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This article mainly introduces the relevant knowledge of "how to call JavaScript function". 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 call JavaScript function" can help you solve the problem.

Function:

Function classification: custom functions and system functions

Common system function

ParseInt ("string"): converts a string to an integer number

Example:

ParseInt ("86a") output is 86

ParseInt ("86a21") output is 86

ParseInt ("a86a") output to NaN

ParseFloat ("string"): converts a string to a floating point number

Example:

ParseFloat ("34.34") output as floating point value 34.34

IsNaN (): used to check whether it is non-numeric

IsNaN output false

IsNaN (true) output false

IsNaN ("true") output true

IsNaN ("aaa") output true

IsNaN ("111a") output true

Custom function 1, define function 2, call function

Function calls are generally used with form element events to call their format

Event name = "function name ()"

First, call no-parameter function

Example:

Function study () {for (var iTun0witi), that's all for "how to call a JavaScript function". Thank you for reading. If you want to know more about the industry, you can follow the industry information channel. The editor will update different knowledge points for you every day.

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