switch 做判断
function getStar () {switch (true) {case grade == 100:console.log(‘5星‘);break;case grade >= 80:console.log(‘4星‘);break;case grade >= 60:console.log(‘3星‘);break;case grade >= 50:console.log(‘2星‘);break;default:console.log(‘1星‘);break;}}getStar(40) ????// ?‘1星‘JS9 -- switch
原文地址：https://www.cnblogs.com/lgyong/p/10374324.html