/**
* @Description: js变量类型判断
* @Author: MuYi086
* @Email: 1258947325@qq.com
* @Blog: https://github.com/MuYi086/blog
* @Date: 2021/04/11 12:30
*/
class VarType {
private typeList: string[]
private static _instance: VarType | null = null
constructor() {
this.typeList = ['Null', 'Undefined', 'Object', 'Array', 'ArrayBuffer', 'String', 'Number', 'Boolean', 'Function', 'RegExp', 'Date', 'FormData', 'File', 'Blob', 'URLSearchParams', 'Set', 'WeakSet', 'Map', 'WeakMap']
this.init()
}
static get instance(): VarType {
if (!VarType._instance) {
VarType._instance = new VarType()
}
return VarType._instance
}
/**
* 判断变量类型
* @param {string} value
* @returns lowercase string
*/
private type (value: any): string {
const s = Object.prototype.toString.call(value)
return s.match(/\[object (.*?)\]/)[1].toLowerCase()
}
/**
* 增加判断类型数据方法
*/
private init(): void {
const self = this
this.typeList.forEach((t: string) => {
Object.defineProperty(VarType.prototype, `is${t}`, {
value: function (o: any) {
return self.type(o) === t.toLowerCase()
},
writable: true,
configurable: true
})
})
}
/**
* isBuffer
* @param {any} val
* @returns boolean
*/
static isBuffer(val: any): boolean {
return val !== null && (VarType as any).isUndefined(val) && val.constructor !== null && (VarType as any).isUndefined(val.constructor) && typeof val.constructor.isBuffer === 'function' && val.constructor.isBuffer(val)
}
/**
* isStream
* @param {any} val
* @returns boolean
*/
static isStream(val: any): boolean {
return (VarType as any).isObject(val) && (VarType as any).isFunction(val.pipe)
}
/**
* proxy对象有俩个特性: reactive, readonly
* @param {*} val
* @returns boolean
*/
// isProxy (val) {
// function shouldBeCloneable (o) {
// const type = typeof o
// return (
// o?.constructor === ({}).constructor ||
// type === 'undefined' ||
// o === null ||
// type === 'boolean' ||
// type === 'number' ||
// type === 'string' ||
// o instanceof Date ||
// o instanceof RegExp ||
// o instanceof Blob ||
// o instanceof File ||
// o instanceof FileList ||
// o instanceof ArrayBuffer ||
// o instanceof ImageData ||
// o instanceof ImageBitmap ||
// o instanceof Array ||
// o instanceof Map ||
// o instanceof Set
// )
// }
// function isCloneable (val) {
// try {
// postMessage(val, '*')
// } catch (error) {
// // 错误码25表示不能被clone
// if (error?.code === 25) return false
// }
// return true
// }
// const _shouldBeCloneable = shouldBeCloneable(val)
// const _isCloneable = isCloneable(val)
// return _shouldBeCloneable && !_isCloneable
// }
}
// 使用 varType["isNull"](null)等
export const varType = VarType.instance
