H = remainder + 360;
}
}
res.H = H;
res.S = S;
return res;
}
function rgbToHslOptimizedIfElseConstantClosure(c) {
var a = .00392156862745 * c.h, e = .00392156862745 * c.f, f = .00392156862745 * c.c, g = Math.max(Math.max(a, e), f), d = Math.min(Math.min(a, e), f), h = g - d, b = c = 0, k = (g + d) / 2, d = {
a: 0,
b: 0,
g: k
};
0 !== h && (c = h / (1 - Math.abs(2 * k - 1)), g === a ? b = (e - f) / h % 6 : g === e ? b = (f - a) / h + 2 : g === f && (b = (a - e) / h + 4), b *= 60);
0 > b && (a = b % 360, 0 !== a && (b = a + 360));
d.a = b;
d.b = c;
return d;
};
function rgbToHslOptimizedClosure(c) {
var a = c.f / 255, e = c.b / 255, f = c.a / 255, k = Math.max(Math.max(a, e), f), d = Math.min(Math.min(a, e), f), g = k - d, b = c = 0, l = (k + d) / 2, d = {
c: 0,
g: 0,
h: l
};
if (0 !== g) {
c = g / (1 - Math.abs(2 * l - 1));
switch (k) {
case a:
b = (e - f) / g % 6;
break;
case e:
b = (f - a) / g + 2;
break;
case f:
b = (a - e) / g + 4;
}
b *= 60;
}
0 > b && (a = b % 360, 0 !== a && (b = a + 360));
d.c = b;
d.g = c;
return d;
}
function rgbToHslOptimizedClosureIfElse(c) {
var a = c.f / 255, e = c.b / 255, f = c.a / 255, g = Math.max(Math.max(a, e), f), d = Math.min(Math.min(a, e), f), h = g - d, b = c = 0, l = (g + d) / 2, d = {
c: 0,
g: 0,
h: l
};
0 !== h && (c = h / (1 - Math.abs(2 * l - 1)), g === a ? b = (e - f) / h % 6 : g === e ? b = (f - a) / h + 2 : g === f && (b = (a - e) / h + 4), b *= 60);
0 > b && (a = b % 360, 0 !== a && (b = a + 360));
d.c = b;
d.g = c;
return d;
}
new Benchmark.Suite()
.add('rgbToHsl', function () {
rgbToHsl(RGB);
})
.add('rgbToHsl_', function () {
rgbToHsl_(RGB.R, RGB.G, RGB.B);
})
.add('rgbToHslIfElse', function () {
rgbToHslIfElse(RGB);
})
.add('rgbToHslOptimized', function () {
rgbToHslOptimized(RGB);
})
.add('rgbToHslOptimizedClosure', function () {
rgbToHslOptimizedClosure(RGB);
})
.add('rgbToHslOptimizedIfElse', function () {
rgbToHslOptimizedIfElse(RGB);
})
.add('rgbToHslOptimizedClosureIfElse', function () {
rgbToHslOptimizedClosureIfElse(RGB);
})
.add('rgbToHslOptimizedIfElseConstant', function () {
rgbToHslOptimizedIfElseConstant(RGB);
})
.add('rgbToHslOptimizedIfElseConstantClosure', function () {
rgbToHslOptimizedIfElseConstantClosure(RGB);
})
.on('cycle', function (event) {
console.log(String(event.target));
})
.on('complete', function () {
console.log('Fastest is ' + this.filter('fastest').map('name'));
console.log('Slowest is ' + this.filter('slowest').map('name'));
})
.run({ 'async': false });
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"></script>
<script src="https://cdn.rawgit.com/bestiejs/benchmark.js/master/benchmark.js"></script>
while
循环,改为if (H < 0) H = -(H % 360)
。如果我没记错的话,这将给你相同的结果。 - Mike Cluck