js优化嵌套的条件语句

if (color) {
if (color === 'black') {
printBlackBackground();
} else if (color === 'red') {
printRedBackground();
} else if (color === 'blue') {
printBlueBackground();
} else if (color === 'green') {
printGreenBackground();
} else {
printYellowBackground();
}

}

一种方法来提高嵌套的
if
语句是用[code]switch

switch(color) {case 'black':printBlackBackground();break;case 'red':printRedBackground();break;case 'blue':printBlueBackground();break;case 'green':printGreenBackground();break;default:printYellowBackground();}

但是我们应该时刻注意避免太多判断在一个条件里，尽量少的使用[code]switch

object

var colorObj = {'black': printBlackBackground,'red': printRedBackground,'blue': printBlueBackground,'green': printGreenBackground,'yellow': printYellowBackground};if (color in colorObj) {colorObj[color]();}