为什么我的这个 el-select 没有触发校验? [Demo](https://link.segmentfault.com/?enc=1TvviNj9x%2BYare1G%2BozdFQ%3D%3D.IwaCdQY6IpekAO2%2Bl%2BgmHB1mTnl7bAR14KkS1NBZYAlOsff0Bu4kSqPY7fObkwybaiPUcNK9F1ItRSfYydxhsXl19DJKI0wlzaygY%2BPhB40u7yHfjECI97ZId%2BtWWP%2FUpCHr2smz2%2BCWYgql%2F%2BTBQlCvvjL6KXt%2BJv6JMAXqG%2FwB44ESOTZBsyFfK5pU6pgoQPyzhYXEPAiewGH72qAZuviHWk1ewouz0K0vnxTrIeLgMp5TbzHOHA3NY0gE2hq5Ok3I0ZxJ0oMHUX4Zaor0VJzyrv0PHkOWC8IsNmMkvj19M8zUub9mgVM7R0HBNH9CRo3Y5rOmMJb%2FlJ7SJQbHzwyGvUiXmyy%2BzZ9nbsdhdOzEl3dDUbLHyHhvsDi57yIdXiB49Qyndv3JmF%2BqkwzhP835yuPPIt0D6v1vYar86vakpb%2Bqv5sOpJxoWDGd%2FULR0qHiy8PaNuxZ%2B1pLhDKpuke%2B10EFdqhtfW%2Fvcj4Yv5%2FfH29khPZJ%2FY05IHTzpGxn9Ja3vbNtVQtDA0c0x2G1IboOKLtZOHPWkQN2vQO8bh93rMH56yqtmFBzlbXVVFK92Pz%2BxpZiA5c3mKq7hjTWg4NMG50rLMSB%2BRjc6EK9WTEIZHOElKxS%2Bsa73o9%2FSrPklP5UiWWfVjilRRN4kFDTD1zjIx8Ye9TjIpfMNyLpflRFkSWLp5kagnUF2sjCTnaQQsQsN6tVlP4sX74%2F6NLl0M9M08d1jL7NSCYfOXGMAfVXN3Jd7SSZN4wYrRRMt%2BLKe6UlEPAAgqNmOYdNoKpqcNwh8ZNvYV02w5zthOM3%2BEgsNVv4jm6YpLrHqAgnkGKXJa5Vk1m6n4upVcN%2BuL4o1G8pKfNwFIoNW8TzqFniRDvMZBVi643eTKVJcDVAsU04oKQ%2FbeyXnypePU9zQ1CRsLJmE%2Fw9CinZEWbk2Ch17SC8FRx2%2BVnHrj8oV7BLt7vfTqNQ3CXMSR8tS59DuISAT0wP8U%2FJCoMTBZoFX7K0Sy5Xa9cAVi4GLlXrKY8FHmTHR4MHxPvIkkCVTciGHStdi2hvTJvkXXXeSCwayrkggU3rePrSLhEhw3pJU%2FuOX0YlkMNfWNm79KWHp9ktTjmpDK3zzzYCkKtMSE3pq%2BWHizqUg%2BYIrd3WCqCaBxsphT%2FP0zYt93CZSuiICgzOqCzWgg2BNG2DB47PBlg7DADV2KYy0v1sukWxdxdkhqqbXNOJo1h0MZln2LbUEJbivqdfqRpjVAsE50opNvYUsm6fOFUlhKf9V9hV0UKjEaPhpgcZvA%2F3mhMVqAJ13i1M4MEAipBRXSuHIuMiONE3NAsdNxf5FnFy5KZ4xrcFpNzs6K8e4szjN00cjfUdz5HHcmsp%2FDkNmNzEBhvEddTV4FycFLrHPuVXI4it%2BgA%2Brbw%2BwJhafGOVFUO4WpLUnKM20Q%2BcjIuXVMVLPh6KroPbPA5FcyNTW%2B%2FvLsHYmAMWGh1egqPD7%2B7JJoJmHsTndqaqAC3Q%2BOQwlg5qpESssHBgN08iE2rshbUhMNk8ueE%2FZM%2BC7jnz11dYaPrPSGJnxVRtoCKOVrjkRy7kjDhOSIQXQ8x8Wnq87NHP9whTLZAvbFsjtnAY904Md9D5jT3YioSSMuJnrI0JFR4pHYR1dIap1ItV6w3EOO3