How to use strict mode in JavaScript
This article mainly introduces the relevant knowledge of "how to use strict mode in JavaScript". The editor shows you the operation process through an actual case. The operation method is simple, fast and practical. I hope this article "how to use strict mode in JavaScript" can help you solve the problem.
Declare a local scope within the function (strict mode is used only within the function):
Example
X = 3.14; / / do not report an error
MyFunction ()
Function myFunction () {
"use strict"
Y = 3.14; / / error (y not defined)
}
Why use strict mode:
Eliminate some unreasonable and imprecise aspects of Javascript syntax, and reduce some strange behaviors.
Eliminate some unsafe places in the running of the code and ensure the safety of the running of the code.
Improve compiler efficiency and increase running speed
Lay the groundwork for future new versions of Javascript.
"strict mode" reflects the more reasonable, secure and rigorous development direction of Javascript. Mainstream browsers, including IE10, have supported it, and many big projects have begun to embrace it in an all-round way.
On the other hand, the same code may have different results in "strict mode"; some statements that can be run in "normal mode" will not run in "strict mode". Mastering these contents will contribute to a more detailed and in-depth understanding of Javascript and make you a better programmer.
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