类名 CheckUtil

# new CheckUtil()

类型验证工具

方法

方法概述

名称 返回值类型 描述
isArguments boolean

Checks if value is likely an arguments object.
isArray boolean

Checks if value is Array.
isArrayLike boolean

Checks if value is array-like. A value is considered array-like if it's not a function and has a value.length that's an integer greater than or equal to 0 and less than or equal to Number.MAX_SAFE_INTEGER.
isArrayLikeObject boolean

This method is like isArrayLike except that it also checks if value is an object.
isBase64 boolean

Check if value is a base64
isBoolean boolean

Checks if value is classified as a boolean primitive or object.
isElement boolean

Checks if value is likely a DOM element.
isError boolean

Checks if value is an Error, EvalError, RangeError, ReferenceError, SyntaxError, TypeError, or URIError object.
isFunction boolean

Checks if value is classified as a Function object.
isLength boolean

Checks if value is a valid array-like length.

Note: This method is loosely based on ToLength.
isNative boolean

Checks if value is a pristine native function.
isNil boolean

Checks if value is null or undefined.
isNull boolean

Checks if value is null.
isNumber boolean

Checks if value is classified as a Number primitive or object.

Note: To exclude Infinity, -Infinity, and NaN, which are classified as numbers, use the Number.isFinite method.
isObject boolean

Checks if value is the language type of Object. (e.g. arrays, functions, objects, regexes, new Number(0), and new String(''))
isObjectLike boolean

Checks if value is object-like. A value is object-like if it's not null and has a typeof result of "object".
isPlainObject boolean

Checks if value is a plain object, that is, an object created by the Object constructor or one with a [[Prototype]] of null.
isString boolean

Checks if value is classified as a String primitive or object.
isSymbol boolean

Checks if value is classified as a Symbol primitive or object.
isUndefined boolean

Checks if value is undefined.

方法详情

# static isArguments(value)

Checks if value is likely an arguments object.

参数

名称 类型 描述
value *

The value to check.
Since:
  • 0.1.0

Returns true if value is an arguments object, else false.

boolean
示例
isArguments(function() { return arguments }())
// => true

isArguments([1, 2, 3])
// => false

# static isArray(value)

Checks if value is Array.

参数

名称 类型 描述
value *

The value to check.
Since:
  • 0.1.0

Returns true if value is Array, else false.

boolean
示例
isArray([1,2,3])
// => true

# static isArrayLike(value)

Checks if value is array-like. A value is considered array-like if it's not a function and has a value.length that's an integer greater than or equal to 0 and less than or equal to Number.MAX_SAFE_INTEGER.

参数

名称 类型 描述
value *

The value to check.
Since:
  • 4.0.0

Returns true if value is array-like, else false.

boolean
示例
isArrayLike([1, 2, 3])
// => true

isArrayLike(document.body.children)
// => true

isArrayLike('abc')
// => true

isArrayLike(Function)
// => false

# static isArrayLikeObject(value)

This method is like isArrayLike except that it also checks if value is an object.

参数

名称 类型 描述
value *

The value to check.
Since:
  • 4.0.0

Returns true if value is an array-like object, else false.

boolean
示例
isArrayLikeObject([1, 2, 3])
// => true

isArrayLikeObject(document.body.children)
// => true

isArrayLikeObject('abc')
// => false

isArrayLikeObject(Function)
// => false

# static isBase64(value)

Check if value is a base64

参数

名称 类型 描述
value *

Returns true if value is a base64

boolean

# static isBoolean(value)

Checks if value is classified as a boolean primitive or object.

参数

名称 类型 描述
value *

The value to check.

Returns true if value is a boolean, else false.

boolean
示例
isBoolean(false)
// => true

isBoolean(null)
// => false

# static isElement(value)

Checks if value is likely a DOM element.

参数

名称 类型 描述
value *

The value to check.
Since:
  • 0.1.0

Returns true if value is a DOM element, else false.

boolean
示例
isElement(document.body)
// => true

isElement('<body>')
// => false

# static isError(value)

Checks if value is an Error, EvalError, RangeError, ReferenceError, SyntaxError, TypeError, or URIError object.

参数

名称 类型 描述
value *

The value to check.
Since:
  • 3.0.0

Returns true if value is an error object, else false.

boolean
示例
isError(new Error)
// => true

isError(Error)
// => false

# static isFunction(value)

Checks if value is classified as a Function object.

