ajv.addKeyword 自定义关键字

https://ajv.js.org/guide/user-keywords.html
ajv关键字，例如

• type
• properties
• minLength

关键字特点：验证数据是否符合某些规则

ajv.addKeyword({
  keyword: "range",
  type: "number",
  schemaType: "array",
  implements: "exclusiveRange",
  compile: ([min, max], parentSchema) =>
    parentSchema.exclusiveRange === true
      ? (data) => data > min && data < max
      : (data) => data >= min && data <= max,
})
const schema = {range: [2, 4], exclusiveRange: true}
const validate = ajv.compile(schema)
console.log(validate(2.01)) // true
console.log(validate(3.99)) // true
console.log(validate(2)) // false
console.log(validate(4)) // false

Meta-schemas

https://ajv.js.org/options.html#meta
http://json-schema.org/specification.html