throw error 和 throw new Error() 的区别

      const num = 5
      try {
        if (num === 5) {
          throw new Error('num不能为5')
        }
      } catch (e) {
        console.log(e) // 打印出Error对象：Error: num不能为5
        console.log(e.message) // 打印：num不能为5
      }

 

      const num = 5
      try {
        if (num === 5) {
          // throw new Error('num不能为5')
          throw 'num不能为5'
        }
      } catch (e) {
        console.log(e) // 打印：num不能为5
        console.log(e.message) // undefined
      }