方法：

因为引入的是本地资源，要把资源写在“require”方法里

  sources: [
          {
            //类型
            type: 'video/mp4', 
            src:
              // 'https://vdept.bdstatic.com/456b54495743493962554345724c6657/75666c454a4d3637/6bcdb2c5d34e42a7e415eb94fd256c0776f262dd6b4a0ae236ec49141d30aee0d7d2168a1c3578a306b0aa646ced25250a8b77a59e758bf998ca67e20a951294.mp4?auth_key=1588762628-0-0-f0a1425379b81c7627fd77316fe1af10'
              require('../../assets/video/xing.mp4')
          },
             ]