你可以简单地把它们分开，这样就给予了比率...

if((12/3) > (12/2)) {
    console.log(true);
} else {
    console.log(false); 
}

您可以简单地将它们彼此分开，如用户 caramba 所述：

const ratioA = 12/3; // 12:3
const ratioB = 12/2; // 12:2
const sameRatio = ratioA === ratioB // is ratioA the same as ratioB?

...但有时您可能希望比较接近但不完全存在的值。

const aspectRatios = [16/9, 4/3, 1/1] // 16:9, 4:3, 1:1

为此，您应该执行以下操作：

// The number here respresents accuracy. Low-accuracy is good. 
// The lower the accuracy, the higher chance we have of getting a close match.
const makeComparisonFloat = (float) => Math.round(float * 10) 
const ratio = makeComparisonFloat(width / height)
return aspectRatios.find((option) => makeComparisonFloat(option.ratio) === ratio)