var foo = "11" +2+ "1"; Console.log (foo); 1121 Many articles the answer is wrong, I sent to the beginner's friends to see, in order to avoid the beginning to learn the wrong

Source: Internet
Author: User

Experience the difference between adding a string ' 1 ' and subtracting a string ' 1 '

1 var foo = "One" +2-"1"; 2 Console.log (foo);//111 3 console.log (typeof foo); Number

The result of the "11" +2 in the code above is that 112,type is a string, but-"1", which causes Foo to be converted into a numeric type for operation.

12console.log (foo);//11213 console.log (typeof foo); String

The + "1" is simply a concatenation of strings.

We suggest that you use the program to run a look,

var foo = "11" +2+ "1"; Console.log (foo); 1121 Many articles the answer is wrong, I sent to the beginner's friends to see, in order to avoid the beginning to learn the wrong

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.