对Element表单进行特殊校验

rules: {
          ‘httpPath‘: [
            { 
              required: true, 
              message: ‘该字段必填‘
            },
            {
              max: 255,
              message: "长度不得超过255个字符"
            },
            {
              validator: (rule, value, callback) => {
               // 在此处进行处理
                callback()
              },
              trigger: ‘blur‘
            }
          ],
          
        }