参数

名称 类型 描述
value *

The value to check.
Since:
  • 0.1.0

Returns true if value is a function, else false.

boolean
示例
isFunction(class Any{})
// => true

isFunction(() => {})
// => true

isFunction(async () => {})
// => true

isFunction(function * Any() {})
// => true

isFunction(Math.round)
// => true

isFunction(/abc/)
// => false

# static isLength(value)

Checks if value is a valid array-like length.

Note: This method is loosely based on ToLength.

参数

名称 类型 描述
value *

The value to check.
Since:
  • 4.0.0

Returns true if value is a valid length, else false.

boolean
示例
isLength(3)
// => true

isLength(Number.MIN_VALUE)
// => false

isLength(Infinity)
// => false

isLength('3')
// => false

# static isNative(value)

Checks if value is a pristine native function.

参数

名称 类型 描述
value *

The value to check.
Since:
  • 3.0.0

Returns true if value is a native function, else false.

boolean
示例
isNative(Array.prototype.push)
// => true

isNative(isDate)
// => false

# static isNil(value)

Checks if value is null or undefined.

参数

名称 类型 描述
value *

The value to check.
Since:
  • 4.0.0

Returns true if value is nullish, else false.

boolean
示例
isNil(null)
// => true

isNil(void 0)
// => true

isNil(NaN)
// => false

# static isNull(value)

Checks if value is null.

参数

名称 类型 描述
value *

The value to check.
Since:
  • 0.1.0

Returns true if value is null, else false.

boolean
示例
isNull(null)
// => true

isNull(void 0)
// => false

# static isNumber(value)

Checks if value is classified as a Number primitive or object.

Note: To exclude Infinity, -Infinity, and NaN, which are classified as numbers, use the Number.isFinite method.

参数

名称 类型 描述
value *

The value to check.
Since:
  • 0.1.0
See:
  • isInteger, toInteger, toNumber

Returns true if value is a number, else false.

boolean
示例
isNumber(3)
// => true

isNumber(Number.MIN_VALUE)
// => true

isNumber(Infinity)
// => true

isNumber('3')
// => false

# static isObject(value)

Checks if value is the language type of Object. (e.g. arrays, functions, objects, regexes, new Number(0), and new String(''))

参数

名称 类型 描述
value *

The value to check.
Since:
  • 0.1.0

Returns true if value is an object, else false.

boolean
示例
isObject({})
// => true

isObject([1, 2, 3])
// => true

isObject(Function)
// => true

isObject(null)
// => false

# static isObjectLike(value)

Checks if value is object-like. A value is object-like if it's not null and has a typeof result of "object".

参数

名称 类型 描述
value *

The value to check.

Returns true if value is object-like, else false.

boolean
示例
isObjectLike({})
// => true

isObjectLike([1, 2, 3])
// => true

isObjectLike(Function)
// => false

isObjectLike(null)
// => false

# static isPlainObject(value)

Checks if value is a plain object, that is, an object created by the Object constructor or one with a [[Prototype]] of null.

参数

名称 类型 描述
value *

The value to check.
Since:
  • 0.8.0

Returns true if value is a plain object, else false.

boolean
示例
function Foo() {
  this.a = 1
}

isPlainObject(new Foo)
// => false

isPlainObject([1, 2, 3])
// => false

isPlainObject({ 'x': 0, 'y': 0 })
// => true

isPlainObject(Object.create(null))
// => true

# static isString(value)

Checks if value is classified as a String primitive or object.

参数

名称 类型 描述
value *

The value to check.
Since:
  • 0.1.0

Returns true if value is a string, else false.

boolean
示例
isString('abc')
// => true

isString(1)
// => false

# static isSymbol(value)

Checks if value is classified as a Symbol primitive or object.

参数

名称 类型 描述
value *

The value to check.
Since:
  • 4.0.0

Returns true if value is a symbol, else false.

boolean
示例
isSymbol(Symbol.iterator)
// => true

isSymbol('abc')
// => false

# static isUndefined(value)

Checks if value is undefined.

参数

名称 类型 描述
value *

The value to check.
Since:
  • 0.1.0

Returns true if value is undefined, else false.

boolean
示例
isUndefined(void 0)
// => true

isUndefined(null)
// => false