switch (weekDay) { case 1: console.log('今天是星期一'); break; case 2: console.log('今天是星期二'); break; case 3: console.log('今天是星期三'); break; case 4: console.log('今天是星期四'); break; case 5: console.log('今天是星期五'); break; case 6: console.log('今天是星期六'); break; case 7: console.log('今天是星期日'); break; default: console.log('没有匹配'); break; }