EfcvX067z8sho3PXOuOzuwrkh5m1Jizy%2FAsOaAdoIhtWaeffvZFhH9TAOac%2BeF8EhNO6X3jdqUwu82PeIn2%2Fa3W9RIU93xunMdbSItj1YG4QddurWAivFNXVIJu3IZWHYtbyLhlR%2FoBu1Zc2OHdYjaKdughyAsSIm%2BX6Ke6aURJcxWLqxnUbWfDrNLaNjUtl9Nq01rv09A0j58aAxFSnFP6PQKrrkzUT2R95IEVL8adUc5DM28XbUrbwFFblcSdRRYrzPEV%2BDtlDpzz7rLCbZfv5A0BnlfCAtlEPyCdkCC9Ld1NT6YuI%2F%2Br4ZxcaGuqoHb%2B8aHOKixC9Nj9eHaRsVHztkMXIUu1pb6GfZNc%2FmLY0SbOOXAelCIInVyF%2B6yjrXCOrx%2BpG%2FSkLgoA5q%2BYz54Xsz8ZTSWr4ZTSzSw2xIhUa0YCheC%2BJD1m5VNK2f1uw%2BDZkSIQrMaqiDafqEqrcy2Gc1QKfLiEmYQZIKOrKEYlI31U5MVEkaA92MQFiv4NXqiDExesyubow8gCrndKmjzWVDomYhFyrNK%2BRFppxvj8wF1VMxpWe5SfrCaF2%2FOGh2Nkx86svEleOesdTmqB1Zghm68zpE%2F4RhlPU9hGxn3Y%2BZosUuySVkMNrL4kej6g5e1MuD1cjJd%2FJCw%2FCswUOFA8FSrzlLXGynDhjDgG6qLsJeAhlWXkF6tRY1uCo8gMXTzb2Qq8B%2Bk8khIRe1hPZ63WTjHHzjcMkb6BIQDcoRcjUQA67V21SXvdNXR3DzxVOgxRGBhAxBxvbDhhzd108Sl9E3CEr0ATdUEtu%2BmufY1VshSpHcYmwsctFdHs%2Fd3jNxusBPBQeRC%2FqOxL08vBPntqYvRHbnx6VTx1LWSGHcDPuOe0bkaij23go01gSiCrJ6VR3IpEroGkzgyHs3ZrkZoYdywU23MsrvY6LT06fJPE%2FYRjJNgrlwpVUGMMdqRIefxQaf5AIgHRG%2Fulj957DMvULwEcAZzS1ZLgsrzEIItH7HvyIsC2WSxre%2FpktYbBnumEkwIROVEh25L8hVhXTqKoJQ0OovXQs2OsQrTHS51BjeozlD6n%2F%2BRLobFzXI9t1rU%2FcpwQ%2FsnJpQEmnVsVYCg8nue4o477xdg7Dp1GvGWC0bL0f5c3bnW%2BkJtbxkFelsnQKLdBRD6LuF5wbsbTOM0Agp%2FeZz6js%2BK2oKtjTDT3JktXEThMrXRSNtGuDI9gP0mseukDL8lTNGjhhIcNUwtomNzLnNmr0n%2BAPWTKwjA8O8nA2WYM9Ck1c4mBGIIBzbm7ygODzso%2FPAMBAwlkUfN2E%2FmyybDzfinhMs6vCtHaEDDkSzdcTTqZUkIv33QxcHgLJqVmOamkMDSr9X%2BnsoEINEM9OO0YuENZ0Bqwo%2FCNz38RGMZ9syWoLStjPjm7AV1ZCEFH29mcCDBlZA3CiUUfxkhveFeQqL%2Fyayl5Ja1m1XJVp5XTFlYio0GMPp59kPjCk1mkL1GxCEMHedLOsNEeCfw58LVXtZ5rPoxqTnLk%2FmrIl3Qg8Izs1lJ08ek9sCDCjptzmN79x8IVYzSru2asNeFUEVMzb9oZIVJL1AHL5Bne3zAt%2BAAvdcZBJ0mfThWrYi1iDf%2FQRdfsp9VLAdFt6ceyhSu%2B336garWyidPONxDLUyuSQ%2BRmkn%2Faukw8kqGtQwTwtHvCxvW2OZyA%2BGbXdNLwfOV7NzAc72d6yz0MqnNXLxRPXTX7Q7gdmNltdVTwL28XafHJBRDn8S6TrTb4bT%2FIlrB5O5NzD9RWeVp3QBebcU7Edv90q36z5PWOOGX92trgTPQVTnfG3IeCeLyEbFxb1tJ5KiqZ8xszRiCkdeDTbfq2msinK3M%2F7dTNd%2FPYGDTZ1X8gSzSJgs6NjYh4p9b75XeqsoAmOC%2B2xSJ2dZ3R4bdyFN8URKXunmiY2SQrNNOr4nq5%2BLvmW2P0j7q3zWjIPNp%2BF4bDyiIH%2B8iSqO84E8lxc0hGsN7sOL5gCx4Oqyf8yFGj5fWSZLwVchxQqV0clGAjdH0KVyU2cSwaJp%2BW8YscwYcrQ4ROHqYbYlQAys4Mw28lx1wARh6QDWZyuLT%2BgX7fOlERw%2BED3JXres%2FFSh08UclgiOFycz3O9npomwbFvAkHMgBcDMWryr62CDtAZ9qYwlYJyJ%2Fkg7YuErfEu4erR8H0PU3v4cWhorNa0V%2Bo0ufUBJp4Aikmp7xVPlMV8Ikd5ollcn2p4JV5pni8zMc8hPkp3eWXGyhKWdaVPpRKaUDrr%2BEu7l3vm8LiOzKdejzBzrtgNvG9Wmq6Xg2YQBFwWEM1B0iHMeUSuzuodJDvMGUA6eb7cwylC5irhr23E9rhA5kpNxIdv9%2BKBMiINp0rbZ%2FxUfY7Wk0ok4gGsXlftwgYihXg0UXYeKz7B99CEwJSoBEroKX1KxsGn08Z1xZGrjFY1lO0IW989lwmPoMhTzT7wiCWSw%2BhrT2GxjTMCgB1x%2FerBGMIJ%2BQn3iu0C2RhhxSCvYOb7ak%2Bip0fN5ppM9m7%2F4pzhcM%2B2z6MqyB%2BcV06bpRdNvXTeUNvlR1iL2gzuE46cOJdTRVg8JKk8VRmgizUYiMdGExGh9u8OBzJT1ODjn%2BodNLkVg4TENLzz3UGfQjUhaBYxNPxaNLttKFFyvVZ4D2wJ%2FPiIFuGpbuffo2leur4K8ebN3rz63l789Mj5GM2rU3UYGSenT48I3tTVncw1H8bN74e24VRvNEjkARstRhNC%2F4KkpK1n3yf59qbkGm18pHg4O2OdbaCXHqagnyBoxfhGs2t45QQmtrQVN8aEr36%2FiRTGzVx6S5fyUdUdLRr3e%2FFChNGMn2rfJmrW2onEvtoWwyW7mAefMtJWZF1EpPd8RN6LSSRwrGiMR4oNeMhlJqdZrsJcOu0ayQ%2FVL8WQUJ8opFtDUV9Osb8VhRMtKJkdd3Bh7ZqMdVJAnVhd9O5x8bsZ8WDc%2BC0sDflqAFXmBTcRdaVo47EaM60CRTFVTH14L%2B7GNA5xu1jSznzv1fHaVhXIX99A49q3pTcKXcLiaXioC3%2FU6KLbYCxorIniEVkCQCG9ed%2Fflmvs75prX516VZFX8UEtq3wC6UxdY%2FUxAfzjfkUt2Cks3ox4sCvSbTgqcA%2BZ9IOO9RLVlbgGETWkhXa%2FhGF33APnC2tuGL9uC9E6jL7u4MhxABa6DYq6AxaBt5d3yKrWRlusv%2F3FMQnmx6UlN0ZRHDF4gVoYXHiD7C33LSsDNGKqQpu37OMwpm6%2BE2S2mTXQynLM1m9D%2BBimf9szqe2GrBYuQSNlHwMhgrbza48aaRPuVkh2y0sHf5cEtRZn%2B55NFgRnOT5GuU7I47bulyvXqGulHZdF20MfanL5vtG2Dl3vxfpg50OH6jqKr05%2FbJ3BVpB8qf2FVdMJS4CyEf2AYLDhnP%2BL0z5iIn0wFPrGbm25O2dxqdL8%2F4F0BbGkuNm7AUE475c2P0gy%2FA8rI%2Fa1HGgAs05a%2BkUekgSc7XO53m8R4mRepqFeNJlqhrJkD2wipmpr9qvup0M5pTBRchMZ8r4XHUT7762eICcDr8E4x5zi15B71NI6J9h6Jld1ycr2jJSHOn%2BLT9pL2dvTzkmW1Q2Ln8uVjbNVoRu3wGMyhCZFw%2BFIgKQY5J5z2Lp77sbAc1F5ljNtIw3aMqTqNpEAMn7KGhEH%2B%2BoXY6qAlIhqc58wjjFmCHBeAGO403%2FZuIIFqudt32cSg4sk689NKnanynErqH9nTyZMXV9ueil6vHV%2FuNQcdTYWRC7a0ERyx5X3afVPda4tMEQ%2FauH3Pl6TyltIW8X8eH1NjPmjzM7Jh4h36odCrh5oCnSAvvI4Q5g8zlnXpbnaTpOz3F60b4d4KIscMnN4O1SOatP6psS6W53jLl12HmDl0OZKhuzz7EtPY3G9rc9aLOBtPzPMsLx9sxc3j8TGGOG0Vpmfh1lJVHkgfo%2BOAdbYW%2F1VelmGwL3ruMadrhQNzSPdtMxiDSoQ64jxA%2B49xvfO1nicFttHgq9c%2BglajAuwQOS79EZp6C9nS77hmiD79wwOHwP3Avxs9BqUaNmX4sXpMT010DF%2BU77t%2Fql3sl01lCOK6BqND3LPDV4fYdOaEJ%2FohukKGGCPIrPvl7ae%2BcvEkttUaquYjLOlXygsY%2BtrwCaxltJw%2BzqVUrf2fB8RZS%2BjvJ0pRI8IjrsO7VQRHasR8bZJ6dj0s%2BgE8VSj%2BmyyeWQnuNiy3CVNvVf0YNc3uz%2FlnvrgZhOzYKKLbvLJmNIksgSyfj8kADVXH8p8DO9HU1LS1cPRdaOow%2FsLpWSpDH4X2vRtgKFziFHuM0IbeL1Ho1XHR7d5tFYmqtOEoStcxvRRtA%2BPOh1zybvcyQ1jDgjI7ytvTfoeqT8Sbbsd0VDLguxT7reWe%2Bg6rWSlqH3G82tP69m5hDxTfc7v6fCc8XCfh97OGpeeUUZgqHJmhC6KjC6NC88GU6EVfT9csoIgOiLVsyvux4V7GbK7ms3NfzFMbQx3vDNbGpN167ItcjQe1%2FysF%2FCc2Z2Aytb%2FcTW7ZaIfq59d6q7JTGgKlMK5pLD8xmmHe%2BYnAuY8TISABy4a6QYAkf3RXE4akhQQN%2FffhoEUq%2F7Eu1p99zHdyJgqjoAdBKbfSIn%2BhU9vS6p9nfh7%2FHXrZtm2nLnhwSDQiGntKePtgw%2F%2BTbZWYTCnuNzFQLX8wpz5vZJUFGLRL0aY%2FQGp5YJvXfBVK1HfIEMfuF%2FOhTNyQnc5FULP2kH68peTQCdOzPH%2FkeuMpnl%2Fsp97axFWP9TqxTHJp0pY4mLXzrfNUVYOPPZ4oV0ix7bKSIq94S4StFCAUQmDGGldqvvK%2FBZ9NN5%2F0m6SfLawRzYhhWkw7bNKlanwTZdAeyx72quhyN%2B4O1FzmibGd1ktbMbVt1Lfw8IZWRBncw%2BWX1msMwDWgfsaC5kbllWEZ95Gih%2B3SIUHlKL5C1Qhldxiu9vFq17Of%2FVCWHH6ZXWGAHX4Cv4W%2FqqUo3la%2Bgi4yIFBoOutTDU%2B%2F4q5T%2BojvQpQCsD6Jiebc5tGp1l9neXAWniQCXg5IzRb82qecXDSmAwVsE1yCarwfM2ku%2B9MZC6W%2FCxKv8soEV0ful%2F1w4ozma0sni2Mj7Eh6xfD3EY2I7VBxwcHGrBHWrFJlWujrmXmM7sEh9y57bcwsinwLgt%2FSdra3FAa4p0%2BN99FaWEvoz%2Bp8AFHGjxR3XLozme87l1E%2BDSXMeTsSJyU0G5rbYG5AgT9h7LNOlYVjmQ%3D%3D) b