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API文档
类名 CheckUtil

# new CheckUtil()

类型验证工具

查看源代码 common/util/CheckUtil.js, line 19

方法

# 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

查看源代码 common/util/CheckUtil.js, line 505

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

查看源代码 common/util/CheckUtil.js, line 277

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

查看源代码 common/util/CheckUtil.js, line 304

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

查看源代码 common/util/CheckUtil.js, line 335

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 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.

查看源代码 common/util/CheckUtil.js, line 52

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

查看源代码 common/util/CheckUtil.js, line 452

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

查看源代码 common/util/CheckUtil.js, line 476

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

查看源代码 common/util/CheckUtil.js, line 139

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

查看源代码 common/util/CheckUtil.js, line 167

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

查看源代码 common/util/CheckUtil.js, line 528

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

查看源代码 common/util/CheckUtil.js, line 357

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

查看源代码 common/util/CheckUtil.js, line 261

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

查看源代码 common/util/CheckUtil.js, line 386

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

查看源代码 common/util/CheckUtil.js, line 84

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.

查看源代码 common/util/CheckUtil.js, line 108

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

查看源代码 common/util/CheckUtil.js, line 420

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

查看源代码 common/util/CheckUtil.js, line 191

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

查看源代码 common/util/CheckUtil.js, line 217

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

查看源代码 common/util/CheckUtil.js, line 242

Returns true if value is undefined, else false.

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

isUndefined(null)
// => false
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