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This article focuses on "how to return the constructor of all JavaScript variables", interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn how to return the constructor of all JavaScript variables.

Constructor attribute

The constructor property returns the constructor of all JavaScript variables.

Example

"John" .constructor / / returns the function String () {[native code]}

Constructor / / return function Number () {[native code]}

False.constructor / / return function Boolean () {[native code]}

Constructor / / return function Array () {[native code]}

{name:'John', age:34} .constructor / / return function Object () {[native code]}

New Date () .constructor / / returns the function Date () {[native code]}

Function () {} .constructor / / returns the function Function () {[native code]}

You can use the constructor property to see if the object is an array (including the string "Array"):

Example

Function isArray (myArray) {

Return myArray.constructor.toString () .indexOf ("Array") >-1

}

You can use the constructor property to see if the object is a date (including the string "Date"):

Example

Function isDate (myDate) {

Return myDate.constructor.toString () .indexOf ("Date") >-1

}

At this point, I believe you have a deeper understanding of "how to return the constructor of all JavaScript variables". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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