there are two controls in the form, which use rules and prop to verify the validity: 
 el-select 
 el-input 
 el-select will change the range of legal values in el-input. When a legal number has been entered in el-input and the user modifies the option in el-select, how to trigger el-input to re-detect legitimacy and prompt illegal input? 
    sysdiskSize: [
      { required: true, message: "", trigger: "blur", type: "number" },
      { validator: validateSysDiskSize, trigger: "blur" }
    ],